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No power meters for SPD pedals?

pbassredpbassred Posts: 208
edited December 2016 in Workshop
The simple answer would be to tell me that I'm wrong and suggest one. The second rate answer would be to tell me to use a crank system. Yes ok, but not the point.
Is there a reason why there are no pedal based systems for SPD pedals? I mean mountain bikers and Cyclecross think about power too (as well as doing the whole "walking" thing that roadies don't need to worry about).

Posts

  • dowtchadowtcha Posts: 433
    Look, Garmin, polar and Powertap are the major 4 pedal passed power meters at the moment. All 4 are based on the keo as the patent has run out so garmin, polar and powertap can use that platform and look can not stop them. To the best of my knowledge their is no spd-sl or spd as shimano still has the patent and wont allow it. All major powermeter companies offer MTB meters just not pedal based.
  • Would you want a PM in an MTB pedal? The risk of a damaged pedal is a bit too high, I think, for people to want to consider it.
    ROAD < Scott Foil HMX Di2, Volagi Liscio Di2, Jamis Renegade Elite Di2, Cube Reaction Race > ROUGH
  • NeXXusNeXXus Posts: 854
    No but crank arm and spider options exist
    And the people bowed and prayed, to the neon god they made.
  • Would you want a PM in an MTB pedal? The risk of a damaged pedal is a bit too high, I think, for people to want to consider it.

    That - I've worn the bearings and spindle out on 4 sets of pedals so far - I'd be raging if any of those sets also contained a power meter. Cranks on the other hand, I've worn out (or otherwise killed) precisely zero of those (I have replaced cranksets when chainrings have reached EOL - but only because the price difference between the big ring replacement and a whole crankset gave me the small ring and a spare set of cranks for buttons...)
  • A couple of other points. Current SPD pedals are very small and open-framed to aid mud clearance, so it would be hard to fit all the gubbins needed to measure power into the pedal. Also, on something like a Keo the strain gauges can directly measure the force applied through the cleat as the cleat bears the whole force applied by the foot when pedalling. In the SPD design the shoe also rests on the pedal and the cleat is more of a retaining mechanism, making the measurement of the pedalling forces difficult.

    To me, these factors, as well as the need to preserve the ability to clear mud and so on, suggest that the SPD design simply isn't suitable for use as part of a pedal-based power meter system.
    "an original thinker… the intellectual heir of Galileo and Einstein… suspicious of orthodoxy - any orthodoxy… He relishes all forms of ontological argument": jane90.
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