Cratus Mk2 Crank - Straight
Product Information
The Cratus Mk2 crankset has been engineered for maximum efficiency, optimising aerodynamics, biomechanical performance and stiffness. An adjustable crankarm length system allows precise positional tuning via interchangeable inserts, with adjustment ranges of 145–160 mm (short arm) and 160–175 mm (long arm). This modular design also simplifies bike fitting and aero testing.
A class-leading 125 mm Q factor improves both biomechanical efficiency and aerodynamic performance, while the 144 BCD interface minimises chainring flex.
The Cratus Mk2 is compatible with all major pedal systems and a wide range of bottom bracket standards.
For full details on spindle lengths, Q factor, chainstrike and compatibility, please refer to our fit calculator.
Performance Benefit
Tested savings of 0.001–0.002 m² CdA per 10 mm Q-factor reduction, depending on rider.
What It Is
Modular aero crankset with adjustable crank lengths and interchangeable spindle options.
Best For
Track, Time trial and triathlon riders seeking maximum aerodynamic and biomechanical optimisation.
Compatibility
Compatible with DUB bottom brackets and a wide range of frame and pedal systems. Find Cratus fit calculator in teh URL https://www.shopforwatts.co.uk/pages/crank-fitment-calculator?_pos=1&_psq=crank+fit&_ss=e&_v=1.0
Why Cratus?
Developed for World Hour Record performances and engineered to optimise aerodynamics, biomechanics and drivetrain efficiency
Technical Specifications
FITMENT CONSIDERATIONS
There are two main aspects which need to be considered. Crankarm to chainstay clearance and chainstrike. The latter is between the chain and crankarm when in the smallest sprocket of your cassette.
Please refer to our fit calculator. The dimensions provided will help provide crankarm position relative to the frame centreline; from this, you can work out chainstay clearance.
Secondly, the fit calculator also provides a chainstrike clearance estimate. This is based on your input parameters.
OTHER CONSIDERATIONS
- A 58t chainring is the smallest compatible chainring size.
- For road use, 2x compatibility is not possible.
WEIGHT
- 160-175 DS crank inc dome = 425g
- 160-175 NDS crankarm = 201g
- 145-160 DS crank inc dome = 400g
- 145-160 NDS crankarm = 192g
- DUB Spindle (Ultra-Narrow) = 70g
- DUB Spindle (Narrow) =73g
- DUB Spindle (Standard) = 77g
- Pedal Inserts (inc plates) = 35g/pair
SYSTEM WEIGHT (160-175mm + Narrow Spindle) = 734g
What's Included
A full crankset comprises of the following.
1x pair of crankarms (DS and NDS)
1x DS cover
1x DUB spindle (ultra narrow, narrow or standard)
2x retention bolts (DS + NDS)
1x DS retention bolt removal bolt
1x pair of pedal inserts and plates
Optional Items:
Pedal puller
30mm-to-DUB adapters
All required mounting hardware, included.
More information can be found on each components page; spindles, pedal inserts, pedal puller and 30mm-to-DUB adapters.
