Sturdy Steel Frame & Fork Alloy Seat Post21-Speed Shimano ShifterAlloy Caliper BrakesShimano Rear Derailleur36-Spoke Alloy Rims provide lightweight construction for easy acceleration700 x 32c Tires.FITS RIDER | 5'6" - 5'10" (INSEAM 30"-32")MEDIUM SIZE | 54CMRECOMMENDED AGES | ADULTSTANDOVER CLEARANCE | 79CMSEAT TUBE LENGTH | 54CMTOP TUBE LENGTH | 55CM.