Saracen Mantra Mountain Bike 27.5, Small 15 Frame. Bike is in excellent condition & has had little use. Any questions happy to help. Full spec below, thanks for looking :. Available sizes S, M, L, XL. Brakes Tektro M275, 160mm rotors. Fork SR Suntour XCM30 HLO, 120mm (4.7in) travel. Rear derailleur Shimano Tourney (3×8). Tyres Vee Crown Gem 27.5×2.3in. Wheels JHT rims, Joytech hub.