12 Speed Mountain Bike Rear Derailleurs

The rear derailleur is one of the most important parts on the bike and ensures precise, fast and smooth shifting. Shimano and Sram are the leaders in derailleur development.

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RDM7100SGS
discount -33%
Shimano SLX RD-M7100 SGS 1x12-speed Rear Derailleur
In stock
Shimano SLX RD-M7100 SGS 1x12-speed Rear Derailleur

Rear derailleur for 1x12-speed systems, long SGS inner cage for 10–45 or 10–51 tooth cassettes, weight just 316 g.

24 reviews
59.49 €
Buy
We recommend
IRDM6100SGS
discount -19%
Shimano DEORE RD-M6100 SGS 12-speed Rear Derailleur
In stock
Shimano DEORE RD-M6100 SGS 12-speed Rear Derailleur

12-speed rear derailleur with an SGS inner cage for 51-tooth cassettes, Shadow Plus.

6 reviews
40.49 €
Buy
We recommend
78121
discount -8%
Sram GX Eagle Rear Derailleur 12-speed Lunar
In stock
Sram GX Eagle Rear Derailleur 12-speed Lunar

Brand-new Eagle rear derailleur, for new cassettes with 52 teeth, compatible with the previous 50-tooth models, new design.

16 reviews
131.99 €
Buy
RDM9100SGS
discount -31%
Shimano XTR RD-M9100 SGS Rear Derailleur
In stock
Shimano XTR RD-M9100 SGS Rear Derailleur

12-speed rear derailleur from the XTR M9100 set, SGS long cage.

9 reviews
179.99 €
Buy
81963
discount -10%
Sram SX Eagle Rear Derailleur 12 Speeds
In stock
Sram SX Eagle Rear Derailleur 12 Speeds

Basic MTB derailleur for Eagle 1x12 systems, for 10–50-tooth cassettes, Cage Lock and X-Horizon technology.

3 reviews
84.49 €
Buy
NX68092
discount -21%
Sram NX Eagle Rear Derailleur 12-speed
In stock
Sram NX Eagle Rear Derailleur 12-speed

New Sram NX Eagle rear derailleur for Sram 12-speed systems.

5 reviews
106.99 €
Buy
IRDM9250SGSA
discount -32%
Shimano XTR RD-M9250 SGS Di2 derailleur, direct mount
In stock Free shipping
Shimano XTR RD-M9250 SGS Di2 derailleur, direct mount

Shimano XTR RD-M9250 derailleur, long cage, direct mount, compatible with 10-51 cassette.

1 reviews
472.99 €
Buy
IGPM6250UPG02
discount -23%
Shimano Deore M6250 I-spec electronic set
In stock Free shipping
Shimano Deore M6250 I-spec electronic set

The set of an electronic derailleur, I-spec EV shifter, battery, charger, and quick connector Shimano Deore series 6200, for cassettes 10-51t.

509.00 €
Buy
RDM8120-2
Sale -44%
Shimano XT RD-M8120 SGS 12 sp. derailleur Black
In stock
Shimano XT RD-M8120 SGS 12 sp. derailleur Black

The new XT derailleur model, designed for 2 x 12 gears, SGS cage, weight 290 g

75.49 €
Buy
S871499
discount -26%
Sram GX Eagle AXS Transmission Upgrade Kit
In stock Free shipping
Sram GX Eagle AXS Transmission Upgrade Kit

GX Eagle Transmission AXS Upgrade Kit – a simple transition from mechanical to wireless shifting. Complete kit for upgrading a mechanical Eagle 90 or 70 to…

1 reviews
491.99 €
Buy
78123
discount -9%
Sram X01 Eagle Rear Derailleur 12-speed Lunar
In stock Free shipping
Sram X01 Eagle Rear Derailleur 12-speed Lunar

Brand-new Eagle rear derailleur, for new cassettes with 52 teeth, compatible with the previous 50-tooth models, new design.

2 reviews
251.99 €
Buy
RDM9100GS
Sale -46%
Shimano XTR RD-M9100 GS Rear Derailleur
In stock
Shimano XTR RD-M9100 GS Rear Derailleur

12-speed rear derailleur from the XTR M9100 set, GS short cage.

165.99 €
Buy
S90581
discount -4%
Sram GX T-Type Eagle AXS Rear Derailleur
In stock Free shipping
Sram GX T-Type Eagle AXS Rear Derailleur

12-speed electronic rear derailleur, Full Mount, Hangerless Interface, unmatched shifting performance.

1 reviews
450.99 €
Buy
90770
discount -37%
Sram Apex Eagle D1 Rear Derailleur
In stock
Sram Apex Eagle D1 Rear Derailleur

12-speed mechanical rear derailleur, an Eagle version for cassettes up to 52 teeth, quiet, fast and precise shifting.

94.49 €
Buy
S90766
Sram XX T-Type Eagle AXS Rear Derailleur
In stock Free shipping
Sram XX T-Type Eagle AXS Rear Derailleur

12-speed electronic rear derailleur, Full Mount, Hangerless Interface, unmatched shifting performance.

709.00 €
Buy
S90765
discount -14%
Sram XX SL T-Type Eagle AXS Rear Derailleur
In stock Free shipping
Sram XX SL T-Type Eagle AXS Rear Derailleur

12-speed electronic rear derailleur, Full Mount, Hangerless Interface, unmatched shifting performance.

599.00 €
Buy
IRDM9120SGS
discount -6%
Shimano XTR RD-M9120 SGS Rear Derailleur
In stock Free shipping
Shimano XTR RD-M9120 SGS Rear Derailleur

XTR M9120 12-speed rear derailleur with an SGS long inner cage, more precise and quieter performance.

263.99 €
Buy
RDM7120SGS
Sale -34%
Shimano SLX RD-M7120 SGS 12-speed Rear Derailleur
In stock
Shimano SLX RD-M7120 SGS 12-speed Rear Derailleur

Rear derailleur for 12-speed systems, long SGS cage for 10–45-tooth cassettes (2x12sp.), direct mounting, weight only 322 g.

1 reviews
52.99 €
Buy
RDM8100
discount -26%
Shimano Deore XT RD-M8100 SGS 1x12 sp. rear derailleur
In 2-3 days
Shimano Deore XT RD-M8100 SGS 1x12 sp. rear derailleur

The new XT derailleur model, 1x12-speed, with a range of up to 10–51 teeth on the cassette, long SGS cage, weight 284 g.

28 reviews
90.99 €
Buy
78124
Sram XX1 Eagle derailleur 12 sp. Lunar
In 3-4 days Free shipping
Sram XX1 Eagle derailleur 12 sp. Lunar

Brand-new Eagle rear derailleur, for new cassettes with 52 teeth, compatible with the previous 50-tooth models, new design.

5 reviews
344.99 €
Buy
RDM6100A
discount -32%
Shimano DEORE RD-M6100 SGS 12sp. rear derailleur SALE
In 2-3 days
Shimano DEORE RD-M6100 SGS 12sp. rear derailleur SALE

A twelve-speed rear derailleur with an SGS cage for cassettes with a 51-tooth sprocket, Shadow Plus

33.99 €
Buy
S74050
discount -8%
Sram XX1 Eagle AXS Rear Derailleur
In 3-4 days Free shipping
Sram XX1 Eagle AXS Rear Derailleur

Electronic derailleur for Sram eTap AXS 12-speed systems for both 50 and 52 tooth cassettes!

769.00 €
Buy
S00100226
discount -11%
Sram Eagle 70 T-Type derailleur
In 3-4 days
Sram Eagle 70 T-Type derailleur

Mechanical derailleur SRAM Eagle 70 T-Type, 12-speed, up to 52 chainrings, robust Full Mount construction.

123.99 €
Buy
S00100225
discount -10%
Sram Eagle 90 T-Type derailleur
In 3-4 days
Sram Eagle 90 T-Type derailleur

Mechanical derailleur SRAM Eagle 90 T-Type mechanical derailleur, 12 speeds, maximum 52 chainrings, robust Full Mount construction.

186.99 €
Buy
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