Dinan 3.45 Rear Differential

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12-24-2006, 12:04 AM

#11

ruffryder037roa

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My Ride: 2004 Titanium Gray/Black Leather 545i, 6SP Manual, Sport Package, Anthracite Maple Wood, Satellite Preparation. H&R coilover suspension, Radenergie 20's

I take it back. I just recalculated. 275/30/20 is 3.5% bigger than 275/35/18 in overall diameter.

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12-24-2006, 07:56 AM

#12

AlexFW

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12-24-2006, 06:00 PM

#13

EuroCarFan

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Quote:

Originally Posted by Bubbarossa' post='370688' date='Dec 23 2006, 11:16 PM

Go to bigger wheels you gotta lower you ring and pinion (numerically higher) ratio. You might pick up some top-end speed, but your accleration will suffer from the larger wheels, or overall increase in diameter.

Yeah, I was reading a European Car article on a Hamann widebody M5 with 21" wheels. They said the increased rolling resistance hurts speed and that a modest 20hp increase from performance products would be needed just to get the car back to factory performance numbers.