Unisex Adult Mountain Bike 27.5" Wheels Cycling Adults Mountain Bike 21 Speed Bicycle+Bike Lock+Air Pump

Spoke Magnesium wheels: lightweight and more durable. The bicycle has been adjusted for shifting and braking before leaving the factory, and the disc brakes are automatically adapted. If the brakes are not tight, you can appropriately adjust the tension of the brake cable of the disc brake. Easy to install, please consult customer service if you need installation instructions.