Cotic Rocket Frame + Drive System
Cotic Rocket Frame + Drive System
Rocket: full power e-MTB that rides like a Cotic
That matters more than it sounds. Most e-bikes, however capable or powerful, feel different from a regular mountain bike in ways that are hard to ignore. Heavier. More planted. Less willing to change direction when you ask. The Rocket doesn't feel like that. It feels like you on a great day, stronger, fresher, and more capable, without surrendering the natural rhythm and responsiveness that makes mountain biking worth doing in the first place.
A slim T45 down tube, rather than a drainpipe-sized chunk of metal or carbon, means the Rocket retains genuine chassis flex and feedback. That life, that Cotic feel, is what the steel frame preserves, even with a motor in the mix.
The new Shimano EP810 ebike power system is their top of the range, lightest, most powerful motor, intuitive and natural feeling, and highly configurable. The external battery means the down tube stays slim and responsive, with hot swapping and simple charging, and perfect weight distribution for predictable traction and precise turn-in.
100% of the frame is made and sourced in the UK, at Five Land Bikes in Scotland, with the aluminium swingarm and CNC machined parts from hand picked UK makers. Custom A La Carte paint is included as standard, no separate upgrade needed.
Range and Performance
EP810 brings 650W and up to 100Nm of torque bring as much punch as any rider could want, and the latest adaptive power setting just makes it feel like you on a great day, everywhere, without constantly scrolling power settings. If you opt for integrated Shimano Di2 electric shifting, you have the option of automatic shifting as well, and the Freeshift function that allows you to shift whilst freewheeling, which is incredibly useful.
With the 504Wh battery, 1000-1200m vertical is easily achievable with using low to medium power modes. Up that figure to nearer 1400-1500m using the 630Wh.
Using higher power modes and ripping up steep climbs, you are looking at more like 800m on the 504 and 1000m on the 630.
On easier going terrain the batteries really last a long time. Cy did a ride in rolling countryside with a total of 800m of vertical, 83km travelled on the 630Wh battery, and still had 17% battery left at the end. On the other hand, riding at the Golfie in Scotland, in Boost up the fireroad climbs, we emptied the 504Wh battery in 2.5 hours, but that was still over 1000m vertical.
Read the full story of how we developed the Rocket →
What's included
- Cotic Rocket Frame
- Rear Shock
- Shimano EP810 Drive System and External Battery
- Front and Rear Thru Axles
- All Hose Clips and Guides
Features
- Radical Cotic Longshot geometry, specifically designed for super short 35mm stems, giving incredible steering responsiveness combined with hugely confidence inspiring capability at speed. Proportional C-Sizing brings consistent balance across all sizes.
- 150mm Rocklink suspension brings traction, fun and interaction via a strong progression rate.
- Reynolds 853, Cotic exclusive Ovalform top tube and HD seat tube, combined with motorsport-derived T45 down tube, builds a precise, durable and strong front end with beautiful ride feel.
- 44mm standard head tube designed with external bottom cup for taper steerer compatibility and angleset compatibility.
- Bespoke, Cotic engineered motor yoke saves nearly 1kg.
- External battery power system for super quick battery swap, convenient off-bike charging, and multiple battery ride possibilities, leaving the down tube slim for gorgeous steel ride feel.
- 6082-T6 UK made aluminium swingarm with Syntace X-12 BOOST148 x 12 rear axle and UDH hanger.
- Mostly external routing with bespoke 3D printed cable management.
- Cotic exclusive Floating Trunnion shock mount maximises shock life and sensitivity.
- Enduro MAX and SKF bearings for long life and highest performance.
- Adaptable geometry: 150mm fork for trail, 160mm fork for enduro.
- Five sizes, C1 to C5.
Make it yours. On this bike you can choose A La Carte custom paint. A La Carte frames are painted to order right here in the UK, just a few miles from Cotic HQ.
Choose your frame colour and decal colour from our list of tried and tested paints, and choose a matte or gloss finish.
- Custom paint is included in the price of every Rocket.
Availability by size
- C1 Due March 2027
- C2 Due March 2027
- C3 Due March 2027
- C4 Due March 2027
- C5 Due March 2027
Prefer to pay a 20% deposit, or want to change the spec? Add it to your basket and choose Place Provisional Order, or call us on 07970 853 531. Nothing is charged until we've agreed your build.
- Free UK delivery. Europe: £150 for bikes, £40 for frames. No UK VAT is charged to Europe; you pay import VAT and any duties and fees on delivery
- Built and checked before dispatch — front wheel, bars and pedals to fit
- Available via Cyclescheme, Green Commute Initiative or Cycle Solutions
Choose your build
Rock Shox Lyrik E1 Select Black - 150mmCues ebike 1x11 Linkglide Drivetrain
Rockshox Lyrik UltimateShimano Deore XT Mechanical 8200
Fox 38 Factory Kashima GRIP X2 - 160mm BlackXTR ebike Di2 Wireless Drivetrain 1x11 Linkglide
Upgrade your build
Add any of these alongside your bike, they'll show as a separate line in your basket.
Custom paint is included in the price. Choose your frame colour, decal colour and finish from our paint list.
We'll confirm your choices with you before painting.
Origin
MADE IN BRITAIN
Cotic frames are designed, developed, engineered and tested entirely by us at our base in Chesterfield, on the edge of the Peak District in the UK. Our founder - Cy Turner - is the lead designer and engineer, and our frames are rigorously ride tested by everyone at Cotic and chosen test riders and ambassadors. The Rocket is fully certified and lab tested to EN15194, the safety standard for electrically power assisted cycles.
The Rocket frame is 100% UK made. The skilled guys at Five Land Bikes in Scotland manufacture the front triangle in custom Cotic designed Reynolds 853, T45 and Ventrics high strength steel, and the T45 seatstays, in small batches, to their exacting standards. The aluminium swingarm and CNC machined parts come from hand picked UK makers.
The frames are ED Coated to prevent corrosion, before being painted using tough and durable automotive spec paint by the Five Land guys. After they have completed their painstaking hand finishing process and their rigorous QC, the frame parts undergo further checking by us before assembly in the workshop at our HQ.
Sizing & geometry
| Frame Size | C1 | C2 | C3 | C4 | C5 |
|---|---|---|---|---|---|
| Seat Tube (centre-top) | 380 | 407 | 435 | 450 | 465 |
| Top Tube Length (effective) | 595 | 616 | 632 | 653 | 674 |
| Head Angle | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° |
| Effective Seat Angle (at 700mm BB-saddle height) | 76.5° | 76.5° | 77° | 77° | 77° |
| Effective Seat Angle (at 815mm BB-saddle height) | 76.3° | 76.3° | 76.7° | 76.7° | 76.7° |
| Chainstay Length | 450 | 450 | 456 | 456 | 456 |
| BB Drop (from front wheel) | 40 | 40 | 40 | 40 | 40 |
| Head Tube Length | 100 | 110 | 120 | 130 | 140 |
| Reach | 444 | 463 | 482 | 501 | 520 |
| Stack | 630 | 639 | 648 | 657 | 666 |
| Wheelbase | 1225 | 1248 | 1277 | 1300 | 1324 |
| Stem Length | 25-45 | 25-45 | 25-45 | 25-45 | 25-45 |
| Frame Wheel Travel (55mm stroke shock) | 150 | 150 | 150 | 150 | 150 |
| Wheel Size | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R |
| Max Rear Tyre Size | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" |
| Max Seatpost Insertion | 298 | 316 | 347 | 362 | 377 |
All measurements static, based on a 150mm travel fork.
| Frame Size | C1 | C2 | C3 | C4 | C5 |
|---|---|---|---|---|---|
| Seat Tube (centre-top) | 380 | 407 | 435 | 450 | 465 |
| Top Tube Length (effective) | 596 | 617 | 633 | 654 | 675 |
| Head Angle | 64° | 64° | 64° | 64° | 64° |
| Effective Seat Angle (at 700mm BB-saddle height) | 76° | 76° | 76.5° | 76.5° | 76.5° |
| Effective Seat Angle (at 815mm BB-saddle height) | 75.8° | 75.8° | 76.2° | 76.2° | 76.2° |
| Chainstay Length | 450 | 450 | 456 | 456 | 456 |
| BB Drop (from front wheel) | 36 | 36 | 36 | 36 | 36 |
| Head Tube Length | 100 | 110 | 120 | 130 | 140 |
| Reach | 438 | 457 | 476 | 495 | 514 |
| Stack | 635 | 644 | 653 | 662 | 671 |
| Wheelbase | 1231 | 1254 | 1283 | 1306 | 1330 |
| Stem Length | 25-45 | 25-45 | 25-45 | 25-45 | 25-45 |
| Frame Wheel Travel (55mm stroke shock) | 150 | 150 | 150 | 150 | 150 |
| Wheel Size | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R | 29in F / 27.5in R |
| Max Rear Tyre Size | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" | 27.5 x 2.6" |
| Max Seatpost Insertion | 298 | 316 | 347 | 362 | 377 |
All measurements static, based on a 160mm travel fork.
Photos
Component sizes
For fitting your own parts, or checking compatibility before you buy.
- Seatpost diameter
- 31.6mm. See geometry tables for maximum insertion.
- Front Mech
- Not applicable, 1x drivetrains only
- Fork
- Maximum 160mm travel for 29" wheel, 576mm axle-crown (without sag)
- Rear Wheel
- 27.5"/650B wheel. Maximum width 2.6". Maximum diameter 725mm
- Bottom Bracket width
- N/A, Shimano STEPS ebike
- Bottom Bracket thread
- N/A, Shimano STEPS ebike
- Chainline
- 52mm Shimano, 34t chainring
- Chainguide Mounting
- Shimano STEPS
- Headset
- 44mm for taper steerer forks: Hope 2H, Cane Creek ZS44 top/EC44 bottom, or Chris King Inset I7
- Rear Hub
- Boost148 x 12 bolt through
- Rear Axle
- Syntace X-12
- Rear Mech Hanger
- SRAM UDH
- Shock
- 185x55 Trunnion Mount, air or coil shock compatible
- Shock Fittings
- Trunnion Rocker, 30.0 x M8 frame end
- Dropper Post Routing
- Internal via down tube port
- Rear Brake Mounting
- I.S., maximum 203mm diameter rear disc
Not sure which Cotic is right for you?
Answer a few quick questions about your riding and we'll suggest the bike that suits you best.