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12 Speed SH Ratchet

This ratchet allows you to pair SRAM mechanical shifters and a SRAM Exact Actuation* rear derailleur with a 12 speed Shimano road cassette and 12 speed Shimano chain. You’ll gain all the advantages of greater gear range and closer gear ratios without the expense or weight of electronic shifting.

Check our 2x12SH Kit Guide for compatibility guidance. For more information, view our Support page here.

NOTE: You will need to replace your 11 speed jockey wheels with Shimano 12 speed compatible ones.

View our Support page here. For more information, check our compatibility guide.


SKU: 0055 Category:

The Ratio 12 Speed SH Ratchet allows you to operate a Shimano compatible 12 speed road cassette and chain with your existing SRAM road 10 or 11 speed shifters and SRAM Exact Actuation* rear derailleur.

Using a 12 SH ratchet gives you following advantages:

  • Closer gear ratios than 11 speed
  • Class leading shift quality with Shimano cassettes
  • Lower cost than a full Shimano groupset
  • Avoid consigning functional components to the bin, upgrade them instead.
  • The reliability and serviceability of mechanical shifting #humanpowered

In your kit you will find:

  1. Ratio 12 Speed SH ratchet, with shift spacing specially designed for Shimano 12 speed compatible road cassettes
  2. M2.5 screw for shifter ratchet replacement
  3. Ratio chainstay sticker

To use this ratchet you will need:

  1. SRAM 10 or 11 speed road shifters. If using 10 speed shifters you will also need a cable spool available separately here
  2. SRAM 1x or 2x rear derailleur with Exact* actuation cable pull
  3. Jockey wheels compatible with Shimano 12 speed chains
  4. A Shimano 12 speed road cassette
  5. A Shimano 12 speed chain
  6. A chainring compatible with 12 speed Shimano chains
  7. An 11 speed HG freehub

All products we offer for sale on our website are Ratio Technology products unless stated otherwise. All third-party products, company names and logos remain the property of their respective holders and use of them does not imply any affiliation with or endorsement by them.

To fit your ratchet to SRAM shifters for hydraulic brakes, see the following video**:


To fit your ratchet to SRAM shifters for cable brakes, see the following video**:

NOTE: On some older shifters, the reach adjuster will not spin freely when it bottoms out. Stop turning the reach adjuster screw as soon as you encounter resistance.

* Ratio Technology Limited is not in any way affiliated with, sponsored or endorsed by SRAM, LLC.

AXS®, DoubleTap®, eTap®, SRAM®,SRAM APEX®, SRAM EAGLE®, SRAM FORCE®, SRAM RED®, SRAM RIVAL®, X0®, X01®, XX1® are registered trade marks owned by SRAM, LLC. Eagle™, Exact Actuation™, GX™, NX™, SRAM APEX 1™, SRAM Force 1™, SRAM RIVAL 1™, S-series™, SX™, WiFLi™, X-Actuation™,  XD™, XDR™, XPLR™, XX™, Zero Loss™ are trademarks of SRAM, LLC.

105, Ultegra, Dura-Ace are registered trade marks owned by SHIMANO INC.

** Please note that modifying these components may void the original SRAM warranty.

Weight 100 g
Dimensions 17.5 × 11.2 × 2.2 cm

To reduce waste we will send orders of over 10 units as bagged kits with one set of instructions rather than individual kit boxes. You can find a PDF of the instructions on our website here . If you have ordered less than 10 kits but would also like to reduce the packaging of your bulk order or have any questions please email us at [email protected]. Equally if you would like the full packaging for orders of 10+ kits drop us a line too.

Large orders

If you wish to order more than 50 kits please contact us directly via [email protected]

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