Quote:
Originally Posted by ard
Going from a 285 (say 40) to a 275/40...
the change is 10mm wider, but 4mm taller- on each side, so 8mm more in diameter...8mm is a lot.
There are some tire calculators that will give you revs/mile for a set of numbers, but each mfg has a bit differnet specs. Not every - for example- 275/40-18 will have the same revs/mile
GL
Oh, BMW OE fitments are pretty solid matches. What does BMW put on their 20 inch rims? That should be fine
edit...but if you already have an oddball set on the front you may never find a good match.
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Because of the timing of things I've just went ahead with the Avon ZX7's with the same 275/40/20 as what's on their now giving me an approx 1.5% difference. I'm going to research what differential fluid to use and buy some transfer case fluid from BMW, its not the best outcome but my gosh this cars been running by somebody who doesn't give an absolute crap about it so with everything I'm doing I'm hoping it will be alright and if I'm not mistaken, 1.5% isn't ideal, but it's not really bad is it?
And, it's Chemix time very soon! So we're on the same page:
front toe negative 0.02 both sides
front camber balanced does that just mean within the machines/bmw' s camber specs
rear toe and camber just following the machines spec as good as possible?
Update
Went back through the links and member @JBF posted their before and after alignment which you said looked good. Both front and rear toe aiming for your target of negative -0.01 to -0.02 which is exactly what they managed and camber for both front and rear was as close to the machines spec
I think I'll just take that and ask Simon to match as close as possible.
08-08-2022, 06:43 AM
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