Amgen tour of California 2012

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First ride: SRAM S975 Quarq Power Meter crankset

  • A user-replaceable battery is a big plus for the Quarq unit. SRAM suggest most users will get around nine months of use before having to replace the battery.

    A user-replaceable battery is a big plus for the Quarq unit. SRAM suggest most users will get around nine months of use before having to replace the battery.

    Photo credit © Richard Tyler

  • Choice of SRM's Power Control head units does require an additional wireless sensor to pick up the speed. Choosing a Garmin as a head unit eliminates this due to their GPS capabilities.

    Choice of SRM's Power Control head units does require an additional wireless sensor to pick up the speed. Choosing a Garmin as a head unit eliminates this due to their GPS capabilities.

    Photo credit © Richard Tyler

  • SRAM's Quarq crankset saves some 36 grams over its SRM counterpart.

    SRAM's Quarq crankset saves some 36 grams over its SRM counterpart.

    Photo credit © Richard Tyler

  • A magnet mounted near the bottom bracket registers cadence.

    A magnet mounted near the bottom bracket registers cadence.

    Photo credit © Richard Tyler

  • The Quarq doesn't have a dedicated head unit. ANT+ compatibility makes Garmin's Edge 705 a front runner to fulfill the role.

    The Quarq doesn't have a dedicated head unit. ANT+ compatibility makes Garmin's Edge 705 a front runner to fulfill the role.

    Photo credit © Richard Tyler

  • Eponymous with power meters, SRM have joined forces with SRAM for 2010.

    Eponymous with power meters, SRM have joined forces with SRAM for 2010.

    Photo credit © Richard Tyler

  • The challenge of accomodating the power measurement hardware led SRAM to develop new unidirectional carbon fibre crank arms.

    The challenge of accomodating the power measurement hardware led SRAM to develop new unidirectional carbon fibre crank arms.

    Photo credit © Richard Tyler

  • The SRM's data is transmitted wirelessly via an inconspicuous sensor mounded beneath the bottom bracket. Both the SRM and Quarq versions of SRAM's crankset are compatible with the BB30 design.

    The SRM's data is transmitted wirelessly via an inconspicuous sensor mounded beneath the bottom bracket. Both the SRM and Quarq versions of SRAM's crankset are compatible with the BB30 design.

    Photo credit © Richard Tyler

  • SRAM's SRM is compatible with the Power Control 7 head unit. The soon-to-be-released PC8 will also mate with the cranks.

    SRAM's SRM is compatible with the Power Control 7 head unit. The soon-to-be-released PC8 will also mate with the cranks.

    Photo credit © Richard Tyler