Octane One External Bottom Bracket A unique bottom bracket type by Octane One. This special external BBfor BMX cranks is compatible with all MTB frames with threaded bottombrackets (Euro BB). This solution has similar weight to Euro BB’s but offersa lot more durable Spanish BB sealed bearings in external BB cups. Don’t worry
- the chain line is perfect for MTBSpecifications:compatible with 19mm crank axlesexternal aluminium cups with two big & strong Spanish BB sealed bearingscompatible with all MTB frames with 68mm Euro BBweight: ~185g Buy Octane One External Bottom Bracket from Chain Reaction Cycles, the World’s Largest Online Bike Store.