This replacement left crank arm is made of forged aluminum and features standard offset

Serfas' Drifter is a great tire for cruising down the bike path and rolling down city streets

Hollow forged crank maximizes power transfer while limiting weight

Patented GripLock retention design for dependable headset adjustment (US Patent 8662517)

Shimano TOURNEY BB-UN300 English SQUARE-JIS 73x113mm Bottom Bracket can be discounted This replacement left crank armSHIMANO Square Type Bottom Bracket MTB Standard Structure. Square Type Bottom Bracket SHIMANO quality performance cartridge bearing square bottom bracket Better chainline stability with chain line stabilizer 3 structures available Standard, E type, chain case options Adapter material: Aluminum