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1x13C Upgrade Kit


This upgrade kit allows you to pair 10 or 11 speed mechanical SRAM shifters and a 1x-specific Exact Actuation™ derailleur with a Campagnolo Ekar™ 13 speed cassette and chain. You’ll gain all the advantages of greater gear range and closer gear ratios without needing a whole new groupset.

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

SKU: 0032 Category:

The Ratio 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 Exact Actuation™ derailleur. Pair with our Ratio Ring for a 13 speed drivetrain with a minimum of new components.

Using a 1x13C Upgrade Kit provides a number of benefits:

  • Greater gear range and/or closer gear ratios than 11 or 12 speed
  • No need to purchase new shifters and derailleurs to upgrade to 13 speed
  • No batteries to charge
  • The reliability, serviceability and low weight of mechanical shifting
  • #humanpowered

In your kit you will find:

  1. Ratio 1x13C ratchet, with shift spacing specially designed for Campagnolo Ekar™ cassettes
  2. Ratio 12 tooth jockey wheels with stainless Enduro bearings and labyrinth seals, specifically designed for Ekar™ chains
  3. M2.5 screw for shifter ratchet replacement
  4. Ratio chainstay sticker

To use this kit you will need:

  1. SRAM 10 or 11 speed road shifters. If using 10 speed shifters you will also need a Ratio cable spool
  2. SRAM 1x derailleur from the Force 1™, Rival 1™ or Apex 1™ groups, or a SRAM 1x derailleur from the 11 speed MTB groups with a Ratio cable fin and, if necessary for cable routing, a Ratio rear exit cable stop fitted. Ensure your derailleur has sufficient capacity for your chosen cassette size; note that 42t max derailleurs will shift perfectly on 10-44t cassettes.
  3. A Campagnolo Ekar™ 13 speed cassette
  4. A Campagnolo Ekar™ 13 speed chain
  5. A chainring compatible with the Ekar™ chain, such as our Ratio Ring
  6. An N3W™ freehub body

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.

*Please note that modifying these components may void the original SRAM warranty. Ratio Technology Limited is in no way linked to SRAM LLC or Campagnolo SRL.

Weight 95 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 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

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