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Old October 24th 2011, 09:53
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Wally Wally is offline
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Join Date: Nov 2002
Location: The Netherlands
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I actually did already indeed Rich, just like you described, but think I got the wrong points connected...
With your answer I am a little confused even more what KPI and scrub radius is. MotoIQ had a great article about it the other day, using tie rod(?) and the lower ball joint of our Mc Pherson suspension system. Or is that just the upper and lower suspension point in the picture? Thought the upper one was the tie rod of the steering in the schematic?


However, I took the line through the upper Mc Pherson strut connection with the body and the lower ball joint. Thought afterwards I did it wrong and it needed be through the tie rod and lower ball joint. Maybe I did it correct after all?
Anyways, that gave me a scrub distance of +18mm. Still not sure now if that was correctly measured or not...
Mike specified a distance between 3/4" and 3". With 18mm I am right at the lower bandwidth of that.. a bit more might help. I have a little room in the wheel arch, but I think 17" might be better for track driving anyways, mostly because of wheelweight you feel the negative effect of it most on the front. 7x17" is half an inch less wide and with a few mm more spacer, might just give that added scrub we're after?

Tire centerline above is right against the rim contact path, which is somewhat confusing too. It doesn't seem to be the exact tire centerline..?

I'll post some of the pics I took of that tonight.

Last edited by Wally; October 24th 2011 at 11:00.
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