Shimano 105 RD-R7100 rear derailleur, 12-speed

The mechanical 105 rear derailleur for 12-speed road bikes. It brings the stable, low-profile Shadow RD design down to 105 level, with enough range to take a 36-tooth low sprocket for climbing.

Highlights

• 12-speed 105 rear derailleur for double chainsets
• One cage length covers the whole range: 34T to 36T low sprocket
• Shimano Shadow RD design for stable shifting
• Direct mount compatible
• Average weight 249 g

Range where you want it

A 36T low sprocket gives a genuinely useful bail-out gear on a double chainset, so you can ride longer climbs seated without over-gearing the rest of your cassette.

Compatibility and fit

For Shimano 12-speed road drivetrains with a matching 12-speed shifter and cassette. The RD-R7100 comes in a single cage length rather than the short (SS) and medium (GS) options of the 11-speed 105 derailleurs, and it is designed for an 11-34 or 11-36 cassette: the low sprocket must be between 34T and 36T, with a total capacity of 41T and a maximum chainring difference of 16T. For double chainrings. Fits a standard derailleur hanger and is also direct mount compatible. If you are unsure whether your cassette is within range, ask us before you order.