Blatman Posted March 25, 2003 Share Posted March 25, 2003 Tommo Wotbox was definitely on 539's......... Quote Link to comment Share on other sites More sharing options...
hilux Posted March 25, 2003 Share Posted March 25, 2003 Anyone ever used an angle grinder either 9" or 4" While its spinning it has gyroscopic tendencies So does a car wheel, larger inertia/weight, harder to turn IMO Quote Link to comment Share on other sites More sharing options...
Turbo Tommo Posted March 25, 2003 Share Posted March 25, 2003 Tommo Wotbox was definitely on 539's......... Oh f**k, watch the brakes, they're not as good as yours............and you might need 'em! Quote Link to comment Share on other sites More sharing options...
ACW Posted March 25, 2003 Share Posted March 25, 2003 sorry tommo, 539 it was (duck was on 520's - god awful things they were - mind you they would last for ever). Marks brakes are good arent they..... Quote Link to comment Share on other sites More sharing options...
Guest Posted March 26, 2003 Share Posted March 26, 2003 Empirical evidence of a direct comparison between 15" and 13" wheels. 15" wheel weighs in the region of 16.5kg, 13" wheel about 11.5kg. Car running on 15" wheels felt "heavy" - it was harder to provoke the back end to move around and the intertia of the wheels meant that it was harder to get the rear wheels spinning. Also the ride height was higher which has an impact on the centre of gravity. Same car running on 13" wheels - OMFG !! Car felt light, nimble, turned in better was much more chuckable and getting the back end hanging out was easier and much more controllable. The factor was massively increased !! Neither set of tyres was particularly sticky - both Yokohamas but nothing more exciting than A520s (old) and something they call AVS Intermediates here in the US. Only other change to the car was to dial in a fraction more negative camber on the front with the 13" wheels (which in turn probably gave a little more toe-out). It really is chalk and cheese territory !! Unsprung weight makes a *massive* difference to these cars. Re the relative performance of the car, I suspect the the main culprit was the approximate 12.5% increase in the gearing (allowing for the tyre). This obviously affects both acceleration and braking. The feel, as you say, will be the increased unsprung weight. JD Quote Link to comment Share on other sites More sharing options...
Matt Seabrook Posted March 26, 2003 Share Posted March 26, 2003 7/21x13 acb10 and 7j13 wheel 10.4kg front 8/22x13 acb10 and 8j13 wheel 10.6kg rear 205/50x15 tyres and 7j15 wheel 16.4kg + 0.5kg spacers for rear Total with 15" rims tyres and spacers 66.6kg Total with 13" rims tyres on spacer’s 42kg Saving 24.6kg No surprise I can feel the difference. Quote Link to comment Share on other sites More sharing options...
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