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  1. #1
    Holy crip he's a crapple
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    Upgrading my old KHS, what brakes will work?

    Bike came with 27x1 1/4" rear wheel with dia-comp brake calipers.

    I have changed to a 700c wider touring style wheel with 700x35 (iirc) Michilin City commuter tires.

    My dia-comp brake calipers still work on this setup, but I've got a nicer set of gran-comp calipers w/quick releases that I really want to use, but they don't fit over my new rear setup and barely fit my front setup, which is still the original 27x1 1/8" with continental ultra sport tire? It seems these brakes don't have a long enough reach? They came off a ~79 centurion semi-pro with 27" wheels, so I'm very confused why they don't work at least up front. I could probably get enough throw out of the front one to work if I enlarged the adjusting slot to put the pads lower, right now it slightly rubs tire if I use it.


    Other things I've done to the bike are-
    changed suntour stem shifters for suntour bar-end shifters
    changed no-name crankset for Sugino Mighty 42/52
    changed (blew apart) cup/cone old bottom bracket for a shimano un54 sealed cartridge unit
    5spd suntour freewheel for a 7spd 11-28 shimano
    suntour honor derailleurs for suntour cyclone units (WOW do these work so much better!).
    turkey-lever dia-comp non-aero brake levers for a cheap ebay set of aero levers, which I don't like because the hoods are so narrow they cramp my large hands.


    I assume I'll need long reach? I plan to upgrade to integrated shifter/brake levers in the future when I come across a good deal, so if I have to buy some long reach calipers I would like them to work with what I have now in addition to some shimano 'brifters' in the future.

    I plan to change my front wheel/tire to a matching 700x35 city tire setup when what is on there now wears out, but I only put about 1000 miles a year commuting to work so the front will probably remain the same for a couple years.


    Here's a couple pics of how the bike has transformed just for fun







    2012 Trek Madone 5.2 64cm - 1984 68cm KHS 9spd/sti swapped to DA 7700
    2013 Trek Rumblefish Elite 23" - 2004 Santa Cruz Bullitt 21.5"

  2. #2
    Holy crip he's a crapple
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    these are the gran-comp calipers I have that don't fit over the back tire, and don't reach far enough on the front 27" setup, which seems to be the same size as the bike these calipers came off of?


    2012 Trek Madone 5.2 64cm - 1984 68cm KHS 9spd/sti swapped to DA 7700
    2013 Trek Rumblefish Elite 23" - 2004 Santa Cruz Bullitt 21.5"

  3. #3
    Senior Member Chris_in_Miami's Avatar
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    The Centurion was designed with less clearance between the tire and the fork crown & brake bridge, since it used lower-profile tires. The brake calipers are shorter reach, and wouldn't work on the KHS because it has room for bigger tires and requires more reach.

    You'll need nutted long-reach brakes to make the 700c wheels work, but it should be possible.

  4. #4
    Rolling along fas2c's Avatar
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    Tetkro makes some nice long reach calipers. Many have used them with 27" conversions with great sucess.

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