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SRMCampagnolo 4-Bolt Powermeter Crankset

$2,499.00

Item # SEM000F

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  • 172.5mm, 52/36T ($2,499.00)
  • 172.5mm, 53/39T ($2,499.00)
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Item # SEM000F
Description

Campagnolo 4-Bolt Powermeter Crankset

SRM pioneered the crank-based power meter way back in 1987, and has continued to set the standard by which the rest of the industry follows ever since. The SRM power meter boasts an exceptionally precise accuracy window of less than one percent, making it the virtually unassailable bench mark for measuring power in research settings. Paired with Campagnolo's carbon fiber crank arms, the SRM Campagnolo 4-Bolt Powermeter Crankset delivers impeccable power transfer, accurate measurement, and a dash of Campy style. But don't take our word for it; just watch the final two mountain stages of 2016's Giro to see what a guy like Nibali can do with this here crank apparatus.

SRM measures torque with four measuring bridges along the spider in the heart of the crankset to capture data at the transfer point between the crank arm and chainring, which is then plugged into an equation along with pedal velocity to determine power output. With a less than +/-1% accuracy window and a reading range of zero to 4,200 watts, rest assured that you're getting the right readings to keep your training on track.

Although the crankset looks strikingly similar to Campagnolo's standard Record crank, it does have some differences. SRM worked with Campagnolo to develop a custom carbon fiber crank arm that integrates seamlessly with the SRM spider. Despite this necessary difference, the SRM Campagnolo crankset still features the renowned Cult bearings, which Campy claims enjoy 3.5 watts of improved pedal efficiency with each pedal stroke and the lowest coefficient of friction available courtesy of the perfection of ceramic bearings and Campy's top-tier races. The crank arms are essentially Record crank arms minus the Record spider, so they're made with the same Ultra-Hollow technology to deliver exceptionally light weight yet impeccably stiff power transfer.

The SRM Campagnolo 4-Bolt Powermeter Crankset was designed to pair with SRM's separately sold Powercontrol head units, but is also compatible with other ANT+ head units to record data and save files for review on your favorite training data analysis software. While we can't in good conscience recommend taking these crank arms (or any other power meter) swimming, SRM specifies that the system is sealed to prevent water or debris from working its way in and gunking things up.

A side effect of this closed system is that the battery is not accessible to the user, which necessitates sending the unit to SRM for replacement when it runs out. The good news is that its claimed battery life of 1900 hours means even the most prolific cyclist won't have to worry about this minor inconvenience more than about once every few years.

  • SRM and Campagnolo work harmoniously to bring you ultimate power measurement
  • Spider-based power meter with a custom made crankset for elite performance
  • 144-point calibration protocol ensures an unmatched ±1% measurement accuracy
  • Unidirectional carbon fiber crank arm delivers power to the axle
  • Approximately 1400 hours of ride time keep you churning those watts
  • SRM power meters stand as scientific benchmarks for accuracy and reliability

Tech Specs
Arm Material
unidirectional carbon fiber
Arm Length
172.5mm
Chainring Sizes
50/34t, 52/36t, 53/39t
Bolt Circle Diameter
145mm, 112mm
Bolts
4 bolts
Rings
2 ring (Campy XPSS)
Q Factor
145.5mm
Compatible Components
Campagnolo 11-sp
Recommended Use
road cycling, cyclocross, gravel, triathlon
Manufacturer Warranty
3 year
Weight

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

Grams

Oz

172.5mm, 52/36T
793g
27.97oz
172.5mm, 53/39T
544g
19.19oz

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

780g

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    What do you think about this product?

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    >Rating: 5

    Still the Standard

    Familiarity:
    I've put it through the wringer

    It is very hard to make the case of spending nearly $1,000 more on an SRM, than a Quarq, Pioneer, Powertap, or any of the other rapidly accumulating options on the market. I even have a hard to explaining why or how SRM makes a better product; they do! The best way that I can describe this is if you want to be able to install your power meter and never have to worry about it functioning through your next ride; SRM is the solution. There is a reason why the best cyclisits in the world insist on SRM; because it is the solution that is guaranteed to work all day, everyday, and to do so flawlessly. Simply put, this is the professional solution. Add the performance of SRM with a Campagnolo super record crank, and the flawless shifting of their chainrings, and you have the best possible power meter that money can buy for your Campagnolo drivetrain. If you have any questions, feel free to get in touch with me directly. Bradley Gehrig Customer Account Manager bgehrig@backcountry.com 801-204-4541