This acts on the pistons in the brake calliper to push the brake pads against the disc rotor. Pulling the brake lever in a hydraulic system moves a piston inside the master cylinder which forces brake fluid towards the brake calliper. Mechanical systems are operated by a cable, like the vast majority of rim brakes, while hydraulic systems use fluid to transfer the force from the lever to the calliper. You can divide disc brakes up into two types: mechanical and hydraulic. Linked to that, a side benefit of disc brakes is that your wheel can go out of true without rubbing on the brake pads. That's part of the reason why discs have become popular for endurance and adventure bikes. With a rim brake, the tyre has to pass through the brake calliper, but that's not the case with discs, so they free up space for wider tyres. The result is that disc brakes are far less likely than rim brakes to be affected by water or gunk thrown up from the road. There are holes in a rotor that allow water to get out from underneath the brake pads too. Plus, with a disc system the braking surface, the rotor, is much further from the road than it is with a rim brake so it’s less likely to get wet from surface water. Anyone who has ever ridden carbon-fibre rim brake wheels knows that while they might be lightweight and fast, the braking performance isn’t brilliant, especially in wet conditions. With a rim brake system, you want the wheel rim to be as light as possible, you need it to be strong, and it also has to provide the braking surface. We’re really talking about decelerating substantially without locking up the wheel.”Ĭheck out what big bike industry names thought about the introduction of disc brakes on road bikes from a couple of years ago. That’s a term we don’t really care for, but it’s fine. Some people refer to that as ‘modulation’. You can take off more speed with greater control prior to locking up the wheel. “Everything we’ve focused on is prior to locking up the wheel. Locking up the wheel isn’t hard but if that were our goal we’d just sell you a stick that you could ram in there and you’d be done! SRAM’s Product Manager Paul Kantor told us, “I can certainly lock up my wheel with a carbon rim and a mechanical rim brake, but if I do that I’m still just sliding down the road and that sucks. SRAM Rival 22 shifters/hydraulic disc brakes - £235.99/brake.Shimano BR-R785 Di2 road hydraulic discs - £296.64/pair.Shimano RS-505 hydraulic discs - £249.00/pair.TRP Hy/Rd mechanical interface hydraulic disc brakes - £75.00/brake.TRP Spyre Mechanical Disc Brakes - £43.00-£55.00.Semi-hydraulic calipers like TRP's Hy/Rds are a sensible compromise upgrade They're more expensive, but disc brakes with hydraulic hoses to get braking force from lever to pad work better than cable-actuated systems With the UCI now allowing them in the professional peloton, discs are an ever more familiar part of the road riding landscape.ĭisc brakes provide better stopping power than rim brakes, especially in wet or cruddy conditionsĪ bike with disc brakes will still be rideable with a broken spoke or damaged rim, problems that can stop a rim-braked bike dead in its tracks Disc brakes have been used on the road for years but in the last couple of seasons they've become mainstream as major bike makers have offered disc-equipped bikes covering all sectors of the market from gravel bikes to endurance bikes to full-on road race rigs.
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