Poc launched new Propel sunglasses with the claim that they are “the most aerodynamic cycling sunglasses Poc has ever produced”, thanks in part to the addition of “side fairings” to the wrap-around lens – the better to help guide air away from the rider’s ears.
With Poc itself being less than precise about the exact aero gains, I did my best to put the Propels through a rigorous testing programme and see how they stack up against our other best cycling glasses. But in terms of how many watts are actually saved, unfortunately I don’t have any clearer a picture.
(Image credit: POC Sports)
Poc Propel: design
I doubt it was Poc’s intention – difficult to negotiate copywrites and all that – but I can’t get over the uncanny similarity between the Propels and Doc Brown’s mirror-shield visor glasses he dramatically dons as he and Marty set off to travel Back to the Future. Or, to be exact, these are probably the ones he would wear in the alternate version of 2015, it’s just taken a few extra years to get them to market.
Unlike Doc’s, Poc’s tech isn’t entirely in the wrap-around lens of the Propel. Much of it has to do with the close fitting and very subtle ‘trailing edge’ flaring of the sides of the frames which – according to Poc’s computational fluid dynamic modelling – reduces drag and turbulence around the rider’s ears. Designs as subtle as this make me wonder the effect on aerodynamics of different ear sizes and angles, side burn thickness and earring design. POC haven’t publicly said what watt savings a rider might expect although Poc’s head of global PR and communications Damian Phillips has gone on the record as saying “…we are seeing watt savings, typically in low single figures when riding at 40kph.”
For those who are keen to pursue every aerodynamic gain that is theoretically possible, one or two watts extra will be very attractive. I suspect the rest of us will be basing a decision of whether to buy on the vision and fashion credentials of the Propels.
The aero trailing edge and wrap around lens of the POC Propel sunglasses
(Image credit: Rachel Sokal)
Poc Propel: construction
The huge wraparound lens uses Poc’s Clarity technology for a clear view and sharp contrast. It also has a repellent coating for muck and moisture and an anti-scratch treatment. The standard lens is for road riding in mid-light…