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1 x 13 C Kit Guide

1×13 C

What’s it for?

The 1x13C Upgrade Kit allows you to operate a Campagnolo 13 speed Ekar* cassette and chain with your existing SRAM road 10 or 11 speed shifters and 1x-specific SRAM Exact Actuation* derailleur. Pair with our Ratio Ring for a 13 speed drivetrain with a minimum of new components.

The kit is specifically designed around the variable sprocket spacing of Ekar* cassettes. Other 13 speed cassettes are considerably wider and will not work with our kit.

What’s in the kit?

In this kit you’ll find a 1x13C ratchet for your SRAM road shifters, with shift spacing specially designed for Campagnolo Ekar* cassettes, as well as a pair of Ratio 12 tooth jockey wheels with stainless Enduro bearings and labyrinth seals, specifically designed for Ekar* chains.

1x13c Compatibility:


  1. SRAM Force 1, Rival 1 and Apex 1
  2. SRAM 1×11 mtb derailleur with Ratio cable fin
  3. Other SRAM Exact Actuation derailleurs with sufficient sprocket capacity
  4. Campagnolo Ekar 13 speed Derailleur
  5. SRAM Apex Eagle
  6. SRAM Apex XPLR


  1. SRAM 11 speed road all models
  2. SRAM 10 speed road (using Ratio Cable Spool)


  1. Campagnolo Ekar 13 speed
  2. All third party 13 speed cassettes


  1. Campagnolo Ekar 13 speed
  2. All 12 speed chains


  1. Ratio Ring
  2. Campagnolo Ekar chainrings
  3. 1×12 chainrings

Green – Recommended

Amber – We’ve tested some of these and, for derailleurs in particular, some options will be an issue. These issues are related to jockey wheel clearance and total derailleur range of movement.

Red – Not recommended

*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. The use of these trademarks in the table below is for informative purposes only, and all trademarks remain the property of SRAM, LLC.