British brand Revolver Aeroworks is dedicated to designing aero equipment to make riders faster. Perhaps best known for its range of time trial wheels, Revolver also lends its hand to time trial extensions, armrests, extension wedges, and now, disc rotor fairings.
A recent post on Revolver’s Instagram unveiled the rotor fairings along with its official name: the Aeroto. The post explained that eagle-eyed triathlon fans may have spotted Revolver-sponsored athlete Joe Skipper testing the Aeroto in races last season. Having completed that testing, Revolver has now opened Aeroto pre-orders for both 140 mm and 160 mm rotor diameters.
“At the moment, we’re just letting people know it’s available soon and not giving away too much in terms of specification,” Revolver told us.
Revolver did confirm the Aeroto is a race day-only product, designed solely for front wheels and only on flat courses devoid of prolonged braking sections. Heat build-up is the obvious concern and a large part of the reason stock rotors are not smoother with aero surfaces out of the box. Rotor manufacturers are constantly looking at ways to dissipate heat, and the Aeroto covers most of the surface area around the middle of the rotor, which could lead to overheating and impaired performance on technical courses with increased braking demands. Revolver did say it has incorporated “design measures to help keep heating under control”, but it couldn’t elaborate any further on these at this time.
Another point of confusion is exactly how much aero benefit these covers offer. The aerodynamic efficiency of disc brakes is increasingly difficult to measure already. At first, the rotor and calliper combination was considered to be less aerodynamic than an aero-optimised rim-brake setup. However, with almost all development now focused on disc-brake frames and wheels, the aerodynamic penalty of a basic disc-brake setup is now claimed to be more than offset by the improved aerodynamics the overall system allows manufacturers to achieve elsewhere on the bike.
When asked precisely what aero gains the Aeroto can add to a disc-brake setup, Revolver was again somewhat limited in what it could say at this time, but did admit that the savings are marginal.
“It’s one of those marginal improvements that if you can apply in a few places around the bike you might grab five watts.”
Revolver went on to explain various testing methods have thrown up savings anywhere from zero to three watts, with Revolver’s own wind tunnel results somewhere in the middle of this range.
“We’ve been working with Joe Skipper for a while and this is just one of the items that is trickling down to the web site, but there are a few more that will likely emerge this year. We’re working hard for every possible watt, though.”
Don’t expect to see the Aeroto in any UCI time trials anytime soon (as it’s definitely not UCI-legal), but for the aero-minded local club time trial racer or the hotbed that is the UK time trialling scene, the Aeroto will surely be a hit.
Revolver is now taking pre-orders via Instagram DMs and is soon launching an Aeroto page on the Revolver Aeroworks web site. Pricing is yet to be confirmed.
More information can be found (eventually) at Revolverwheels.co.uk.