Delivering to:
Collecting from:

Rear Derailleurs

Derailleurs

Front Derailleurs

Mountain Bike Derailleurs

Road Bike Derailleurs

Compare (0/5)

Not sure what sized bike is best?

Answer a few short questions and we'll make a recommendation on which size is best for you.

Shimano RD-M3020-8 Acera 7/8-Speed Rear Derailleur Black

Shimano

Shimano RD-M3020-8 Acera 7/8-Speed Rear Derailleur Black

$45.00 Full price
$45.00
Club price
$49.99 Full price
SRAM GX Eagle Lunar 12 Speed Derailleur

SRAM

SRAM GX Eagle Lunar 12 Speed Derailleur

$225.00 Full price
$225.00
Club price
$232.00 Full price
Shimano Tourney Rear Derailleu 6/7speed RD-TY300

Shimano

Shimano Tourney Rear Derailleu 6/7speed RD-TY300

$21.00 Full price
$21.00
Club price
$23.99 Full price
Shimano Deore XT M8100 12 Speed Rear Derailleur

Shimano

Shimano Deore XT M8100 12 Speed Rear Derailleur

$199.00 Full price
$199.00
Club price
$209.00 Full price
Shimano Deore Shadow+ RD-M6100 12-Speed Rear Derailleur Long Cage 51T Max

Shimano

Shimano Deore Shadow+ RD-M6100 12-Speed Rear Derailleur Long Cage 51T Max

$89.00 Full price
$89.00
Club price
$100.99 Full price
Shimano Deore Shadow+ RD-M5100 11-Speed Rear Derailleur Long Cage 51T Max

Shimano

Shimano Deore Shadow+ RD-M5100 11-Speed Rear Derailleur Long Cage 51T Max

$72.00 Full price
$72.00
Club price
$74.99 Full price
Shimano SLX Shadow Plus 12 Speed 51T Long Cage Rear Derailleur

Shimano

Shimano SLX Shadow Plus 12 Speed 51T Long Cage Rear Derailleur

$109.00 Full price
$109.00
Club price
$119.95 Full price
Shimano Deore Shadow + M5120 10/11 Speed Derailleur

Shimano

Shimano Deore Shadow + M5120 10/11 Speed Derailleur

$79.00 Full price
$79.00
Club price
$89.99 Full price
Shimano Cues Shadow RD-U6000 Rear Derailleur 10/11-Speed Medium

Shimano

Shimano Cues Shadow RD-U6000 Rear Derailleur 10/11-Speed Medium

$85.00 Full price
$85.00
Club price
$89.99 Full price
Sram X01 Eagle AXS 12 Speed Rear Derailleur Max 52T - Lunar (Battery Not Included)

SRAM

Sram X01 Eagle AXS 12 Speed Rear Derailleur Max 52T - Lunar (Battery Not Included)

$899.00 Full price
$899.00
Club price
$925.00 Full price
Shimano Altus M310 7/8 Speed Derailleur

Shimano

Shimano Altus M310 7/8 Speed Derailleur

$31.00 Full price
$31.00
Club price
$34.99 Full price
Shimano Alivio Shadow M3100 9 Speed Rear Derailleur

Shimano

Shimano Alivio Shadow M3100 9 Speed Rear Derailleur

$60.00 Full price
$60.00
Club price
$61.99 Full price
Shimano Cues RD-U4000 Shadow 9-Speed Rear Derailleur 46T

Shimano

Shimano Cues RD-U4000 Shadow 9-Speed Rear Derailleur 46T

$68.00 Full price
$68.00
Club price
$71.99 Full price
Shimano RD-R9250 Dura-Ace Di2 12-Speed Rear Derailleur
26% Off Full Price

Shimano

Shimano RD-R9250 Dura-Ace Di2 12-Speed Rear Derailleur

$739.00 Full price
$739.00
Club price
$999.00 Full price
Shimano Altus M370 9 Speed Derailleur

Shimano

Shimano Altus M370 9 Speed Derailleur

$39.00 Full price
$39.00
Club price
$44.99 Full price
Shimano CUES Shadow RD-U8000 Rear Derailleur 11-Speed 50T Max

Shimano

Shimano CUES Shadow RD-U8000 Rear Derailleur 11-Speed 50T Max

$136.00 Full price
$136.00
Club price
$143.99 Full price
Shimano RD-R8150 Ultegra 12-Speed Derailleur
29% Off Full Price

Shimano

Shimano RD-R8150 Ultegra 12-Speed Derailleur

$439.99 Full price
$439.99
Club price
$625.00 Full price
MicroShift Advent M6195M Rear Derailleur 9 Speed

MicroShift

MicroShift Advent M6195M Rear Derailleur 9 Speed

$100.00 Full price
$100.00
Club price
$104.99 Full price
Shimano XT Shadow+ RD-M8000 11 Speed Rear Derailleur

Shimano

Shimano XT Shadow+ RD-M8000 11 Speed Rear Derailleur

$159.00 Full price
$159.00
Club price
$179.99 Full price
Shimano RD-M8130 XT Shadow+ Rear Derailluer 11-Speed 50T Maximum
17% Off Full Price

Shimano

Shimano RD-M8130 XT Shadow+ Rear Derailluer 11-Speed 50T Maximum

$165.00 Full price
$165.00
Club price
$199.95 Full price
Shimano Tiagra RD-4700-GS 10-Speed Rear Derailleur

Shimano

Shimano Tiagra RD-4700-GS 10-Speed Rear Derailleur

$75.90 Full price
$75.90
Club price
$87.99 Full price
Shimano 105 Di2 R7150 12 Speed Rear Derailleur
34% Off Full Price

Shimano

Shimano 105 Di2 R7150 12 Speed Rear Derailleur

$329.99 Full price
$329.99
Club price
$500.00 Full price
MicroShift ADVENT X RD-M6205AM Medium Cage Rear Derailleur 1x10 Speed 11-48T Black

MicroShift

MicroShift ADVENT X RD-M6205AM Medium Cage Rear Derailleur 1x10 Speed 11-48T Black

$140.86 Full price
$140.86
Club price
$154.95 Full price
Shimano XTR RD-M9100 Shadow+ 12-Speed Long Cage Rear Derailleur

Shimano

Shimano XTR RD-M9100 Shadow+ 12-Speed Long Cage Rear Derailleur

$369.00 Full price
$369.00
Club price
$399.99 Full price
SRAM NX X-Horizon Type 2.1 11 Speed Long Cage Derailleur
16% Off Full Price

SRAM

SRAM NX X-Horizon Type 2.1 11 Speed Long Cage Derailleur

$125.00 Full price
$125.00
Club price
$150.00 Full price
Shimano RD-M9100 XTR Shadow+ Rear Derailleur 12-Speed

Shimano

Shimano RD-M9100 XTR Shadow+ Rear Derailleur 12-Speed

$369.00 Full price
$369.00
Club price
$399.99 Full price
Shimano RD-U3020 CUES Rear Derailleur 9 Speed Shadow Long 36T Max

Shimano

Shimano RD-U3020 CUES Rear Derailleur 9 Speed Shadow Long 36T Max

$42.00 Full price
$42.00
Club price
$44.99 Full price
MicroShift ADVENT RD-M6195L Long Cage Rear Derailleur 2x9 Speed

MicroShift

MicroShift ADVENT RD-M6195L Long Cage Rear Derailleur 2x9 Speed

$116.00 Full price
$116.00
Club price
$119.95 Full price
Shimano Deore Shadow M6000 10 Speed Derailleur

Shimano

Shimano Deore Shadow M6000 10 Speed Derailleur

$99.00 Full price
$99.00
Club price
$114.99 Full price
Shimano XT Shadow RD-M786 10 Speed Medium Cage Derailleur
19% Off Full Price

Shimano

Shimano XT Shadow RD-M786 10 Speed Medium Cage Derailleur

$129.00 Full price
$129.00
Club price
$159.99 Full price
SRAM RD NX Eagle Rear Derailleur

SRAM

SRAM RD NX Eagle Rear Derailleur

$175.00 Full price
$175.00
Club price
$198.00 Full price
Shimano Tourney TY500 6/7 Speed Hanger Mount Derailleur

Shimano

Shimano Tourney TY500 6/7 Speed Hanger Mount Derailleur

$27.00 Full price
$27.00
Club price
$29.99 Full price
Shimano RD-U4020 CUES Rear Derailleur 9 Speed Shadow Long 36T Max

Shimano

Shimano RD-U4020 CUES Rear Derailleur 9 Speed Shadow Long 36T Max

$55.00 Full price
$55.00
Club price
$57.99 Full price
MicroShift Advent X Rear Derailleur 1x10 Speed Medium Cage w/Clutch 48T Steel

MicroShift

MicroShift Advent X Rear Derailleur 1x10 Speed Medium Cage w/Clutch 48T Steel

$145.00 Full price
$145.00
Club price
$151.95 Full price
Shimano XT Shadow M8000 11 Speed Medium Cage Derailleur

Shimano

Shimano XT Shadow M8000 11 Speed Medium Cage Derailleur

$159.00 Full price
$159.00
Club price
$184.99 Full price
Sunrace 7/8 Speed Rear Derailleur

Sunrace

Sunrace 7/8 Speed Rear Derailleur

$37.00 Full price
$37.00
Club price
$39.99 Full price

Find Your Size

Step 1: Measure your height

  • Take off your shoes
  • Stand with your back straight against a wall
  • Balance a book on your head to mark your height on the wall
  • Measure your height by the distance from the floor to the mark
cm

Find Your Size

Step 2: Adjust your inseam

  • Based on your height, we’ve calculated a starting point.
  • You can measure your inseam by tucking a book between your legs so there is pressure but it isn’t uncomfortable.
  • Inseam typically falls with 5cm of the average.
cm

Find Your Size

Your results

For the we suggest the following size.

More comfort More speed
Height: --
Inseam: --
Adjusted Height: --

Find Your Size

We have saved your measurements.

Recommended sizes will now be highlighted on the page.

Most Popular Brands

5% BEST PRICE GUARANTEE

5% BEST PRICE GUARANTEE

We beat any price by 5%
CLICK AND COLLECT

CLICK AND COLLECT

Live stock availability
CLUB 99 MEMBERSHIP

CLUB 99 MEMBERSHIP

Exclusive club benefits
FREE SHIPPING OVER $99*

FREE SHIPPING OVER $99*

*Excluding bikes/bulky items

99 Bikes acknowledges the Traditional Custodians of the Land on which we live, work and ride, and pay respects to Elders past and present

Welcome Here
Australian Aboriginal Flag
Torres Strait Islander Flag
Acknowledgement flag