bicycle brake shoes are provided for a bicycle braking device . the brake shoes are pressed into contact with a bicycle wheel rim to apply a braking force thereto . the brake shoes are coupled to the bicycle braking device by brake shoe holders . each brake shoe includes an attachment portion coupled to the brake shoe holder and a rim contacting portion for contacting the side braking surface of the rim . the brake shoes are formed from a polymer that is obtained by cross - linking sbr with peroxide of adhesive or sulfur . the brake shoe is elongated in the rotation direction of the wheel rim and has a braking surface opposite to the braked surface of the rim .