Topeak Explorer Tubular Disc Rack With Spring. Features: Designed exclusively for 26" , 27.5", and 700c bikes with disc brakes Wide clearance posts space rack away from disc brake caliper Fits frames with threaded rack mounting holes on the dropouts Tubular 6061 aluminum with QuickTrack plate which accepts all MTX2.0 series trunk bags Integrated spring clip is convenient for securing lighter weight cargo Compatible with both MTX Quick Track 1.0 and 2.0 57lbs weight capacity Not compatible with frames with asymmetrical chainstays Specs: Color:black (with spring) Weight:780g