new wheel and tyre ride height change calculations

[frankyknuckles]

so by my calculations, if I change from CR500 195/45 tyres on 15" rims (556.5mm diameter), to Yoko AO48R 185/60 front (552.2mm dia) and 205/60 rear (576.2mm dia) on 13" rims, this will results in a front end height drop of approx 2.15mm (not bad), but the rear will be raised by 9.8mm.

 

Considering that I have had my car flat floored and it has the recommended 15mm drop from rear to front, if I change wheels and tyres, the overall drop will have increased to approx 27mm.

 

Is this acceptable in terms of rear to front height drop? and will tyre squash deminish this measurement by a small amount?

 

ie, is it worth worrying about?

 

(I think my calculations are correct? (change in ride height is measured by change in radius)

 

CC have confirmed that the cycle wing stays and cycle wings fitted to R300's with 15" wheels are the smallest they do, so there will be no need to change these

 

www.R300.net

[JamesTiptree]

Frankie, don't know if this helps but could confirm something?

 

http://www.miata.net/garage/tirecalc.html

[frankyknuckles]

thanks James, that just about confirms by calcs, front radius change of -0.1 inch and rear radius change of +0.3 inch.

 

so is this ride height change worth worrying about ?

 

If someone can assure me that this is negligable, I can put an order in for some new wheels and tyres

 

www.R300.net

[F355GTS]

Dave

 

Why not just drop the rear by the extra amount? with more rear height the car may oversteer more

 

Mark

[frankyknuckles]

yep, that's what I'll do.

 

www.R300.net