Bicycle Mixed Wheel platform

Scrub Radius and Force Vectors

Design and Tune

Scrub Radius and Force Vectors Defined:

Copy Right 2013 Mullet Cycles LLC

Scrub Radius (As we applied it to the bicycle): Relates to the measureable turning arch of the rear wheel that’s created when the front wheel is turned.

Force Vectors (As we applied it to the bicycle): When the front wheel is turned, it generates a vector angle. This affect generates a Force on the front wheel, felt as “Push” from the force generated by the rear wheel.

*See line drawn from the center front wheel to the center of the rear wheel as seen from the top of a Bicycle. (Figure 1, Line A)

When wheels are symmetrical the Scrub Radius and Force Vectors (a measurable arch) are negatively increased. Force Vectors applied on symmetrical wheels are increased as center line pull forces are decreased. On mixed wheeled platforms forces are positively decreased. In addition to this, anti tip properties are benefited and BB levels can be significantly improved. 

Different Wheel Diameters, Different Jobs, Better Performance

Larger Front wheel = Superior Rolling Resistance / Steering Traction Forces  /  Optimized Force Vector Tuning

Smaller Rear Wheel = Increased Powered-Torque  /  Driving Traction Forces / Optimized Scrub Radius Tuning 

When mixed wheel geometry is optimized we achieve maximized pedal-power efficiency while still maintaining the safest descending position.

Greg Hodges/Element Cycles
Greg Hodges/Element Cycles

*Benefits of riding a Mullet

-Better Cornering as a result of a properly mixed wheeled ratio design.

-Better Anti-Tip (safer) while still maintaining optimum ergonomic pedal-power positions.

-Constant Attack position/posture resulting in safer and better control of the bicycle.

-Optimized BB Heights greatly decreases pedal strikes.

-Wider range of speed handling through an optimum head angle position.

-Smaller rear wheel reacts quicker due to lighter weight and smaller diameter

-Smaller rear wheel is stronger, has less gyroscopic force and is able to transmit greater Torque

-Better Air Control and Stability due to a differential gyroscopic affect.

-Larger front wheel diameters optimally roll over obstacles, has a larger steer contact patch resulting in greater trail traction

-Limits the Push/Pull affect when entering, holding, and exiting corners.

The ultimate Mountain Bike Platform: Mullet