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 this kit your chain stay or seat stay derailleur cable stop must be over 70mm from the centre of the dropout. For those bikes where it is less than 70mm choose our 1×12 Wide Upgrade Kit – Rear Cable Exit.
In your kit you will find:
- Ratio 12-speed ratchet, with shift spacing specially designed for Eagle™ cassettes
- Ratio cable fin, replacing the existing cable fin on an Eagle™ derailleur
- Ratio cable adjuster, providing indexing ability on a mountain bike derailleur
- Spare cable fin circlip
- M2.5 screw for shifter ratchet replacement
- Ratio chainstay sticker
To use this kit you will need:
- SRAM 11-speed shifters from the Red™, Force™, Rival™ or Apex™ groups or the 10-speed S-700 shifters.
- 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.
- A SRAM Eagle™ 12 speed cassette. We can’t confirm that aftermarket cassettes will perform properly with your drivetrain.
- A 12 speed chain for SRAM Eagle™ drivetrains.
- 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
Mathias (verified owner) –
Highly recommended ! I was planning to build my own gravel bike from an aluminum frame with a large clearance for big tires (650x47mm). I ordered the kit and it arrived quickly in Switzerland. The assembly was quite simple (being an almost beginner in mechanics) thanks to the very well made videos ! The gearing is perfect and the 10-52 Eagle cassette allows me to climb almost everywhere. Great job!
christopher c –
Fantastic. Wanted a wide range “Mullet” on my gravel bike for a while but I didn’t like the price tag for E-shifting, nor do I see the point of it on a 1x gravel rig (no advantages for the average rider over mechanical). Install was a little fiddly, but don’t be put off, the shifter internals look complicated but once they are out you quickly see the mechanism is not very complex really (unlike Shimano) and overall it was pretty easy following along with the video. It actually shifts better now than it ever did originally with my Apex leavers. Makes me wish I had gone with SRAM for my road bike build!
james (verified owner) –
Purchased in January. Easy to switch out the 11speed ratchet for the 12 speed. Just follow the video. Great upgrade for my Road/Gravel bike to a mechanical 12 speed with a 10-52 Sram cassette , GX 12 speed derailleur and 12 speed chain. No need to spend $2000.00 + on the Sram electric 12 speed. For me I didn’t want an electric 1X 12 speed anyway. Everything is working as it should and actually shifts as well if not better that my 11speed. Thinking about changing over my other straight gravel bike as well. Fast shipping with great communication. Highly recommended.
Kurtis (verified owner) –
Great product! Installed for my Gravel bike using Sram force 22 shifter, sram force crankset 36t chainring and paired with XO1 52t cassette and derailleur. Super easy gear! The installation was fairly straight forward, just had to take my time and rewatch the video closely. Hardest parts for me was getting the axle through shift mechanism just hard to align hole while under tension and the c-clip for cable fin was a little fiddly trying not to loose clip. But other than that it works great, shifts feel the same as factory 11 speed shifter. I was hesitant on buying this product thinking I could damage my shifter, but so glad I installed it, and wasn’t so intimidating after all. I highly recommend this product, pretty much only option on the market to avoid electronic shifting.
Briain O’Shea (verified owner) –
I bought this kit for my nukeproof digger. It’s awesome. I was a bit worried about taking the shifter apart but the instruction video was really good and made it easy. So I ended up getting this to work keeping my SRAM apex 11 speed derailleur although I was always planning on using an e13 TRS cassette which is a 9-46. I think if you want full eagle 50 teeth you would have to change to a proper 12 speed derailleur. I also didn’t end up using the rear cable exit piece although I think that’s just the way the cable is routed on my frame made it unnecessary. Really happy with this
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.
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.
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.
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.
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!
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.