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ROTOR Q-RINGS 9/10 Speed External Chainring 4 Arms 104 mm

ROTOR ROTOR
5.0 (1)
  • ROTOR Q-RINGS 9/10 Speed External Chainring 4 Arms 104 mm 0
€83.90
Recommended price*: €98.90
OUT OF STOCK
This item is a victim of its own success
Right to cancel within 30 days
Description

Rotor Q-rings are ovalized chainrings designed to reduce the negative effects of the 'dead spots' during a rider's pedal stroke. Because of the Q-ring shape, a rider is maximising their output over the larger size of the chainring and reducing energy used during the the small portion of the chainring. Q-rings maximise the use of your power and compensate for the least productive zones of your pedal stroke; they boost your capability, allowing your legs to generate smoother, more efficient propulsion with noticeable gains in endurance and performance.

Why are Q-rings the solution?

A round chainring tries to make your leg deliver a linear output, meaning that the legs have the same amount of resistance in the weak zones as they do in the power phase of the stroke, resulting in unhealthy joint strain, fatigue, lactic acid production and wasted energy. In addition, round rings do not add resistance where you are able to produce more power. At the end of the day, round chainrings hinder cycling performance and create unnecessary knee stress.

Pedalling power varies during the pedal stroke; the majority of power is delivered during the down stroke, with low to negative power during the rest of the stroke.

Q-rings were designed to counter this imbalance

When the power a cyclist generates is projected on a circular graph (commonly known as a "spin-scan"), we see clearly that every cyclist, recreational or professional, has a zone of distinct power defecit and a zone of clear power generation.

Q-rings are designed on a firm base of consistent, reliable data and are intended to vary the resistance in the drivetrain in line with our legs' ability (and inability) to deliver power; they make pedalling more effective, efficient, and a more natural process.

Q-rings: upgrade yourself
Q-rings don't make your bike better, they make you better. By having the drivetain maximise the use of your power and compensate for the least productive zones of your pedal stroke, they boost your capability - allowing your legs to generate smoother, more efficient propulsion with noticeable gains in endurance and performance.

Key features

Smaller diameter at the dead spots

  • More leverage to compensate for double weakness
  • Less time spent in the dead spots due to faster passage
  • Healthier muscle, tendon and joint loading
  • Compensates for lack of torque in these zones, reducing power void
Inertially efficient ovalisation
  • 10% ovality: subtle but efficient
  • Easy to adapt to: feels more natural than a round ring
  • Optimum biomechanical/inertial balance
Large diameter at the power base
  • Allows legs to stay in the power zone longer
  • Power goes to propulsion, not inertial pulses
Biomechanically coherent variation
  • Chainring size varies in line with the leg's immmediate potential
  • Smallest diameter at weakest point of spin-scan (start of thrust)
  • Reduced knee stress when bent and vulnerable
  • Maximum diameter at strongest point of spin-scan (maximum power transfer)
  • Loading comes from where knees are strain resistant
Compatibility
  • 110, 130, 135 and Campagnolo Compact BCD road cranks
  • 104/64, 120/80 and 110/74 BCD MTB cranks
  • Mechanical and electronic shift systems
What is the user experience?

Improved efficiency
  • Optimised leg effort gives feeling of power
  • Reduced strain and lactic acid production
  • Lower heart rate and oxygen consumption (VO²)
  • Improved climbing and cruising
  • Stronger sprints and acceleration (increased power output)
Benefits experienced
  • Reduced fatigue and faster recovery
  • Increased endurance
  • Naturally smooth spin that doesn't require concentration
  • Reduced knee strain (lower gear and top dead centre reduces load)
Bonus benefits
  • Mountain and cyclocross riders have improved traction
  • Triathletes optimise muscle build, improving bike and run split
OCP system: optimum chainring positioning

What does the OCP system do?

  • Adjusts the angle of the crank in 5-degree increment/decline (varying element) in relation to the chainring (stable element)
  • Ensures perfect chainring orientation irrespective of variables: upper leg length, lower leg length, cadence, saddle position, frame size, seat tube angle, hip-spine curvature
  • Customises the chainring's orientation to personal riding style
Why is the OCP system necessary?
  • Varying position on the bike: 73-degree road bike versus 78-degree triathlon bike
  • Varying pedal style and athlete build change the angle of max. power
  • To ensure minimum diameter at start of pedal stroke and maximum diameter at peak power
Colour: Black.

Weight (Probikeshop): 28 g.
Characteristics

Bolt Circle Diameter : 104 mm / 4 arm

Chainring type : Outer

Colour : Black

Material : Aluminium

Speed : 9, 10

Teeth : 42, 44

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Price information
*Recommended supplier selling price in January 2012
** By choosing express delivery Chronorelais or Chronopost
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