RockRider xc401. Upgraded with original Shimano group set. Brake: Shimano mt200 (upgraded). Shifter (F): Shimano m310. Shifter (R): Shimano Altus (9 speed). Crank: Shimano. Cassette: Shimano original 9 speed. Rear derailleur: Shimano acera. Wheel size: 27.5 (original Kenda tires). Seat: Promend. Seat post: Fmxstar. Stem: Wake. Grip: Odi. Location: Gazipur Signboard. Buy a good bicycle and save money. Those who know about Rockrider know how good this bike is. The bicycle is very smooth, just take it and ride.