Why 19?

GTRFAN · 03-01-2010, 05:24 AM

The lower the side wall profile, the better the handling...generally. This would not be true for 22" wheels with a really thin tyre profile but it is true for most wheel diameters.

The thing to remember is that, the overall rolling diameter (circumference) MUST stay the same when you upgrade. So if you go from a 17" to 20" rim the tire profile % must get a lot smaller to maintain the overall diameter.

Tire sizes are also a strange beast with a mix of metric and imperial measurements.
285/35/20 means - 285 mm width/35% of 285mm sidewall/20 inch rim

03-01-2010, 05:24 AM	#1 (permalink)
GTRFAN Track Member Join Date: Dec 2008 Location: Melbourne Posts: 586 Drives: 370z Titanium 6MT Rep Power: 18	The lower the side wall profile, the better the handling...generally. This would not be true for 22" wheels with a really thin tyre profile but it is true for most wheel diameters. The thing to remember is that, the overall rolling diameter (circumference) MUST stay the same when you upgrade. So if you go from a 17" to 20" rim the tire profile % must get a lot smaller to maintain the overall diameter. Tire sizes are also a strange beast with a mix of metric and imperial measurements. 285/35/20 means - 285 mm width/35% of 285mm sidewall/20 inch rim __________________ My Zed