Why you should get 255/40-17 tires for your OEM rims !!!

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Old 12-16-2012, 11:20 AM
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TPMS Question

Got a question for everyone:

I put 255's on and love them so far. They do just fine in the snow and ice, much better than the old bald ones did .

I adhered to Inaccurate's suggested 35 psi front and 30 psi rear. The last couple days the TPMS has been giving me a warning on the back tires, which I assumed was the result of the colder weather. IIRC, it's saying 27 or 28 in the rear. I checked yesterday with a real guage and all tires are still at the 35 or 30, respectively, so my TPMS is low by a couple PSI on all tires. Anyone have any ideas what the reason for this is? Do the sensors go bad over time? I don't see how it could be a result of the different sized tires, 30 psi is 30 psi, regardless of the width of the tire.

Thanks for any input.
Old 12-26-2012, 07:41 PM
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hello, I have joined you guys in the oem 255/40/17 crew!

bought them size in hankook v12 !

I had to go to another america's tire to get them because they will not sell me "out of spec" tires... but I've read this entire thread and side threads that 255/40/17 will indeed fit

Last edited by DC2many; 12-26-2012 at 07:46 PM.
Old 12-29-2012, 02:49 PM
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Here's a proper posting, couldn't delete previous one...



255/40/17 seem to fit extremely well on the x8 oem wheels, it even looks to be an oem optional size.

Less than 100 miles driven but I can agree with what customers and magazines said (was reading until I was able to get an appointment)

Braking feels phenomenal, it's as if the tires are ripping itself into the floor to stop even with the slightest brake pressure
I can feel shift transitions somewhat being "slow" but predictable and can be sensed if paying attention
Side wall is somewhat soft, not sure if bad. I have 36-38 psi front cold 33-36 psi cold rear
Accelerating seems easier, shifting at the lower range seems easier and has less/none of the 6MT shift bouncing bull shit @ all ranges (my motor mounts could be too old as well)
Once hugging the turn it'll keep at it

Wheel wells seems filled in much better, was thinking about 15mm 20mm spacers front and rear but not sure if possible now.. I still want to be behind the fenders slightly so I know I won't have to rub on a regular commute... Previous set up rubbed and having to take even more precautions on top of precautions already taken just didn't want to

hopefully it'll stay this way for the rest of it's life

Last edited by DC2many; 12-29-2012 at 02:55 PM.
Old 12-29-2012, 07:17 PM
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Originally Posted by DC2many

Wheel wells seems filled in much better, was thinking about 15mm 20mm spacers front and rear but not sure if possible now..
I realize I'm negative at times, but how can the wheel wells be filled in much better when the 255 tires are smaller in diamater than the OE tires, 25" vs. 25.9"?
Old 12-29-2012, 08:36 PM
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^ Visually
Old 12-30-2012, 06:25 AM
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Originally Posted by DC2many
^ Visually
???????????????
Visually a smaller diameter tire looks bigger............I see.
Old 12-30-2012, 01:56 PM
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^yes... I still have not aligned my car yet so we will base it off current scenario

I have -2 Front -2.5 Rear

With the oem 235/45/17 I have so much damn room that I can run spacers 15-20mm in front and 20-25mm in rear and be barely right behind the fender (Common sizes to run for most people on here w/ oem wheel & oem tire size)

If I were to do the same with the current 255/40/17 I'd be chopping up my fenders as they'd actually stick out with that amount of spacer
Old 12-30-2012, 02:03 PM
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Very nice
Old 12-30-2012, 02:46 PM
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Originally Posted by DC2many
^yes... I still have not aligned my car yet so we will base it off current scenario

I have -2 Front -2.5 Rear

With the oem 235/45/17 I have so much damn room that I can run spacers 15-20mm in front and 20-25mm in rear and be barely right behind the fender (Common sizes to run for most people on here w/ oem wheel & oem tire size)

If I were to do the same with the current 255/40/17 I'd be chopping up my fenders as they'd actually stick out with that amount of spacer
Comparing summer tires, if you do some research you'll find that the V12 has a small tread width of only 8.7" in the 255 width as most 235 summer tires come in at 8.5" and the 255 is less than most 245.

If people are interested in the 255/40-17, look into the Continental RE760 Sport as the tread width is a nice 9.3". Still only 25" in diameter but a great treadwidth.
Old 12-30-2012, 02:55 PM
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Originally Posted by Turbonut
I realize I'm negative at times, but how can the wheel wells be filled in much better when the 255 tires are smaller in diamater than the OE tires, 25" vs. 25.9"?
Filling in the space where the spacers would fill in, If that make any sence lol. Since the tires will stick out 10mm more than the stockers we don't need to run the 15mm-20mm spacers to get rid of the sunk in look.

That lead me to another question... Anyone here with the 255 AND spacers? I want to run 5mm front and 10mm rear but don't want to spent the money lol. I have 2 sets of 15mm and want to throw them on to see how they fit.
Old 12-30-2012, 04:07 PM
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Originally Posted by luder917
Filling in the space where the spacers would fill in, If that make any sence lol. Since the tires will stick out 10mm more than the stockers we don't need to run the 15mm-20mm spacers to get rid of the sunk in look.
Sorry it doesn't make any sense as 25" is 25" and the OE tires are almost 3/4" larger in diameter and moving the tire outward won't fill in the top of the wheelwell nor give any different visual appearance when looking at the side from afar.
Old 12-31-2012, 04:29 AM
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Originally Posted by Turbonut
If people are interested in the 255/40-17, look into the Continental RE760 Sport as the tread width is a nice 9.3". Still only 25" in diameter but a great treadwidth.

Do you mean the Bridgestone Potenza RE760? Not Continental right?
Old 12-31-2012, 07:04 AM
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Originally Posted by Syms
Do you mean the Bridgestone Potenza RE760? Not Continental right?
Yup, Bridgestone. The Continental DW is a great tire, but not certain as to the tread width as it's not listed.
Old 01-09-2013, 08:03 AM
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Great thread I plan on going with the 255/40/17 setup also.
Old 01-09-2013, 08:26 AM
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Originally Posted by Turbonut
Sorry it doesn't make any sense as 25" is 25" and the OE tires are almost 3/4" larger in diameter and moving the tire outward won't fill in the top of the wheelwell nor give any different visual appearance when looking at the side from afar.
I think there's two perscpectives of "filling in" going on here. Turbo I think DC was talking about filling laterally and not vertically. I'm with you on the real world diameter comparison, but it looks like DC has a drop from his pics and he liked how the tires "filled in" the width of the wheel wells. Hence, his decision to not add spacers to his setup.

Of course I could be wrong, lol.
Old 02-22-2013, 09:11 PM
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Originally Posted by luder917
That lead me to another question... Anyone here with the 255 AND spacers? I want to run 5mm front and 10mm rear but don't want to spent the money lol. I have 2 sets of 15mm and want to throw them on to see how they fit.
I would also like to know this, mainly if I add TienSA coils and drop it maybe 2"

If I understand things, stock wheels are 17"x8" +45mm with tires at 235mm/45mm/17", you can add from 15-20f, 20-25r to get a "flush" look. Adding spacers basically subtracks offset. So 15mm for the front will give you +30 offset, and 20mm for the rear will give you +25 offset.

With the above in mind, if you go from a 235mm tire to a 255mm in tire, that's basically adding 10mm to each side of the wheel (255-235=20/2=10). And I think what most concerns us is the rubbing on the outside lip of the fender. So, this is kind of like adding a 10mm spacer.

It's already been established that 255mm width tires with stock setup clears without issue. Also established with 235mm width tires and stock setup, adding 15/20 spacers to front/rear is clear of problems too.

If I can do math at all, to get the equivalent result of adding 15/20 spacers with 235mm tires on the 255mm setup would be 5/10mm spacer on the front/rear.

Check out this site, it's got an awesome wheel/tire calculator

http://www.rimsntires.com/specs.jsp

Last edited by Shoeface; 02-22-2013 at 09:16 PM.
Old 02-23-2013, 05:58 PM
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Originally Posted by Shoeface
I would also like to know this, mainly if I add TienSA coils and drop it maybe 2"
http://www.rimsntires.com/specs.jsp
I'm running 255's with 20mm rear and 15mm front spacers. Car is also dropped about 2" or so with Tein SA coils. With this setup there will be some minor rubbing on speed bumps and big dips. The fenders will need to be rolled but it's an easy job with a fender roller tool.

The car is a lot more aggressive and sporty looking. It also corners and handles like a beast which is a lot of fun . I have the dampers set at medium so it's still very comfortable to drive and it's not slammed so low that I have to worry about every little bump and dip in the road.

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Old 02-23-2013, 06:57 PM
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Originally Posted by Gregerst
I'm running 255's with 20mm rear and 15mm front spacers. Car is also dropped about 2" or so with Tein SA coils. With this setup there will be some minor rubbing on speed bumps and big dips. The fenders will need to be rolled but it's an easy job with a fender roller tool.

The car is a lot more aggressive and sporty looking. It also corners and handles like a beast which is a lot of fun . I have the dampers set at medium so it's still very comfortable to drive and it's not slammed so low that I have to worry about every little bump and dip in the road.
Cool man, thanks for the info! I'm for sure getting the Tien SAs, but if I get 255's, I'll probably just go with 5/10mm spacers. I'm thinking even 245's with 10/15mm spacers. We'll see!
Old 02-23-2013, 08:11 PM
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Originally Posted by Shoeface
Cool man, thanks for the info! I'm for sure getting the Tien SAs, but if I get 255's, I'll probably just go with 5/10mm spacers. I'm thinking even 245's with 10/15mm spacers. We'll see!
I would try to get as flush as you can. It'll look a lot better when you're lowered. I have the conti DWS's which run a little narrower than some of the other brands I've seen 10 f 15 r will clear the fenders without rolling but it would still have a little bit of that sunken in look.
Old 03-05-2013, 02:11 PM
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Hi guys im buying a set of DWS in the next 2 months. Does anyone have the 255 40's on stock base 07 rims?
Old 03-05-2013, 02:25 PM
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^sure.
kinda pointless if you dont ask your full question.
Old 03-06-2013, 12:39 PM
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Originally Posted by justnspace
^sure.
kinda pointless if you dont ask your full question.
Im wondering if they fit without a problem on stock 07 base rims.
Old 03-06-2013, 12:47 PM
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^ yesterday, I did go through the thread a little and did a ctrl+F to find certain words.
I found that the DWS is a little narrow compared to the rest, but they should fit.

if i have more time today, i'll finish searching for DWS
Old 03-06-2013, 01:22 PM
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Well dont waste your time I did a Search this Thread and didnt find much on DWS. Im about to buy 4 255 DWS right now http://www.1010tires.com/ has a free shipping deal for Canadians right now.. I cant pass it up.
I will try to post some pics here once I get them installed.
Old 03-06-2013, 01:34 PM
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See pics of my car a few posts above. I'm running DWS's 255/40/17 on stock type-s rims which are the exact same size as base rims.
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Old 03-06-2013, 02:28 PM
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Just a little worried that the rim width range of the dws 255 is 8.5-10 andwe are running 8 on stock rims.
Old 03-06-2013, 02:30 PM
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Originally Posted by Inaccurate
Inaccurate's "Top Ten List"
As to Why You Should Get 255/40-17 Tires
for your OEM rims.

(please note this is 255/40 not 245/45.)

10) Lower effective gear ratio
9) Increased braking force per given pressure on brake pedal
8) Slightly lower stance (estimating 1/4 inch)
7) Great rim protection without being excessive
6) With the 255 tires, TL now looks even more like a BMW
5) You will be less envious of others having A-Spec
4) Having wider tires than a G35
3) Car feels lighter (accelerates easier, brakes easier, more responsive steering)
2) Don't need to stay 10-feet away from the nearest curb anymore
1) TL now looks plain 'ol "mean" as heck



I got the Goodyear Eagle F1 (D3) tires. Up to this time, I was running the OEM Bridgestone Turanza EL42. I really LOVE the way the TL now looks with these wide tires. And, BTW my age is the middle 40's. I include this to give some insight into my taste. I have always loved the way BMW's looked with their OEM wide tires. So, now I have that BMW'ish look with my TL.

At first, I was aiming to upgrade to just the 245/45 tires. No one here on the forum had ever mentioned using the 255 tires, so I thought the 255 would be too much and "out of the question".

However, when I was searching the forum, I did find one thread in which a single person did install the 255's. He even included pictures. His TL in the photo LOOKED GREAT with the 255's on the OEM rim.

That was it for me. I then planned to get the 255's after seeing this one person's pictures. I was scared to make this $1200 decision without anyone else to "back up" this one person that had installed 255's on the OEM rims. But, on the bright, there was no one on the forum saying that they tried the 255's and had problems.

So, let me be the second person on the forum to say "GET THE 255/40 !!!!". Skip the 245/45. Go with the 255/40.

There is absolutely no rubbing issues. It is NOT even close to rubbing. I turned the wheel and viewed the clearance in the wheelwell --> Huge clearance.

Because the 255/40 is a half inch shorter in diameter than the OEM 235/45, the tire fills-up less of the wheel opening. To me, there is not excessive open space with the 255/40, and I somewhat prefer the slight increase open space. But, actually, this is very minor and (to me at least) not even really noticeable.

But, the increase in tire width is VERY NOTICEABLE !!!!!!! If you like the way BMW's look with their OEM wide tires, you will LOVE this upgrade.

I weighted the OEM wheel (oem rim with oem tire mounted). The OEM wheel is 51.0 lbs (bathroom scale = +/- 0.5 lb.). The oem rim with Eagle F1 255/40-17 tires weigh 53.0. So, the wider tire is 2.0 pounds heavier. This is a 4% increase.

For performance, look at it this way. The mass increase from the wider tires is probably offset by the smaller diameter of the wider tires. In physics, there is a thing called "angular momentum" - I think that is the term for it. This means that if you have two wheels that weigh the same, but with different diameters, the smaller diameter wheel will gain/lose RPM easier than the larger diameter wheel.

Changing topics now to the tire brand selection. A nice feature of the Eagle F1 is what Goodyear calls it's "Rim Protector". This feature just means that the bead area on the tire where the rim seals against the tire is VERY GREATLY recessed more than usual. So, this helps to make the wide 255 tire to fit on the our TL OEM rim because the tire width across the beading area is less than normal for other brands. DISCLAIMER - This is only speculation as I have not actually compared other brands by measuring the width across the beads.

So, you ask me what I think of the 255 upgrade. Just check the ten items listed above. I really do mean those ten items. I really do notice that my brakes seem more powerful during normal everyday usage. I do notice the engine picking-up RPM slightly quicker than before from the lower effective gear ratio.

You ask where are the pics ? I will try to get some pictures posted sometime this weekend.

Did the wider tires make my steering wheel feel heavier ? NO. The steering actually feels a bit lighter. Why ? I don't know why the steering is lighter than it was with the OEM tires. Stiffer sidewalls (from lower sectional profile) perhaps.

How does the car handle ? I can't answer this because I am not the type that corners aggressively. I will say that I feel a slightly improve steering response. Stiffer sidewalls (from lower sectional profile) perhaps.

Is there more road noise ? Not that I can hear or feel. I have driven the 255's on concrete freeway at 70 mph, and I could not hear any difference than with the OEM Bridgestone Turanza EL42. However, in general, the Eagle F1 does have a different sound (not noisier, just different). Driving around town (stop-n-go, 35 mph stuff), the tire has a "ting" sound similar to a ball that has excessive pressure (the tires had 35 psi) when driving over raised irregularities in the road (uneven joints in the road). I like the way the Eagle F1 sounds.

Does the 255/40 stickout too much (in a figurative and literal sense) ? NO. Although the wide tires are a very noticeable difference, a person that never seen a TL before would think that it was a factory design. The 255/40 on the oem rim has a very clean appearance and fits perfectly.

How much is the speedometer affected ? Too soon to say. I have had the 255's for only two days now. But, so far, the speedometer error has not caused me to notice the small difference in mph. But, on the bright side, remember the error will be having a higher indicated mph than the actual mph. So, you are going slower than the speedometer indicates. So, no speeding tickets that you can blame on the error.

Is the mpg affected ? Too soon to say. I have had the 255's for only two days now.

Does the 255 width increase hydroplaning tendencies ? I am unable to make a blanket statement because I am using the Eagle F1, which has PHENOMENAL wet performance according to the research that I did. On my morning commute this morning, there was heavy to medium thunderstorms. I did appox 10 miles at 60 mph thru moderate puddling (long stretch of standing water) while still raining moderately. Also, I went thru average puddling while still raining moderately along city streets at 40 mph. So, I am trying to say that my commute is half city streets (35 mph rated and doing 40 to 50 mph) and half concrete freeway doing 60 mph. The Eagle F1's were noticeable different than any other tire I ever used. When going thru puddling, even on the freeway at 60 mph, there was no splash sounds as normal tires make when pushing the water out of the way. The Eagle F1 made no sounds thru the puddles. Plus, there was no tugging at the steering wheel when encountering puddles; other tires usualy cause a tug on the wheel whening hitting puddles hard. The thing that I noticed the most was that I could not hear the wet roads. The Eagle F1 made the same sound and had the same feel in the rain that it does in the dry. To me, this indicates that these tires are really different. Other tires make splashing sounds, and you can feel the tire pushing water out of the way. With the Eagle F1, the tires seems to cut thru the water like a knife. (Sorry, I got off topic of the 255 width and I turned into a advertisement for Eagle F1's.)

Why did I get the 255's ? Because I did not like the way the OEM wheels looked and to gain curb protection. What were the engineers thinking ??? Those 235's are way too narrow for that 8 inch rim. Perhaps, they intended for us to upgrade to 255's so the car would look more like a BMW. With all the other styling that they "borrowed" from the BMW body style, I think they wanted to include the wide tires too but the marketing department made them use 235's to keep cost down. I say this jokingly, but who knows --- might be some truth in it.

Back to Why did I get the 255's ? The 255/40 DEFINITELY achieved both of my goals. My TL now looks much better (VERY NOTICEABLE !!!) with the wide tires, and I LOVE THE BMW'ish LOOK that it now has. The second goal was to gain some curb protection. With the 255/40, this goal too has DEFINITELY been achieved. I am very happy that I got the 255's instead of the 245's.
Many thanks for the perspective and the information. I am going to try this on my 2007 TL. Like you have always liked the BMW stance and youhave convinced me.
Old 03-06-2013, 02:56 PM
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Screw it.. I just bought four 255/40/17 Conti DWS from 1010tires.com
Old 03-06-2013, 03:08 PM
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Originally Posted by Thunderrr
Just a little worried that the rim width range of the dws 255 is 8.5-10 andwe are running 8 on stock rims.
IIRC Team Honda's Acura TL that ran Thunderhill was using 255/40/17 Toyo RA1 tires on stock width rims. Those tires are rated for 8.5 minimum as well. Bottom line don't sweat it.


Last edited by Gregerst; 03-06-2013 at 03:11 PM.
Old 03-13-2013, 01:11 PM
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Quick question. I have 8.25" width rims, could I safely run 265's since the stock rims will run 255's? And also, do they make a taller tire in 255, or only 40's?
Old 03-13-2013, 03:00 PM
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I've been noticing that the inside of the tires wear out quicker. I've had the car aligned several times and the issue is still there. Never came across it with the OEM size. Anyone else experience similar issues?
Old 03-13-2013, 03:14 PM
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post up alignment specs.
your toe is out.

which causes camber wear.
Old 03-13-2013, 03:18 PM
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I'll grab it
Old 03-13-2013, 06:34 PM
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Justin-can you Post some close up pics of your Current Star Specs in the 255/40/17?
Old 03-13-2013, 06:55 PM
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Originally Posted by justnspace
post up alignment specs.
your toe is out.

which causes camber wear.
No it causes wear because the toe is out ... BUT more critical on cars with excessive camber. Combination of the 2.


And added to the wider tire there is more pressure put on the inner side of the tire.

When you start putting wider or narrower tires on rims not suited you do all kinds of funny things to the tread footprint that a lot of times can't be corrected by tire pressure.
Old 03-13-2013, 07:24 PM
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Originally Posted by Mrtastygoody
Quick question. I have 8.25" width rims, could I safely run 265's since the stock rims will run 255's? And also, do they make a taller tire in 255, or only 40's?
It will work and it should work with no "weird" issues but you're adding 10mm to the width of the tire and only .25" to the rim. Since measured tread widths vary you could look for a 265 that runs narrow and a 265/40 will be about 4mm taller vs a 255/40. I mention this because it sounds like you might want slightly more sidewall.
Old 03-13-2013, 07:33 PM
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Inside edge wear is only because of camber. Too much toe wears the tires quicker so it makes inside edge wear quicker. As a Honda master tech said, every Honda product will have inside edge wear if the tires are left in the same position long enough. Usually when people go wider they're going softer as well so that makes the problem worse.

Toe can make the leading edge wear quicker which if its toe out it would be the inside edge but if there was no camber problem a toe problem would wear the while tire quicker, almost evenly.

I've found that driving down the freeway mostly will help accelerate the edge wear. Driving "spiritedly" seems to give more even wear.

I'm leaving out details because I'm on my phone so I'll probably be called out on that.
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justnspace (03-13-2013)
Old 03-13-2013, 11:33 PM
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this is pretty much right as i put them on.



255/40/17 Dunlop Direzza Star Spec Z1
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Slpr04UA6 (03-14-2013)
Old 03-14-2013, 12:41 AM
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Originally Posted by justnspace
this is pretty much right as i put them on.



255/40/17 Dunlop Direzza Star Spec Z1
Could you give a brief comparison to the NT05 particularly in cool (pre warm up) traction and noise? Thanks.
Old 03-14-2013, 04:52 AM
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forgive my lack of vocabulary describing tires.

this is my first car that I'm modding.
and I'm sure I did not maintain my NT05s properly.
I over inflated them just a little; as they warmed up they reached about 37psi.
I think you found traction was best at 35-36. and since it's a play car(Garage Queen), I never really experimented that much with tire pressure.

I have found that the NT05 took forever to warmup!!!
I would skid to stop signs at 35mph when cold! lol
or at least get that ABS pulse.


Not so much with the Star SPecs Z1.
when cold, i still have enough traction to stop at stop signs at 35mph.
and I'm gonna end this short because I'm on my way to new york.
see ya fellas.


Quick Reply: Why you should get 255/40-17 tires for your OEM rims !!!



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