Crazy BMW speedo error

[Rev Z-Man]

Sure, why not? 1/4 [10/32 (MX4 Tread depth) - 2/32 (legal low limit) = 8/32] of an inch over the entire rolling radius of the wheel is a huge difference -- well, not huge but just over 3/4" over the lifespan of the tires. (Bridgestones would give you an extra 1/32" of rubber. )

[rayxi]

Wearing your tires down to zero tread would only make your speedometer read 1.7% faster than new tires. If your speedo reads slower it's not due to tire wear.