Joined: Dec 2004
Posts: 12,560
Likes: 799
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Bacchetta Quattro, Catrike Speed
I don't like using anything smaller than 14 teeth in normal practice. Efficiency starts dropping a slight amount at 13 teeth, and more precipitously starting at 12 teeth. Ten teeth? <shudder> I can't imagine that'll ever be popular except with the type of cyclists who doesn't go fast but likes the ratios that a 10T gear can produce.