Power meters going mainstream

Doug3

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Jun 24, 2010
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www.tokyocyclingcoach.com
SRAM moved pretty quickly on their acquisition of Quarq, turning out what looks like will be a nice piece of kit with their new Red series.

http://www.sram.com/sram/road/products/sram-red-quarq-powermeter-2012
http://quarq.com/sram-red-quarq-power-meter

I hope with SRAM's manufacturing experience they can deliver robust and reliable power measurement, at a reasonable price eventually. 2,000USD list at this point seems like they must be planning on making a decent profit with them. Hope this helps to push the prices down rapidly over the next several years.
 

Sikochi

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Sep 13, 2010
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Maybe it will force Shimano`s hand at last. Can`t believe they can perfect electronic shifting and not a Dura Ace crank with inbuilt power-meter.
 

GSAstuto

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Oct 11, 2009
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You guys could make your own. Glue a couple of strain gauges on the cranks and use a combined voltage wheatstone bridge with low noise amp. Then a AD converter into an Arduino to provide a interface to an F24AP1 transceiver. yes, it should be no problem for a company the size of Shimano to do this - see, in less than 5min and 3 drinks of red wine, here is a basic architecture that will work fine. The only 'gotcha' is measurements between cranks - but - oh! Shimano makes that easy - they have a hollow spindle - so you could route the wiring though / into the center spindle. Actually, all the electronics could probably be stuffed in there as well..

Maybe it will force Shimano`s hand at last. Can`t believe they can perfect electronic shifting and not a Dura Ace crank with inbuilt power-meter.
 

Yamabushi

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You guys could make your own. Glue a couple of strain gauges on the cranks and use a combined voltage wheatstone bridge with low noise amp. Then a AD converter into an Arduino to provide a interface to an F24AP1 transceiver. yes, it should be no problem for a company the size of Shimano to do this - see, in less than 5min and 3 drinks of red wine, here is a basic architecture that will work fine. The only 'gotcha' is measurements between cranks - but - oh! Shimano makes that easy - they have a hollow spindle - so you could route the wiring though / into the center spindle. Actually, all the electronics could probably be stuffed in there as well..
Sounds like the makings of the new GSAstuto power meter! :cool:
 

GSAstuto

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Surprisingly I built something very similar to this back in the 80's - except it was to do dynamic weight for helicopter hooks. And we didn't have Arduinos - had to use a 68xxxx. But it was fine. The fact is , that this is not so difficult and expensive to do .. so as Sikochi says, why isn't Shimano incorporating (or making) a standardized power meter interface?? With 25yr newer technology - trust me, it's much simpler and less expensive!