The reason I crashed my 29er yesterday jumping (twice) both times involved my foot slipping off the pedal. Now, I was wearing the wrong shoes, but another rider with better shoes tried my pedals (bear traps) and couldn't get grip either. The outer grip on the beartraps is great, but no grip on the inside, anyone got any suggestion? Since "expensive" is a relative term, let me just say, I'd like to be around $30 give or take and cheaper is always better. I won't be riding for a while until they know my shoulder is healed.