LASCO 52T Chainring 170mm Aluminum Crank Arms Chainguard Crankset Silver Folding Ebike Bicycles E-bike, Folding Bike, Fixed-Gear, Single-Speed, or Fixie bike aluminum crank arms 170mm Crank Arm Length in strong aluminum Fits square taper bottom bracket spindles Fits on road, mountain, fixed geared fixies, BMX, track and single speed bikes Direct replacement for most Dahon, Tern Mobic, and Citizen folding bikes