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Ratio Makes DIY Upgrades to 12-speed Even More Affordable with 2x12SH Kit

Ratio 2x12SH Upgrade Kit, SRAM mechanical Rival shifting a Shimano 12sp cassette
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Making the leap from old SRAM 11-speed to modern 12-speed road just got cheaper AND one step simpler, thanks to this new Ratio 2x12SH Upgrade Kit. Ratio already created the lightest 2×12 groupset out of your old SRAM Red. But now you can go 12sp without needing to switch to a new freehub body. All thanks to Ratio and new Shimano 12-speed cassette compatibility…

Ratio 2x12SH Upgrade Kit from SRAM 11sp to 12sp Shimano

Ratio 2x12SH Upgrade Kit, mashup road SRAM 11sp and Shimano 12sp groupsets into SRAmano 12, update your old rim brake road bike to the latest gearing
(Photos/Ratio)

We’ve loved what Ratio has been doing since their first time we saw their 3D-printed stainless steel ratchet that converted 11speed SRAM road shifters to operate an Eagle mountain bike derailleur. Their simple creation gave new life to a lot of old gear. Especially as more roadies and cyclocross riders headed further off track on gravel adventures. More recently, Ratio made another road-focused upgrade kit. That converted SRAM 11 to SRAM 12 – likely creating the lightest 2×12 road groupset possible, thanks to the lightness of the original mechanical Red 22 group. But it required buying their upgrade kit, plus a SRAM 12-speed AXS cassette, a flattop chain, flattop-compatible chainrings, AND most importantly switching from your old HG freehub body to a new SRAM XD-R driver body. Most but not all wheels could be changed over.

Ratio 2x12SH Upgrade Kit, mashup road SRAM 11sp and Shimano 12sp groupsets into SRAmano 12, on old HG freehub body

So, now you get to stick with your old-school Shimano HG freehub…

What’s new? SRAmano 12sp!

Ratio 2x12SH Upgrade Kit, mashup road SRAM 11sp and Shimano 12sp groupsets into SRAmano 12, Force & Rival group updated

The secret of the new Ratio 2x12SH Upgrade Kit converting SRAM 11 to 12 upgrade is actually Shimano. You see, the latest Shimano 12-speed road groupsets still use their old HG freehub standard. So, by popular demand from their customers, Ratio went back to the drawing board.

Ratio 2x12SH Upgrade Kit, 3d-printed stainless steel ratchet for SRAM-to-Shimano conversion

Now, they’ve created a new internal ratchet that upgrades your SRAM 11sp shifter to match the exact spacing of a Shimano 12sp cassette.

How-To: What do you need?

Simply open up you old SRAM shifter, swap in the new ratchet, and you are good to go.

Out back you will also need to swap in the new derailleur pulleys into your exiting SRAM derailleur. Because Ratio says, “the geometry of Shimano 12 speed road cassettes means it is necessary to use a slightly offset jockey wheel in order to properly engage the largest sprocket.

Ratio 2x12SH Upgrade Kit, mashup road SRAM 11sp and Shimano 12sp groupsets into SRAmano 12, new derailleur pulleys

The best part of this upgrade is that is less wasteful – requiring you to dispose of fewer usable parts. And that means it will be cheaper in the end, as well. The Shimano 12-speed cassette fits on your existing Shimano HG 11 freehub body. And the Shimano 12-speed chain still works with your existing 2×11 chainrings.

Huzzah!

Ratio 2x12SH Upgrade Kit – Pricing, compatibility & availability

Ratio 2x12SH Upgrade Kit contents

So, the next time your 11sp SRAM chain and cassette need to be replaced, why not make the leap to 12sp? The kit itself sells for just under £100 directly from Ratio now. That includes the ratchet & its mounting bolt, plus a new pair of slightly offset derailleur pulleys optimized for Shimano 12sp chains & cassettes.

Ratio mashup road SRAM 11sp and Shimano 12sp groupsets into SRAmano 12, upgrade old rim brake road bikes

The kit will upgrade any of SRAM’s 2×11 generation mechanical road shifters. Red, Force, Rival, or Apex – or even SRAM 10sp shifters if you add another internal upgrade Ratio offers. Then you just need a new Shimano 12sp cassette & chain – Dura-Ace, Ultegra, or 105 – which will work with your current chainrings and HG-equipped wheel.

Easy, peasy.

RatioTechnology.com

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blablabla
blablabla
5 months ago

So if I have Sram Apex 1 groupset (Apex shifter and derailleur + Shimano SLX 11-42 cassette), can I modify it with the set above to use with a micro-spline SLX 12s 10-45 cassette?

Ratio Technology
5 months ago
Reply to  blablabla

Unfortunately the Shimano Road and MTB cassettes are slightly different in their sprocket positions so this kit is specific to the Road cassettes. However, given you’d need to swap your freehub for this setup it might be worth checking our our 1×12 Road Kit with a SRAM XPLR cassette for very similar range 12 speed!

jason
jason
5 months ago

Shimano 12sp HG+ chain will really work with SRAM chain rings (even Eagle MTB chainrings?) and SRAM rear derailleur shift rollers/pulleys ???

Ratio Technology
5 months ago
Reply to  jason

Hi Jason, yes the Shimano HG+ chain works well on SRAM 2x chainrings despite the extended inner link ends. However, these extended inner link ends will interfere with the wide teeth of a 1x-specific chainring such as SRAM Eagle, so to use an HG+ chain with a 1x chainring you should choose a model with a tooth profile that’s been specifically designed for these chains, such as our newer Ratio Rings. HG+ chains use conventional 7.7mm diameter rollers so otherwise older tooth profiles will perform well. We provide new jockeys with the kit to adjust the geometry of the derailleur.

Greg
Greg
5 months ago
Reply to  jason

Shimano HG+ chains aren’t sensitive to 2x chainrings, only 1x narrow wide rings. Same with the pulleys. If the pulleys aren’t narrow wide, the chain will be fine.

Greg
Greg
5 months ago

so cool. I love what Ratio is doing!
I also love that slammed-ass stem on the Cervelo

David
David
5 months ago

That’s thinking outside the parallelogram. Reminiscent of when you could do that with Campagnolo internal ratchets.

Caspar
Caspar
4 months ago

Very interesting! So how about compatibility with SRAM road/gravel 12-speed? Would that necessitate another ratchet?

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