Features:

• Fits wide and narrow tires - Designed with 29er or 700c wheels in mind, but will fit most wheel sizes
  
• Disc-brake compatible - Sometimes these newfangled disc brakes get in the way of accessory installation. This product was designed to make sure that isn't an issue

Specifications:

Capacity: up to 45 lbs / 20.5 kg
Mounting Options: Frame & Rear dropout mount compatible
Weight: 535 g