Stem Black Finish Aluminum Quill 26in EXT:90MMx0, 24in EXT:75MMx0 S.B. Crank/Bottom Bracket/ Derailleur / Shifter PROWHEEL 40/48T 152mm on 24in bikes, 42/52T 170mm on 26in bikes. ALLOY BLACK CRANK. Aluminum Rear Triangle with replaceable rear derailleur hanger and guard.