Originally Posted by rm -rf

Back tires start showing a squared off tread after just a few hundred miles. It's due to the extra force applied to the tire by pedaling. But I think that as the squared off part gets wider, it takes a lot longer to get worn down to the cords under the rubber tread. I get at least 3500 miles from my rear GP4000.



I cut an old GP4000 in half to see how much tread was left when the holes were worn off. It's paper thin. So it's still rideable, but it won't be too much longer until the cords show through the rubber tread.

The wear indicators are two pits about an inch apart: