【High quality aluminum Frame】ECARPAT has a high quality ultralight aluminum frame for riding and moving with ease,corrosion resistant and very easy to clean and maintain.【Brake&Shifter】Front and rear disc brakes ensure timely and effective braking,provide you better durability and stopping power for your rugged and damp adventures.The 21-speed drivetrain with Shimano shifters and Trigger Shifter allows you to find the most comfortable and efficient gear for the kind of road.【Suspension Fork】Equipped with a shock-absorbing fork that absorbs any bumps and inclines in the road for a smoother feeling ride.【27.5*2.125" Tire】27.5*2.125" Rubber mountain pattern tires with high friction. Anti-skid and wear-resistant with strong grip and puncture resistance for hillsides, gravel, city streets and trails.【Buy Guide】27.5 inch wheel bike Suits riders between 5'5" & 5'10".85% pre-assembled,easy to assemble, assembly tools included. Please don't assemble the fork BACKWARDS. If you have any questions about the bike, please do not hesitate to contact us for solution.