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Old 07-27-15, 03:07 PM
  #18  
mtseymour
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Join Date: Nov 2010
Location: Vancouver, BC
Posts: 415

Bikes: 2014 Calfee Tetra, 2014 Norco Carbon Sight, 2016 Giant TCR

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Originally Posted by twocicle View Post
Although the product description indicates rotor sizes of 140 and 160mm, like most disc calipers the Shimano R785 will work with much larger rotors such as a typical 203mm for the rear. Caveat with this caliper is that they are very strong brakes and so 203mm may develop too much force for a frame to handle. The downside of going with a smaller rotor is reduced heat capacity (larger rotors handle heat dissipation better). You will need to decide which size will work for your setup and usage.

The appropriate adapter size required is not unique to this caliper, it just depends on the frame or fork mount provided. For example, the Whisky No.9 disc fork post mounts need a 203mm Post/Post adapter to work with a 180mm rotor, but the rear ISO mount on our Calfee uses a typical 203mm ISO/Post adapter for a 203mm rotor.
Good to know. Although we're very happy with the Dura Ace 9000 front caliper, we may go with dual disk brakes (probably full-hydraulic with 180mm rotors) at some point. This will provide more consistent brake modulation, and allow us to use a front carbon wheel (our rear carbon disk wheel has worked fine so far).
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