Ratio Technology

Ratio Technology Ratio Technology was founded in 2018 by Cambridge Engineers Tom Simpson and Felix Barker. Our aim is to develop ground-breaking drivetrain components.

We’ve set our minds to creating the parts we want to ride on our own bikes. We hope you enjoy them.

We're in awe of this. Top notch bike build & photography.Hero shots of a hero bike, hand crafted by the folk at in the...
21/05/2026

We're in awe of this. Top notch bike build & photography.

Hero shots of a hero bike, hand crafted by the folk at in the UK.

Fresh for the .cc show and featured by on ,
this is the totally rad Cotic Jeht Gen3.

Hand-built in the UK and here rocking the Ratio Mech. Configured in its UDH guise with silver and black colourway, it's motivating to see a high-end steel whip designed around high-end mechanical transmission.

Check out the Ratio Mech for your dream build.

09/05/2026

A deep dive into Ratio product manufacturing!

Welcome to 3 minutes of dropper lever machining with engineering insights from chief Tom.

This machine lives in our Lake District workshop and, amongst many uses, transforms aluminium stock into dropper levers ready to fit onto your bike.

Check out the range of tools and design thoughts involved to operate a cutting, drilling, paring, tapping machine, all in 5 axes of play!

Install the dropper lever in your left SRAM shifter, cinch up your dropper cable, and you're ready to rip.

Thia is perfect for riding gnar on your lightning quick gravel bike, with the rowdiness of a dropper post.

Bikes of The Gralloch. Returning to Scotland on 15th May 2026.What Ratio kit can you spot? Stickers, chainrings, bottles...
05/05/2026

Bikes of The Gralloch.

Returning to Scotland on 15th May 2026.

What Ratio kit can you spot?

Stickers, chainrings, bottles, derailleur cages, 1x12 conversion kits 👌

Tag us in your Ratio gravel bike race build pics 📸

Our new chainrings for Shimano GRX. Launched in March 2026. These are the only 34t rings for GRX on the market. Exclusi...
30/04/2026

Our new chainrings for Shimano GRX. Launched in March 2026.

These are the only 34t rings for GRX on the market.

Exclusive to Ratio Technology: Your ideal setup for steeper, gnarlier gravel.

Compatible with 11,12, and 13 speed, these are the chainrings to keep you ahead of the curve and on top of your power.

Plus, they feature our tooth profile design to work perfectly with all chain manufacturers.

Available in 34t, 36t, and 38t.

We love riding them, and we know you will too.

28/04/2026

Check out the beauty of this freshly machined dropper lever component.

Machined theatrically from a matchstick sized aluminium block to a refined, gorgeous piece of tech in 9 mins 36 seconds.

Ready to be snapped off from the base, hence the thin lower legs.

We machine all our metal parts in-house in the Lake District. This machine is the HAAS, a 5-axis CNC behemoth.

Machining in-house means we can prototype instantly, react to new bike tech, and see a finished product in minutes.

This component forms the top part of our Dropper Lever. Where it attaches into your SRAM shifter hood, to transform your drop bar bike into a sending machine.

We’ll now anodise it blue and reload the HAAS to churn out the lever itself!

recently shared photos of this stunning custom Stavanger build featuring our Drop Dropper 12 lever.We machine this drop...
24/04/2026

recently shared photos of this stunning custom Stavanger build featuring our Drop Dropper 12 lever.

We machine this dropper lever to install seamlessly into your left SRAM mechanical shifter.

We've concluded that dropper posts on gravel bikes wholly push the boundaries of what a rigid bike can do.

Head to ratiotechnology.com to take your gravel to a new level.

We designed the Mech to be entirely serviceable with a multitool. We don’t use rivets, circlips, or safety screws. Every...
20/04/2026

We designed the Mech to be entirely serviceable with a multitool.

We don’t use rivets, circlips, or safety screws. Everything is held together by hex sizes 2mm, 2.5mm, 3mm, 4mm, 5mm, 8mm, and T25.

We built-in this inherent serviceability to give you the right to repair - to reduce waste and extend your Mech’s lifespan.

So if a part breaks, order a replacement and swap it out with ease, whether at home or halfway round the world.

And if you want to swap from a short to long cage, or from hanger mount to UDH, it’s all designed for at-home servicing. So that your Mech works for you.

The Ratio Mech is currently the only way to use road shifters with a direct mount mechanical rear derailleur.Converting ...
19/04/2026

The Ratio Mech is currently the only way to use road shifters with a direct mount mechanical rear derailleur.

Converting your mountain bike to a monster gravel? Or wanting a wider range of gears to get up the hills? Simply fit the Mech and find the right setup for where you ride.

We also have 12 and 13 speed ratchets that you can fit in your old shifters, upgrading them to work with your new setup.

Head to ratiotechnology.com to find the full breakdown of setup options for the Mech.

17/04/2026

Dales Divide Bike Check

The dust has settled after 600km of riding in proper Yorkshire conditions. Check out Mark's bikepacking race setup.

The Ratio Mech on his Planet X Tempest stood up to everything Storm Dave could throw at it. After 3 days of bog, mud and heavy rain, it was still shifting as well as it did at the beginning.

"Buttery smooth, and that quality held up over hundreds of miles."It's been really nice to see this one out in the wild ...
16/04/2026

"Buttery smooth, and that quality held up over hundreds of miles."

It's been really nice to see this one out in the wild - just published their full review of the Ratio Mech.

- “It might be one of the lightest-action derailleurs I’ve ever operated”
- “Crisp, quick, and consistent”
- “A well-balanced level of tension and control that feels just right for mountain biking"

We were particularly pleased to hear Logan's appreciation of our tool-free Cage Stop, for easy wheel removal: "It felt rock-solid and intuitive. It’s a smart, well-executed design."

Full review link in our profile, or head to .com to see the full specs 👆




The Ratio Mech is now available in silver!Precise, reliable and fully user-serviceable mechanical shifting, plus we thin...
14/04/2026

The Ratio Mech is now available in silver!

Precise, reliable and fully user-serviceable mechanical shifting, plus we think it looks pretty great in its new colours.

's Trek Top Fuel is ready to rip the local trails here in the Lakes.

Head to .com for more options.

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