Topeak Tetrarack R2 R1 4 mm thick square chain

4 mm thick square chain with textile sleeve that prevents damage to paintwork

These spokes also have a patented elliptical shape that can save 5 watts for added efficiency

Cable Port and Grommet Kit - Di2

Fits all standard 2-rail saddles including oversized carbon rails

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Topeak Tetrarack R2 R1 4 mm thick square chainThe perfect quick mount rear rack system attaches to road, cross, hybrid or touring bike seatstays. This one size fits all rear rack features an innovative top plate that adjusts to level independent the seatstay angle. Integrated QuickTrack system allows Topeak TrunkBags to slide and lock into place and release with a the push of a button. Innovative hook and loop strap mounting system cinches down tight to keep the load stable and allow mounting on