i think a 10.5" wheel is too narrow for the 285 bfg. it needs an 11" minimum but would probably even better on an 11.5. i think an A6 in 315 also needs an 11.5" wheel.

i found these and they look quite interesting. completely custom offsets available and CHEAP!

http://www.vorshlag.com/product_info...roducts_id=601

i'd probably go baller and get some 12's.

 

Wow, Ive been looking for a source of 18x11s without going to CCWs. Now if I could just figure out how to fit a BFG on a 12" rim to fitt under the rear fenders..

 

I am hungover today but tomorrow I'll try to get more measurements to be more accurate. That Forgestar find is perfect. Is there any information on wheel weights? How do they hold up to racing?

preliminary... 18x11 will work.

18x12... you are going to need to do some fender work and a reduction in offset. 18x12 ~+30ish with 2/3" fender pull. The forgestars don't come in that low of an offset for the 18x12s but you can always throw a 5mm spacer on the rear. Large spacer up front.

 

this is the only info i've found.
http://www.forgestar.com/v2/testdata.php

Haven't seen any weights though. Vorshlag lists the shipping weight of their 18x10 wheels at 25lbs (including shipping box and padding)
http://www.vorshlag.com/product_info...roducts_id=521
So they appear to be similar in weight to CCW's or Enkie wheels of similar size.


I also found an alternate 18x10.5 +30 wheels (not the usual Nto3's). some TE37 knockoffs and Ce28N knockoffs that are apparently ~1k per set.
http://varrstoen.com/products/

Maybe Psushoe can pop in here and tell us how 'easy' it was to fit the rota 18x12+20 P45r's with 315 A6's on his SM evo.
http://www.racinglab.com/rota-p45r2-18x12-001.html

 

Did some measuring today and was quite surprised with what I found. Notably, I have a lot of room to the R/TErnie trailing link from my tire/wheel. Less space to the coilover spring.

tire to spring at rest: 20.5mm
tire to spring at full droop: 18.5mm (worst case scenario)

rim to trailing link at rest: 34mm
rim to tariling arm at full droop: 25mm (worst case scenario)

I have update my spreadsheet and my current "fender space" runs out to ~300mm where my limitations on the inside are the size of the coilover spring (6.5mm more than I had originally guesstimated). The fenders have only been rolled at this point.

 

On the test notes for the 18x12 it lists the wheel weight as 20lbs.

 

What tire/wheel is this with? My R/TErnie trailing links have rub marks with 285 BFGs on an 18x10 et38. I run just 1/16-1/8" toe in so that'll make a bit of difference but I wont if there are different trailing links from him.

My upper fender wells are rubbed smooth, more so than I would expect for OPR rub. an 18x11 would be nice but Im not sure how to make it work without pulling fenders even more.

 

If you're actually sticking in SM, there are ways around that

My 18x11s are +25, but I have to run them with 20mm spacers to clear my springs in the front. With my fenders they work, but if you plan to keep your stock ones, I don't think it'd be doable without a huge pull.

 

the same tricks that work up front work in the rear. I have it on good authority that a 4" free length spring will work in the rear for improved tire clearance.

 

you have rub marks because a 10" wheel is way too skinny for the 285 bfg. you get TONS of lateral tire compliance with it stuffed on a wheel that small.

 

Hmm, good point. I need to get in there and see where I'm at with static clearance.

 

I am running Yokohama AD08 285/30/18 on 18x9.5. Pictures of me at the track show a lot of tire movement.

Luckily though, this isn't at the top of the tire where my limitation distance to the spring is. I would think minimum acceptable gap at full droop for the spring would be 3mm. For the trailing link, more along the lines of 5-10mm depending on wheel width.

The OD of my coilover springs are 95mm. What did you mean by:
I can't seem to find any information on the OD of Swift Coilover springs, just the ID.

 

He's not talking about diameter, he means overall length. With a shorter spring the tire wont hit the spring or perch and then just be limited by the body.

 

ive been toying with the idea of running 18x10.5+22 te37sl with 275/35 rs3. do you think i could run these with minimal issues other than a roll and pull? or should i just go with 18x10 +20 and 265/35

 

Ditto. I had not considered that. I will have to look into that. That would put the limitation back on the trailing arm and possibly the exhaust hanger (easy fix for the exhaust hanger). Swift does not appear to make any in that low of a length.

My concern would be for the amount of suspension travel this would allow.