Super-9 Disc In Store Repair The RD-RX812 rear derailleur is

The RD-RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max

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Shimano only uses titanium where the softer metal doesn't create a significant negative impact

Super-9 Disc In Store Repair The RD-RX812 rear derailleur isSmoother is faster with the Zipp Super 9 Tubeless Disc Brake Disc. Among the lightest disc wheels available, the Super 9 is a superior addition to your modern triathlon and time trial bike. Its refined shape runs wide and parallel from the hub until it feathers inward as it meets the hookless tire bed. Thanks to Zipps Total System Efficiency (TSE) carbon laminate and design, the Super 9 is engineered for a new era of wider tires and lower tire