Knee bend under 60 degrees

Retroflex RX2 or RX3

Knee bend over 60 degrees

Retroflex RX2 or RX3

Recreational trails and road

Retroflex RX2, RX3 or Comfort cranks

Rehab following surgery

Retroflex RX2 (Exercise Bike or Static Trainer)

Sport Road

Retroflex RX3 or Custom cranks

MTB off road

Retroflex RX3 or Custom crank.
(Retroflex RX3 is not suitable for jumps or stunts)

Touring

Retroflex RX2, RX3 or Comfort cranks