Groupset manufacturer SRAM has today announced a new range of hydraulic disc brake calipers that use the Flat Mount open standard introduced by Shimano last year. With brakes to match all three of the company’s hydraulic road groupsets (Red 22, Force 22 and Rival 22, including their 1x variants), we’re taking this as a wholehearted endorsement of the standard.
Flat Mount allows for neater, more space efficient calipers, reducing the brakes’ footprint on the frame and making life easier both for bike designers and riders who work on their own bikes. The caliper mounting bolts thread into the calipers themselves rather than the frame as on a post-mount setup. At the rear, the bolts actually pass through the chainstay, while front brakes are bolted to a thin mounting plate, which itself is bolted to the fork. While Flat Mount frames can mount standard brakes with adapters, Flat Mount calipers are not backwards compatible with existing IS and post-mount frames. On native Flat Mount frames the brakes make for a clean, uncluttered look as demonstrated on the new Izalco Max Disc from Focus.
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The rear brakes use 140mm discs by default, or 160mm with an adaptor, while the fronts can be switched between the two sizes by flipping their mounting plate 180 degrees. SRAM recommends that all but the lightest riders run 160mm rotors front and rear, and given the minimal weight penalty there’s little reason not to. On the subject of weight, SRAM hasn't made any great claims about the new brakes and the claimed figures look quite similar to the standard models, at 459g, 489g and 496g for Red, Force and Rival respectively. (Front brake, 160mm rotor, 800mm hose, full mounting hardware.)
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