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Measured at the source.
Trying to decide which type of power meter is right for you demands considerable time and energy. Once you figure out what you want and how much you’re willing to pay, you have to delve into pages of proprietary terms and technology to figure out which products actually match that description. If you’re looking for dual-sided power metrics and are running a five-bolt 110mm BCD crankset right now, consider the PowerTap C1 Chainrings with Sensor. They won’t work with every crankset available, but offer a relatively wallet-friendly, dependable way to measure your watts if you have a compatible crankset already.
For this price, getting precise, individual left- and right-side measurements is asking a lot. However, the C1 system does split your stroke in half to give its best calculation of each side’s power, using built-in motion sensors to track cadence and power from within the unit. As you’re coasting through a steep descent, don’t worry about having to look down at your head unit and back-pedal; the system zeroes on its own as soon as you stop pedaling so that you can focus on the steep and winding road ahead. Compatible with Bluetooth SMART and ANT+, the C1 gets along with just about every major computer on the market too, so you won’t have to swap to a different head unit to see data while you ride.
- Chainring system measures power from your crankset
- Splits pedal stroke to approximate dual-sided power
- Zeroes-out on its own as soon as pedaling stops
- Compatible with major bike computers and head units
- Item #PAP000Q
- Q & A
Fail all around
- Familiarity: I've used it several times
Basically if you want crappy support and a crappy product prone to failure get this if not look elsewhere. If i could give a 0 star i would.
i bought these through another company and thought hey this should be perfect for what i need. Nothing could be farther from the truth. the first C1 i got failed in a month. I had initial issues with the Ant+ signal dropping out. Called Powertap support they said to move my ant+ receiver. AKA its your fault not ours. HMM ya not so much when a week later no signal for ant or bluetooth. Call them back they send a new C1 out. forget to include an RMA for me to send the other one back (Geniuses i swear). A week of using the new C1 and now similar issue happens. The device will transmit for about 20 seconds and then fails to stay on. Call Powertap back up go hey did this already did all your trouble shooting. They respond initially after 3 days. i email them back and its now coming up on a week later. In the email they asked why i ddin't send them back the other one and i tell them no RMA. Thank the company i purchased it from will refund me the money i paid and already gave me an rma label. They took a grand total of 5 hours to respond.
I won't buy a powertap, sarris, or cycleops now as they are all handled by the same company and their support sucks and apparently so do their products.