This article originally appeared on BikeRadar
Cervélo has finally joined the ranks of road disc bike brands with a modified version of the R3, which will see service in this year's UCI-approved test events under pro team MTN-Qhubeka.
To accommodate disc brakes, Cervélo redesigned the rear end of the R3. The slender seatstays now flow all the way into the seat tube, giving a wider and stiffer platform than the existing R3's monostay design.
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Both the seat- and chainstays are asymmetric, with the disc side's seatstay connected at the back of the dropout, whereas on the derailleur side it meets on the top of the forward face.
To keep the R3's racy handling, Cérvelo's engineers managed to maintain the same short chainstay length of 405mm, rather than having to shift to the longer 415mm recommended by disc brake manufacturers. Cervélo achieved this by using a custom FSA SL-K crank with a 5mm offset to ensure the correct chainline.
A custom-offset crank keeps the chainline right with 405mm chainstays and the 135mm rear hub
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