Tire width vs. coilovers

[Brigadir]

I’m switching from factory 19/9 wheels to 20/10.5 ET35. The rims (Aodhan AFF7) fit perfectly with the coilovers (ISC N1), leaving couple of millimeters between the rim edge and the strut. I’d like to know beforehand if tires will fit well, taking into account the strut nuts at the level of tire (as shown in the photos).
So, question to comrades who have done the similar wheels setup - should I expect any issues? Regarding tires, I’m thinking of 275/35/20, dedicating it for track usage

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[WItoTX]

Get slip on spacers, and if necessary, extended studs. You want your front track wider anyways. I think you can get away with up to a 5mm spacer on stock studs. Don't quote me on that though, do your own research.

Good luck!

 

[Brigadir]

Get slip on spacers, and if necessary, extended studs. You want your front track wider anyways. I think you can get away with up to a 5mm spacer on stock studs. Don't quote me on that though, do your own research.

Good luck!

Is your advice based on an actual experience with the similar setup?

 

[Need4SpeedMotors]

I’m switching from factory 19/9 wheels to 20/10.5 ET35. The rims (Aodhan AFF7) fit perfectly with the coilovers (ISC N1), leaving couple of millimeters between the rim edge and the strut. I’d like to know beforehand if tires will fit well, taking into account the strut nuts at the level of tire (as shown in the photos).
So, question to comrades who have done the similar wheels setup - should I expect any issues? Regarding tires, I’m thinking of 275/35/20, dedicating it for track usage

From the looks of it with a tire it will definitely rub. I have BC racing coilovers on my car and had a similar issue with clearance. The Bc coilovers come with camber plates on top, not sure if yours have them already or not. What I did to get max clearance was I bought bmr adjustable camber bolts and maxed them out to positive camber to get the most wheel to strut clearance. With the camber plates on top I adjusted my negative camber in so the wheel/tire wasn't rubbing on the fender. Two forms of camber adjustment.

 

[Brigadir]

From the looks of it with a tire it will definitely rub. I have BC racing coilovers on my car and had a similar issue with clearance. The Bc coilovers come with camber plates on top, not sure if yours have them already or not. What I did to get max clearance was I bought bmr adjustable camber bolts and maxed them out to positive camber to get the most wheel to strut clearance. With the camber plates on top I adjusted my negative camber in so the wheel/tire wasn't rubbing on the fender. Two forms of camber adjustment.

Thanks! In your case what was the rim and tire width?

 

[Need4SpeedMotors]

Thanks! In your case what was the rim and tire width?

I had 19x10 +35 with a 305/30/19 michelin pilot sport cup 2 up front, doing that gave me the extra clearance for the tire to clear the strut.

 

[NightmareMoon]

I had 19x10 +35 with a 305/30/19 michelin pilot sport cup 2 up front, doing that gave me the extra clearance for the tire to clear the strut.

I almost trust your eyeballs, but come on man, your example is completely apples to oranges. Literally every variable is different. Different coils, different wheel diameter, different wheel width, different tire, different aspect ratio, different tire tread width.

To the OP, you might be just fine or you might not be. Its hard to tell where that tire is going to sit relative to the spring perch. what's the height from the bead (not the edge of the rim) to the lower part of the spring perch? Usually a 275 ET 35 will clear most suspensions, but if you're lowered a lot with long springs and you're running a larger diameter tire (a 275/35/20 counts as larger) you could be in trouble.

Fixes: thin <= 5mm spacers, raise the ride height if you're dropped a lot (i.e. more than 3/4"), or camber bolts. You'd like to NOT reduce the camber with camber bolts if your goals are getting it on a road course.

 

[shogun32]

Get some 3mm and 5mm spacers. They are very cheap. And if you went all the bother of 10.5 wide, I'd be looking at 295 or 305 tires.

I believe you can go out to 7mm spacers on stock lugs but I would run open ended nuts to be sure and count the turns and paint mark them.

 

[Brigadir]

I almost trust your eyeballs, but come on man, your example is completely apples to oranges. Literally every variable is different. Different coils, different wheel diameter, different wheel width, different tire, different aspect ratio, different tire tread width.

To the OP, you might be just fine or you might not be. Its hard to tell where that tire is going to sit relative to the spring perch. what's the height from the bead (not the edge of the rim) to the lower part of the spring perch? Usually a 275 ET 35 will clear most suspensions, but if you're lowered a lot with long springs and you're running a larger diameter tire (a 275/35/20 counts as larger) you could be in trouble.

Fixes: thin <= 5mm spacers, raise the ride height if you're dropped a lot (i.e. more than 3/4"), or camber bolts. You'd like to NOT reduce the camber with camber bolts if your goals are getting it on a road course.

Thanks. Currently the car is in stock height. I can get a little more vertical space by moving up the two upper nuts on the strut, that will preload the spring but will keep the ride height as is. If I lower the car, all the nuts move down which will limits the space. In that case spacers would be more necessary. Interesting if there are spacers that already have different inner and outer hub bore (70.6mm of the car's hub to 73.1mm of the rims central hole).

Also I noticed that different tires have various amount of side rubber ahead or the rim edge (at least from outer side). But I haven't investigated which tires are narrower/thicker yet...

 

[shogun32]

if there are spacers that already have different inner and outer hub bore (70.6mm of the car's hub to 73.1mm of the rims central hole

Absolutely. But they are 13mm thick and more. For rather less than that just use a concentric'ish bore spacer and add concentric rings.

Depending on how much tube is inserted into the holder you can loosen that lower ring and thread the tube in and out to effect ride height at rest. You generally want at least 40mm of tube inserted.

 

[Brigadir]

I’ve tried this setup that I asked about, so sharing here the answer.

The tires fit excellent. The smallest gap between the coilover and the wheel is to the rim’s edge. Because 275 tire is narrower than the rim, the is no issue touching the coilover nuts. In my case the tire is Hankook Ventus V12 Evo2

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