The only exception for 9-speed groupsets is pre-1997 Dura-Ace gearing, which won’t play nicely with anything because it uses a totally different cable pull ratio The situation is a little more clear with SRAM and we’ve summarised the main points below. SRAM road and gravel derailleur compatibility Apart from first-generation Dura-Ace Di2, which uses a different wiring harness, the second (11-speed) generations are inter-compatible, across road, gravel and mountain bike groupsets as they all use the SD50 wires and share the same electronics. Almost all modern mountain bike derailleurs (and Shimano’s GRX gravel groupsets, Ultegra RX rear derailleur, Campagnolo Ekar, SRAM’s single-ring road groupsets and eTap AXS 12-speed road rear derailleurs) include a clutch mechanism.

While the derailleurs will work, chainlines differ between GRX, Shimano’s road groupsets and its mountain bike groupsets. Chain reaction Cycles and CRC are trading names of Wiggle Ltd (In Administration) registered in the United Kingdom at 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN,Campagnolo’s Super Record EPS electronic groupset is on version four now and has gone 12-speed. Again, it’s a system unto itself, with its own electronics to communicate between the shifters and the rear derailleur. Dura-Ace 7970 and Ultegra 6770 Di2 10-speed components are not compatible with each other. This is because they use different wires, with the Ultegra variant using the SD50 type that would go onto be used on 11-speed. If you find an item at a lower price with another commercial internet retailer, you will receive it from us at the same price, provided the conditions listed in the link are met. Campagnolo has introduced many changes to its groupsets, resulting in reduced compatibility between generations. So boxed letters (indicating the ranges) will aid you in identifying if your parts are compatible.

If you wish to return your bike to us please keep it in the box it arrived in and call us on 01772 644340 and we will arrange a collection.

SRAM REAR DERAILLEUR

Current 9-speed Shimano mountain bike components are compatible with older 9-speed road and mountain bike components, excluding the aforementioned exception The current 12-speed generation of Shimano electronic groupsets have inter-compatible wiring and electronics and use the newer SD300 wire variant. Most* 8- and 9-speed Shimano mountain bike and road kit is inter-compatible because they both use the same cable pull ratio. This means you can use an 8- or 9-speed mountain bike derailleur with road shifters, or vice versa Deore XT rear derailleur delivers reliable and precise shifting with a stiff and lightweight open design