Rear Derailleurs

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Shimano and SRAM rear derailleurs — mechanical, Di2 and AXS electronic, from Dura-Ace and Ultegra to XTR, XT, SLX and Eagle. Short, medium and long cage options; official stock, brand new, with free shipping to the lower 48.

Rear Derailleur Buying Guide

Mechanical, Di2 and AXS electronic rear derailleurs for road and mountain — Shimano Dura-Ace, Ultegra and 105; XTR, XT and SLX; SRAM Eagle. Match a new derailleur with a fresh cassette and chain for the crispest shifting, or browse shifters and the full Shimano and SRAM ranges.

Quick guide: match brand AND speed to your shifter; pick cage length by your largest sprocket — short cage for close-ratio road cassettes, long cage for wide-range; electronic (Di2/AXS) only pairs within its own ecosystem.

Rear Derailleur FAQs

Can I use a Shimano derailleur with SRAM shifters?

Not in mechanical setups — cable-pull ratios differ between brands. Keep shifter and derailleur the same brand and speed.

What cage length do I need?

Check the derailleur's maximum sprocket spec against your cassette's largest cog — it's listed in every product's spec table.

Mechanical or electronic?

Mechanical is affordable and simple to service; Di2 and AXS shift faster and self-trim, but every part must come from the matching electronic ecosystem.

Cassettes

Pedals