AO Silver Member
Join Date: Jan 2003
Location: idle to 7500rpm
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:<hr /><font size="1" face="Verdana, Helvetica, sans-serif">Originally posted by Jefro:
<strong>Thinking of buying a set of wheels off a 156 but the tyre size is 205 55 R16 (almost new) and the existing tyres on my car are 205 50 R16. Dont really want to change the tyres for the sake of it.
Are they OK to fit?
What effects will they have?
Any answers greatly received.
Jefro</strong><hr /></blockquote><font size="1" face="Verdana, Helvetica, sans-serif">Tire size determines the rolling diameter and rolling circumference which affect odometer and acceleration, as well as handling, grip, etc.
You can calculate the rolling diameter with the following formula:
[((width x aspect ratio) x 2)/25.4]+ wheel diameter = rolling diam.
[((205 x 0.55) x 2) / 25.4] +16 = 24.88 inch
[((205 x 0.50) x 2) / 25.4] +16 = 24.07 inch
Which means you're a little over 3% off from existing tires (OEM?). This will have marginal effect on mileage and speedometer. Differences of 1% - 3% are usually acceptable. Hope this helps.
//2000 156 2.0TS / AD Remap / Supersprint Exhaust / K&N Filter Kit / Rhoddy Harvey-Bailey Suspension / AR Strut bar /16" Telephone dials + Yokohama V550 / Tar-Ox discs + SS lines + MQ pads //
//2005 Subaru Impreza WRX PPP / K&N Short Ram-air Intake / Brembo 4-pot Brake Kits / Prodrive GC-010 British Black 18x7.5 Forged Alloys / Michelin Pilot Sport Cup / Prodrive Spring Kit / STi Aero kit //