265/40 for 20 inch rims

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Old 06-30-2019, 01:10 PM
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265/40 for 20 inch rims

Looking to get some aftermarket 20 inch rims, was considering getting a bigger tire size, 265 instead of 255. Anyone had any luck with a bigger size?
Old 07-01-2019, 11:40 AM
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Wouldn't that screw up your odometer and indicated speed?
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Old 07-01-2019, 11:49 AM
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always use an online tire calculator.
my favorite one is https://www.1010tires.com/Tools/Tire-Size-Calculator

the stock rolling diameter for the RDX is; 29.18"
the proposed tire rolling diameter is 28.35"

the proposed tire IS within the 3% variance, although cutting it close. it is OKAY to run this tire.
speedometer will be 2.93% too fast

the ultimate goal is to KEEP the same rolling diameter as stock.
Old 07-02-2019, 06:27 AM
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Check your speedometer first, mine is already faster: setting my cruise control on 65mph gets me a GPS speed of 66.
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Old 07-02-2019, 09:11 AM
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Originally Posted by desmedt
Check your speedometer first, mine is already faster: setting my cruise control on 65mph gets me a GPS speed of 66.
of course, that's why maintaining stock rolling diameter is SO IMPORTANT.
Old 07-02-2019, 11:23 AM
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You would need 265/45/20 rather than 265/40/20.
The variance is only +0.7%.
Stock is 255/45/20.
At least one owner posted that he was running Michelin Pilot A/S 3+ sized 265/45/20 with no problems.
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Old 07-02-2019, 11:24 AM
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^great job on checking the other sizes, which I didnt do.
Old 07-03-2019, 09:40 PM
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As posted here, I am running 265/45/20 Michelin PilotSport 3 AS+ and I see no difference between the indicated speed in the cruise control and WAZE to be the same throughout the normal highway speeds...our prima fasciae speed limit on the local state freeway seems to be 80.
Old 07-05-2019, 11:29 PM
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Originally Posted by Padre Dave
As posted here, I am running 265/45/20 Michelin PilotSport 3 AS+ and I see no difference between the indicated speed in the cruise control and WAZE to be the same throughout the normal highway speeds...our prima fasciae speed limit on the local state freeway seems to be 80.

Dave how do you like the pilot sport tires? Looking for some all season tires to get. How is the road noise?
Old 07-06-2019, 12:16 AM
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Well... On the bright side you'd have endless grip!
Old 07-06-2019, 11:25 PM
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Originally Posted by Anthonyc1
Dave how do you like the pilot sport tires? Looking for some all season tires to get. How is the road noise?
I really like them a lot. Very quiet! Michelin's always run smooth, and this is really the balance between sport and long tread life. The PS4's are amazing but so soft that you run them down because you can't help it!

Arizona doesn't really have much in the way of traditional "all seasons" at least in the Phoenix area. I have a set of the same PS 3 AS+ on my Mazdaspeed 3 too. I can't tell if they are quiet because my exhaust is too loud, but they sure do run smooth!
Old 08-08-2019, 04:35 PM
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What is the offset of the stock oem 19"? 19x8, XX+?
Old 11-08-2019, 09:03 AM
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replacing 255/45/20 with 235/55/20 snow tires

I posted this elsewhere but want to do one final check.. Running 255/45/20 stock tires on my 2020 A-Spec. I have a set of 235/55/20 winter tires from a previous car and in checking the online calculator, it shows that there is just under a 4% variance in the diameter and the speedo would be slightly off (3.8% slower). I don't care about this and am told that the tires should fit in the wheel wells no problem as they are just slightly taller but also narrower.

My understanding is that you should be within a 3% variance and these tires are just outside of that. Want to make sure that none of the systems will go haywire - TCS, ABS, etc...

I want to make use of these tires as they are sitting in my garage and are in good condition.

Thanks

Old 11-09-2019, 06:20 PM
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Originally Posted by konyo1
I posted this elsewhere but want to do one final check.. Running 255/45/20 stock tires on my 2020 A-Spec. I have a set of 235/55/20 winter tires from a previous car and in checking the online calculator, it shows that there is just under a 4% variance in the diameter and the speedo would be slightly off (3.8% slower). I don't care about this and am told that the tires should fit in the wheel wells no problem as they are just slightly taller but also narrower.

My understanding is that you should be within a 3% variance and these tires are just outside of that. Want to make sure that none of the systems will go haywire - TCS, ABS, etc...

I want to make use of these tires as they are sitting in my garage and are in good condition.

Thanks
should be no issues, other than Speedo. However, you still may encounter some of those lights. Not likely tho but have to throw out the disclaimer.
Old 11-19-2019, 02:44 PM
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Just remember, when the speedo is off so is your odometer... with a smaller diameter wheel your odometer will end up showing more miles than your are driving. This goes in reverse when using a larger diameter wheel.
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