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Need some front brakes/wheel data

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    Need some front brakes/wheel data

    Hi all,
    This is my first post.
    I don't own a GS, but a 1969 Triumph Bonneville! Reason I'm here is I'm having a bike project which might include a GS spoked front wheel, but I need a bit more info to validate my choice before I start buying parts that won't fit (been there!).
    About the project: the bike will be a mix of Bonneville (rear sub frame, seat, petrol and oil tanks, headlamp, electronic replica Smiths gauges...) and Sportster (1200 engine, front frame loop, secondary transmission and rear brake).
    As for the front end, I'm after modern efficiency (by my outdated standards) still retaining a classic look. A 94 CBR60F2 fork seems to be a good bet regarding many parameters (fork length, damping caracteristics, braking performance, rotors diameter, availability, price).
    CBR rotors are 276mm in diameter and 5mm thick. Wheel spindle is 20mm, but the bearings are 47mm OD.
    If I'm not mistaken, those figures indicate spoked GS wheel and rotors might be a good choice to complement the front end, but I need a couple more measurements before I set my mind. I couldn't find these after hours of research, so I thank in advance everyone who will help:
    1- Distance between rotors external faces. Please indicate thickness of rotors as well.
    2- Distance between fork sliders taken at wheel axle position.
    Again, thanks for your help and sorry for this long first post!

    #2
    Most 4 pot callipers wont fit a spoke wheel due to the spokes being wider than a mag. Pretty sure thats correct, cant take measurements atm as wont be 7am for 11 more hrs so i can get into garage

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      #3
      Originally posted by sharpy View Post
      Most 4 pot callipers wont fit a spoke wheel due to the spokes being wider than a mag. Pretty sure thats correct, cant take measurements atm as wont be 7am for 11 more hrs so i can get into garage
      Hi Sharpy,
      Thanks for the heads up. One more thing to investigate with the CBR guys...

      Comment


        #4
        Originally posted by sharpy View Post
        Most 4 pot callipers wont fit a spoke wheel due to the spokes being wider than a mag. Pretty sure thats correct, cant take measurements atm as wont be 7am for 11 more hrs so i can get into garage
        I think the F2 calipers are the fake 4 pot single acting type, with 2 pistons on the outside and then the caliper body slides on pins. If this is correct they should have lots of room for spokes, if not then OP will have some clearance issues.


        Mark
        1982 GS1100E
        1998 ZX-6R
        2005 KTM 450EXC

        Comment


          #5
          Originally posted by mmattockx View Post
          I think the F2 calipers are the fake 4 pot single acting type, with 2 pistons on the outside and then the caliper body slides on pins. If this is correct they should have lots of room for spokes, if not then OP will have some clearance issues.


          Mark
          Correct. Looks like the F2 front brakes are 2 pistons floating type. I'll double check anyway. Thanks.

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