B are really mild lowering and a nice soft progressive rate. They ride pretty nice. C are just plain rough to me and they lower more aggressively than B. F is kinda in the middle... a little more lowering and a little more aggressive rate than B but not so punishing as C springs. As springs like these go, F always made me happiest for day to day stuff. For more serious work, C springs are the only way to go. Guys with big wheels and tires or guys with long tubes would like B's for the mild drop so they don't rub or scrape like they'd get with B's or C's
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