Specifications: Item 29er full suspension frame Size 15.5'',17.5'',19'’,21''(C-T) Use Mountain bikes Seat tube: 31.6mm Material Full carbon Weight 1850±40g Head set Top:1-1/8" Down:1-1/2" Cable routing Inner cable routing Rear QR & AXEL BB type BSA & BB30 Brake Disc brake only Supply with Headset Warranty 2 year Standard En Standard Design characters: Ø Super stiff and strong full carbon monocoque stucture and design. Ø Internal cable routing: full internal cable routing for brakes and shifter cables maintains the cleanest line for optimal aerodynamics. Ø Using Toray T700 carbon fiber, it's high tensile strength and modulus, good corrosion resistance, it makes the frame durable and comfortable. Ø If you are going to expand your 29er MTB frame, this model will not let you down.