Pirelli Angel GTs at 5,000 miles

[Whoops]

That makes sense, Tev62. The issue here is whether the profile of the OEM 140/70 and the 160/60 result in different diameters. As I recall, they don’t so there should be no speedo variation other than that you describe.

Yep, I get what you are saying, like for like there should be very little difference in the aspect ratio, 2mm is the only difference there, minimal impact.

60% of 160 = 96 and 70% of 140 = 98

Yep, I get what you are saying, like for like there should be very little difference in the aspect ratio, 2mm is the only difference there, minimal impact.

60% of 160 = 96 and 70% of 140 = 98
At the risk of sounding like a mechanical idiot, I was curious how the odometer calculates mileage. In other words, is it based on tire revolutions (i.e. diameter) or does it work off engine revolutions? Just wondering if a different tire size could potentially cause miles to accumulate faster or slower as a result of non-OEM tire sizes.