I've only had one flat of my own, and I fixed that myself. My sister bought a like new, but with old tires Schwinn suburban at a garage sale a couple of weeks ago, and I replaced the tires, tubes, rim strips etc... so she'd be able to resume riding again. She got a few rides in on her "new" bike before she had a flat - I'd pinched one of the tubes so I drove for an hour to fix it for her.