The world’s lightest power meter isn’t cheap

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THM CARBONES Crank Clavicula SE Road Powermeter. (Photo: Supplied)
THM CARBONES Crank Clavicula SE Road Powermeter. (Photo: Supplied)
  • German engineers have slashed the mass of a crankset that can record your riding data.
  • Complex carbon-fibre layering and shaping makes the TRM power meter crankset much lighter than its competitors.
  • It is wildly expensive but tough and works in all weather conditions. 


Digitization has bought professional grade sports science, to amateur riders.

Enormous advances in digital sensors and better batteries, has enabled the harvesting of cycling data like never before.

Accurate rider output was once the preserve of professional cycling teams, with access to expensive computer software and sport science laboratories, but that is no longer the case.

The latest generation of compact and accurate power meters attach to your bike’s crank arms or chainring, harvesting all the data you would ever need to accurately track and analyse cycling performance.

Power meters are brilliant for those riders who obsess about their training, but they do add weight. And it is not only static mass. With the power meter connected to the crankset, you are working to spin that additional weight with every pedal stroke you take.

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For the price of a new bike, you can buy an exotic
For the price of a new bike, you can buy an exotic carbon-fibre power meter. (Photo: Supplied)

Reducing weight where it matters most

Experienced riders know that any saving in rotational mass (wheels, tyres, cranks) is of much greater benefit than saving static grams, by having a lighter frame.

In an attempt to balance the requirement for a sophisticated power meter and low crankset mass, there is the THM Clavicula SE road bike power meter.

An absolutely gorgeous carbon-fibre component, THM’s Clavicula SE crankset is impeccably engineered to be both strong and light. Very light. It weighs only 320g but can support a rider up to 120kg in weight.

Tracking your performance are strain gauges and a control unit module, sourced from Danish cycling electronics specialist, Sensitivus. As you spin along the power meter measures your cadence, torque output and pedal stroke smoothness.

Downloading the data is easy, via Bluetooth or ANT+ transmission protocols. The battery lasts 150 hours of riding and is easily replaceable.

You can use the Clavicula SE in all weather conditions as the power meter and its electronics are waterproofed to the IP67 standard, which means you won’t ruin it, riding through a highveld thunderstorm.

THM’s German carbon-fibre expertise does not come cheap. At R35 000, it is a lot of money to pay for a crankset with some data monitoring electronics, but as with all things in cycling, reducing weight comes at a significant price premium. 

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