Trek 3500 alpha silver aluminum mountain bicycle, sizes 13 / 16 / 18 / 19.5 / 21 / 22.5", front hub formula FM21 alloy, rear hub formula FM31 alloy, rims bontrager AT-550 36-hole alloy, tyres bontrager LT3, shifters shimano altus EF51, pedals wellgo nylon platform, tektro alloy linear-pull brakes, shimano altus levers.