1×12 Wide Upgrade Kit – Forward Cable Exit

(6 customer reviews)


This upgrade kit allows you to pair 11 speed mechanical SRAM shifters with a 12 speed Eagle™ derailleur and cassette. This is the neatest solution on the market to gaining all the performance advantages of a wide-range 1×12 drivetrain on a gravel, road or touring bike without the expense of electronic shifting.

You can fit this kit if your chain stay/seat stay cable stop is over 70 mm from the dropout. If it is under 70 mm from the dropout you’ll need the 1×12 Upgrade Kit – Rear Cable Exit. For more information on kit compatibility, check our compatibility guide.

View our Support and FAQs here.

Discount Range Discount Price
5% 5 - 9 £70.78
10% 10 - 50 £67.05
SKU: 0001 Category:

As cyclists, we design the products we want on our bikes. The Ratio 12-Speed Upgrade Kit allows you to operate an Eagle™ derailleur with your existing SRAM 11-speed shifters, gaining an unbeatable 500% or 520% range and 12 evenly spaced gears on your gravel, road or touring bike. For reference, a traditional 50/34 compact chainset with 11-28 cassette provides only 374% range.

IMPORTANT: To fit an Eagle™ derailleur to your bike, make sure that your chain stay or seat stay derailleur cable stop is over 70 mm from the centre of the dropout – see diagram for details

In your kit you will find:

  1. Ratio 12-speed ratchet, with shift spacing specially designed for Eagle™ derailleurs
  2. Ratio cable fin, replacing the existing cable fin on an Eagle™ derailleur
  3. Ratio cable adjuster, providing indexing ability on a mountain bike derailleur
  4. Spare cable fin circlip
  5. M2.5 screw for shifter ratchet replacement
  6. Ratio chainstay sticker

To use this kit you will need:

  1. SRAM 11-speed shifters from the Red™, Force™, Rival™, Apex™ or S Series™ groups.
  2. An Eagle™ derailleur from the XX1™, X01™ or GX™ groups. The kit is NOT COMPATIBLE with SX™ and NX™ derailleurs as the cable fins on these derailleurs are riveted in place.
  3. A SRAM Eagle™ 12 speed cassette. We can’t confirm that aftermarket cassettes will perform properly with your drivetrain.
  4. A 12 speed chain for SRAM Eagle™ drivetrains.
  5. A 1×12 speed compatible chainring.

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.


To fit your cable fin to an Eagle™ derailleur, see the following video*:


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

Weight .07 kg
Dimensions 17 × 11 × 2.5 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 https://ratiotechnology.com/support/ . 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 info@ratiotechnology.com. 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 info@ratiotechnology.com

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6 reviews for 1×12 Wide Upgrade Kit – Forward Cable Exit

  1. David

    So stoked!
    The wizards @ratiotechnology made a affordable mullet 12-speed possible.The Installation was a piece of cake. Just follow the steps. The Parts are good quality!
    It shifts smooth and works just fine. A superb Upgrade to my Bike.
    Give the people what they want.
    Mechanical 12-Speed Mullet Drivetrain.

  2. Jeremy Abram (verified owner)

    This kit is brilliant, I’ve done about 150 miles with it now and the shifting is spot on and is running my GX Eagle derailleur perfectly. It’s easy to fit by following the step by step guide in the videos. Very highly recommend indeed!

  3. Daniel (verified owner)

    It can be a little tricky to get the spindle out of the shifter once at that step, but everything else is a snap. Looking to convert more of my bikes now. I love that I can still use my old 11speed cassette (With it’s chain) after the conversion.

  4. Mark (verified owner)

    I’m so pleased with my new 1x 11-46 setup which is perfect for winter road/occasional gravel use. I’ve used a “ztto” cassette from aliexpress.com which although a bit of a shot in the dark arrived promptly, works perfectly and well priced at $70. Fits a standard shimano/sram spline. The video guides are super clear so long as you pause and rewind as you go along. Big shout out to Tom for very responsive, extensive detailed advice by email while gathering the components.

  5. Rob Labatt (verified owner)

    Love, love, love my Ratio 12-speed conversion. Simple install and tuning. Just works, out of the box. Ratio customer service is a delight, but if you read the instructions carefully you won’t need them.

  6. Patrick Liam Carroll (verified owner)

    Installation video looked daunting, but I gathered the tools and such, gathered my nerves, and just followed the procedure with patience and persistence. The video has clear shots of what’s going on and is a huge help. Now I have to blow mega cash on an Eagle setup. Can’t wait.

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