Hi All, My beater (ultra high mileage touring bike) has a set of fairly worn Sun R17 rims. To test how worn the brake track might be I inflated the tires to 100+ PSI (~30 PSI above tire rating) and compared the before inflation to post inflation measurement. The two measurements were the same. There are no cracks in the rim, but there are a couple of spots in the rear rim worn enough to show some white.

If I wanted to use the beater on a tour, I can swap in the wheel set from my regular touring bike.

I know the best method is to measure the rim's braking surface thickness, but I'm wondering about the validity of this little test.

TIA,
Brad