Quote:
Originally Posted by Dubbedown
Does this reflect the info in paintpro's thread? I know his comments were regarding 17s but 255/40-17 are still same diameter as the 18 in 255/35...
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a 255/40r17 is only 0.26mm different in diameter from a 255/35r18, so the question of diameter doesn't apply to that part of your setup.
BUT, and i'm sure you know this already, going from a 8.0 et47 to a 9.5 et35 will definitely alter the SR. i understand you plan on lowering the car, and you'll need to add neg camber... and HACK is probably better at explaining this than i... you'll have a positive scrub radius of
~ 31mm, which is not great for cars like ours with a macpherson system. but you'll have boat-loads of grip!!
here's my favorite resource for info on SR..
http://www.hrsprings.com/technical/scrub_radius
EDIT!
the 31mm above is for the the external movement of the wheel face in relation to a stock ZSP wheel, NOT the scrub radius. SR really only moves
7.05mm positive from stock, as long as the suspension remains stock as well. adding neg camber complicates things a bit, as the center line of the tire's contact patch moves in, in relationship to the center line of the wheel. by my logic, that means that the SR "point" may move depending on tire compression and spring compression.
here is the math behind the SR edit...
8.00in = 203.20mm
divide by 2 = centerline = 101.60
plus 42.00mm offset = 148.60
9.50in = 241.30mm
divide by 2 = centerline = 120.65
plus 35.00mm offset = 155.65
155.65mm - 148.60mm = 7.05mm (positive)