I am looking to get 18x10 with a +42 offset C
Was wondering if this will fit with the stock suspension setup on a r1 or if i need 2.5 coilovers?

 

The latter.

 

I have 18x10's in the back w/ a 42mm offset....but I am running the TEIN Flex coilovers...feels like there is still quite a bit of room behind the wheel, but I have never tried my wheels on a stock suspensioned FD.

 

Lane_change, have you rolled your rear fenders? do you have problems rubbing on the fender?

 

nope....everything fits fine, no rubbing, rolling, etc..

 

BTW, Mr. lane_change, are you running aftermarket toe links/trailing arms too?

 

I don't think you need small-diameter-spring-coil-overs to run 18x10" +42 in the rear. You might catch the fender lip with the tire, though. You might need to roll or cut the fender lip, run more negative camber, or use a more narrow or round-profile tire to avoid rubbing. Or it might just work as-is -- I'm just giving you some options for things to try if you do find that it rubs.

-Max

 

As far as I know they are stock.....I was not told if I had aftermarket parts when I bought it, and I know I haven't put them on it yet...I will have to check when I get the car back from the body shop though.

 

its good to know that I don't have to roll fennders for 18x10

 

My 18x10" +50mm offset wheels with 285/30-18 tires are pretty close. I don't think there is 8mm (the difference in our offsets) of clearance between the inside of the lip and the tire. You might need to cut or roll, depending on tire sidewall (how round/square?) and alignment (camber?).

-Max

 

18x10's are fine...i'm running a 285, so when I decide to slam the car I will roll the fenders...

 

I'm running 18x10 +42's with a 275/35 tire. No special equipment, or rolling required.

 

It might be my tires. The 285s that I have (BFG R1a DOT-R track tires) are very square.

-Max

 

I ran on those briefly a while back and I caught the front fenders lips a couple times with just a 225/50/16!

 

T1-S are a very round-shouldered tire, but it sdoes have significant rim protector bars that stick out well past the rim lip.... so your results may vary. It is close. However, you can't go on looks. Mine looks for all the world like it'll rub but doesn't... I don't know how much more you could push that.

 

I am running 285-30(35?)-18 Bridgestone Potenza S-02 PP's.

 

They should work fine. My friend had 18x10 with a +45mm offset with only racing beat lowering springs. He had no problems at all. So a +42mm offset should work fine. And, he ran 285's on them.

 

Your logic is flawed, a +42 offset is a WORSE fitment than a +45 offset!

 

Sounds like it should be fine with the stock equipment. I am going to run a 275/35/18 and 255/35/18 for tires.

 

I am also want to get a 18x9 in the front with a +41 offset B.

 

They'll fit , but close to the limit on stock fender lips (I've seen 18x10 +41 work with 285-30-18). Fronts are okay too.

Gene

 

I planned on running 295s on 10 inch rims. After reading all of this I guess I need to stick with the 30 profile, not the 35. Too bad since there are more tires available in the 35 ratio I like.

 

That depends on whether you're talking about the front or the back of the wheel. +45mm is better for clearance with the fender lip, but would require coilovers and possibly aftermarket trailing arms for clearance in the back with a 10" wheel, not that a +42mm offset wouldn't also.


18 x 10", +42mm offset

10" = bead to bead, +1" = 11" overall wheel width
11" / 2 = 5.5" wheel centerline
+42mm / 25.4 = +1.65" offset
5.5" + 1.65" = 7.15" back spacing
11" - 7.15" = 3.85" front spacing

Maximum front spacing in the rear is about 4.0", so you have a little clearance there. Maximum back spacing is about 7.0" with stock diameter springs, so the Tein coilovers he has are probably necessary for adequate clearance.


18 x 10", +45mm offset

+45mm / 25.4 = +1.77" offset
5.5" + 1.77" = 7.27" back spacing, which is even worse as far as stock springs are concerned
11" - 7.27" = 3.73" front spacing, which gives more clearance in the front

 

Do not use 295s on a 10 inch rim. An 11 or 12 inch wide wheel is recommended. I've 295-30-18 Pirelli PZero Rosso Asymetricos on the rear of my FD. A decent tire, but seem to run larger width than what is provided in their specs, e.g., they are identical in width to a 305-30 Hoosier!

Gene

 

Hmm...lots of people running 10" wide wheels in the rear with stock trailing arms and springs. My 9.5" +45 offset have a LOT of clearance to the trailing arm and spring. A 10" +45 offset (in 18" anyway) should fit fine with regards to the trailing arm and springs. I can see how a 10" in a 17" might be more problematic.