Quote:
Originally Posted by DennisMenace
Hi Bill. Thanks a lot for your reply. Totally makes sense. I plan to run a-b at around 160 mm in the front with raised spindles. Isn’t the first number (95mm) the more critical number as it puts the wheel outwards towards the fender?
Thanks a lot,
Dennis
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You certainly want the f/s spec to be not much larger than ~90mm but there is a grey area where shorter tire though it stocks further out still clears the fender
The best way to get the f/s down w/ a 225/xx tire is to use a larger ET wheel
for 8s you would want ET27-28 as the best compromise between inner and outer clearance
for 7s though the wheel is narrower and pinches the tire sidewalls toward the wheel center more a bit higher ET is still desirable say ~ 25-26
Unfortunately, if you want 15" Fuchs you are stuck w/ 7 ET23.3 or 6 ET 36
The taller 205/55 x16 on a 7ET23.3 is often a problem at the lip the shorter 205/55 x15 on a 7ET23.3 is not because it is shorter.
a 225/50 x15 is still relatively short and thus does give some breathing room even w/ the f/s above 90mm.
Obviously you ride heigh is going to affect this situation as well.
I used to primarily look at a-b but find that it obscures the issue to a certain extent
b all by itself is the real measure of height, a varies w/ the tires spec
a 205/50 x15 R888 has an a of ~ 285mm
a225/50 x15 R888 has an a of ~295mm
so for the same b(aka ride height), a - b for the 225 will be larger by ~ 10mm
so if you have a -b w/ 225s of 160, that's the equivalent of a - b of 150 w/ 205/50
and you will have 10mm less height clearance at the lip.