Joined: Jun 2011
Posts: 1,180
Likes: 0
From: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
Could be the rims themselves. Older generation rims pre-1980s, might have not have a "hook-bead" inner wall. This makes them incompatible with lots of new higher pressure clincher tires. At the same time, double check the specs on the rims if they are embossed or there is still some label on the rims.