The most common repair I've had to deal with are, of course, flat tires. There is no tool to make repairs easier, all you need are tire levers, a patch kit, or a spare tube. I suppose if I wanted to prevent the problem in the first place I'd put liners in my tires, but it's been so long since I've had a flat I don't know that it's really necessary. Now having said that I hope I didn't jinx myself with a flat tire on my rides this weekend.