PowerTap C1, G3S and Joule GPS - first look

Power meter chainrings, GS hub and Joule GPS+ computer arrive

PowerTap’s new product blitz is led by the new P1 power meter pedals and continues with the C1 power meter chainrings, GS hub and Joule GPS+ computer. Here’s what you need to know about each one.

C1 chainring power meter

The C1 chainring power meter costs just £569 / US$699 / AU$1,100, making it the cheapest power meter on sale (except in Australia), even undercutting the single-sided systems from Stages and Garmin. It has five strain gauges, one at each mounting tab, and a transmitter pod tucked neatly between the crank arms.

PowerTap's c1 chainring power meter comes in cheaper than single-sided options from stages and garmin: powertap's c1 chainring power meter comes in cheaper than single-sided options from stages and garmin
PowerTap's c1 chainring power meter comes in cheaper than single-sided options from stages and garmin: powertap's c1 chainring power meter comes in cheaper than single-sided options from stages and garmin

PowerTap's C1 chainring power meter is the cheapest option on the market

The C1 can run with 10- and 11-speed setups but initially it is only available for five-arm 110BCD cranks. PowerTap says that it chose this size because it’s the most common currently on the road, if not in showrooms. It’s likely that more sizes will follow to suit the latest four-arm Shimano systems, but the placement of the strain gauges means it isn’t straightforward.

The chainrings are made by FSA and come in 53/39, 52/36 and 50/36 sizes. A 34-tooth inner ring isn’t possible due to the placement of the pod. As well as being an introduction to training with power, the C1 also opens up the possibility of OEM fitment on new bikes. Specialized recently became the first manufacturer to spec a power meter as standard on the new Venge Vias.

Joule GPS+ computer

The new Joule GPS+ computer adds mapping, guidance and customisation of the display in order to put up a stronger fighter to Garmin. The screen shows between three and six data fields, plus the maximum and average of the selected main field.

The new joule gps+ computer adds mapping, guidance and customisation of the display: the new joule gps+ computer adds mapping, guidance and customisation of the display
The new joule gps+ computer adds mapping, guidance and customisation of the display: the new joule gps+ computer adds mapping, guidance and customisation of the display

The new Joule GPS+ computer uses PowerTap's own Power Agent software

One feature we really like is ‘proximity pairing’ which finds the nearest power meter. If you’ve ever had to flee to the far corner of the car park at an event because your Garmin keeps telling you ‘multiple power meters found’ then you will appreciate the value of this idea.

PowerTap has its own software, called Power Agent, which provides all of the usual analysis tools. While the display looks a little behind the latest Garmin 1000, pricing for the Joule GPS+ starts at just £175 / US$249 / AU$300.

GS power meter hub

The new GS power meter hub is a collaboration with DT Swiss, which provides its 240s hardware. The hub uses 24 straight pull spokes, 12 each side, and DT’s Ratchet System, bearings and toolless freehub swap.

The GS is compatible with 9-, 10- and 11-speed drivetrains from Shimano, Sram and Campagnolo. The claimed weight is 320g and will cost £699 / US$839 / AU$TBC, a premium of £50 / US$50 over the regular G3 hub.

The disc-specific version of powertap's new gs hub includes a brake rotor: the disc-specific version of powertap's new gs hub includes a brake rotor
The disc-specific version of powertap's new gs hub includes a brake rotor: the disc-specific version of powertap's new gs hub includes a brake rotor

The G3 Disc hub is new

There is also a new G3 Disc hub (£899 / $990 / AU$900)  which offers 135 quick release or 142 x 12mm thru-axle compatibility. This also features either 34 or 28 hole straight pull spoke flanges, but does not use DT Swiss internals.

Jamie Wilkins

Deputy Editor, Procycling / Editor, Urban Cyclist, Procycling Magazine
Rides fast everywhere, all the time. Jamie started riding age 12, first on mountain bikes, progressing through cross-country and downhill racing (followed by motorcycle road racing and a dark time as a runner). A dedicated roadie since 2007, Jamie has dabbled in road racing, crits and time trials, but has the most fun simply riding hard with a couple of friends, chasing daft average speeds. Needless to say, Jamie values pure performance above all else and loves aero kit. Fiercely honest in his reviews. Has a chain-cleaning fetish.
  • Discipline: Road
  • Preferred Terrain: Mountains, rolling stuff, flat and windy, hacking through the city…
  • Current Bikes: Ridley Noah SL 20, Scappa Purosangue, Canyon Speedmax 9.0 SL
  • Dream Bike: Canyon Aeroad CF SLX 9.0 LTD, in red, please. And a Pashley Guv'nor.
  • Beer of Choice: Recovering teetotaller, still working this one out
  • Location: Bath, UK

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