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  1. #1
    mtbr member
    Join Date
    Jul 2013

    Distance issue with TRP CX8.4 brakes on Tricross

    I'm upgrading my Tricross with a set of TRP CX8.4's. It previously had Avid Shorty 6 on it.

    I'm having trouble getting the distance between the top of the brake arms to match what the instructions says. It calls for no more than 45 mm, but I'm getting around 60 mm. I already have the narrow spacers on the pad side.

    TRP brake shoe | Flickr - Photo Sharing!

    TRP brake shoe distance | Flickr - Photo Sharing!

    Do all CX bikes have the same spacing between the brake bosses?

    Just to experiment a bit I tried to use the brake shoes from the Avids, and then the spacing looks much better:

    Canti brake shoe | Flickr - Photo Sharing!

    Canti brake shoe distance | Flickr - Photo Sharing!

    Am I doing something wrong?

  2. #2
    mtbr member
    Join Date
    Jul 2013

    Distance issue with TRP CX8.4 brakes on Tricross

    I measured the distance between my brake bosses, it's approx 75 mm.

    Sent from my iPad using Tapatalk

  3. #3
    mtbr member
    Join Date
    Oct 2007
    Try using the washers from the canti shoes on the TRP shoes.
    2015 Niner Jet 9 Carbon
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    1987 Haro RS1

  4. #4
    mtbr member
    Join Date
    May 2011
    Variables at play are the distance between the frame bosses, width of the rim, thickness of pads and spacers. There definitely are differences between the boss width on different frames. 80mm boss width is probably most typical these days but there are plenty of frames out there with boss width a low as 65mm. I don't think that the wider arm spacing you are getting is really a problem for function of the brakes other than effecting the clearance for the arms out past the frame for hitting your legs & body, still certainly less protrusion than most cantilever arms.

  5. #5
    mtbr member
    Join Date
    Jul 2008
    Simialr issues when I Installed mine overe a year ago, I just screw it got it close as I could and it has never been an issue.

    Edit this was not on a tricross, on a Rocky Mtn CXR, and they are great brakes worlds of differnece over the cheap cantis that were on that bike.
    XC, Road, XXC, Endurance, Mtn, All-Mtn, Cross, Gravel, just go have fun on 2 wheels!

  6. #6
    powered by peanut butter.
    Reputation: heartland's Avatar
    Join Date
    Sep 2009
    Just to add to the data set--my 8.4s measure ~40mm on a Surly Cross Check. I didn't measure them at all when I set them up, though. That's just where they ended up after lots of tinkering to get the lever feel that I wanted. I don't imagine the cable distance measurement matters too much. I'd just focus on getting them to perform how you want. They're GREAT brakes imho. I think you'll like 'em.
    "Never trust a man in a blue trench coat. Never drive a car when you're dead." -- Tom Waits

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