Dan00313

Does anyone run this setup, and or have any idea if the offset is do-able without fender mods. I will be dropped on tein SS coils, but no camber plates. I prefer to run a 245 vs a 235 tire as I do not like the stretched look. If anyone has any pictures of this setup or any insight I'd appreciate it. Please include your suspension (coilover vs, springs), camber, tire size & fender modifications.

09TSXTech

Tire size is not a problem, just 0.8% difference compare with stock.

Your 18 x 9 ET 30 w/ 245 tires package will stick out 35 mm (1.4'') farther than stock, grab a tape measure and ruler to check on clearance.

Simba91102

Actually, they'll stick out an extra 44MM. Half the extra wheel width (19MM), plus ALL of the decrease in offset (25MM). So...... 25+19 = 44MM.

Dan00313

Exactly, which is why I was curious if anyone was running a similar wheel/tire combo. I feel it may stick out further then I would prefer. Rolling fenders is fine, but I don't want to run -3+ degrees of camber to make it work.

09TSXTech

Defconskylude has posted a thread with the virtual offset calculator which I have found to be very useful. http://www.rimsntires.com/rt_specs.jsp

Our stock rim is 17 x 7.5, ET+55, tire 225/50/17

So your rim will be 44mm wider but according to the calculator, the tire and wheel package will stick out 35mm farther out.

Simba91102

It's the combination of extra width and decrease in offset that counts. If you could draw a hypothetical straight line perpendicular to the hub, as I stated above half of the extra wheel width would be inside the hub face if the offest was the same as OE (or inside the straight line, in this case 19mm), and the other 19mm plus the decrease in offset (25mm)(44mm total) would be to the outside of the hub face (or to the outside of the straight line). The link didn't work for me, but I've been dealing with tires and wheels for along time and I think if it were my car, I'd go with my math. Of course it helps if someone was there first and is already running this set up.

SilverCU3

Tech is right. Definitive answer in this case is that the outer sidewall of a 245 section tyre mounted on a 30mm offset rim will protrude an additional 35mm over a 225 section tyre on a 55mm offset rim.

The math goes as follows:

Outer edge of sidewall relative to hub mounting face = nominated tyre width divided by 2, minus offset (width/2 - offset)

The actual width of the rim is largely academic as the tyre width will stay constant until fitted to a rim width quite a lot greater than that mentioned.

Of course, it has to be remembered that the tyre widths stated are nominal and every tyre manufacturer's product will vary slightly in width. So allow some tolerance when relying on a tape measure to determine dimensions.

Prototype

FYI, a friend of mine let me test fit his 18x9 +35 volk ce28n's (255/35r18). They fit very well, disregarding the tire size. I think we can go 10in wide on a +35 offset and not have any issues. Obviously some negative camber and a fender roll would be in order.