I just got done changing out my specialized airlocks out. They are absolutely TERRIBLE. I made the mistake of buying them for the front and back and am now regretting it. For one they do a lousy job at sealing (from someone that walked their bike home yesterday about a mile). The sealant did come out of the hole and got all over my new sweater but didn't seal worth a damn. I lost 20lbs of air just last night with the "seal" job of the triple thread airlock 2's. Don't even try sticking a patch on them. The "slime" stuff doesn't let the patch stick. Overall rating 0 out of 10. I wish I had my 26 dollars back. I'd throw them towards some gatorskins or marathons.