Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member Novakane's Avatar
    Join Date
    Aug 2006
    Location
    Canada's Capital
    My Bikes
    Sekine RM40 1980, Miyata 1000LT 1990, Raleigh Mixte Sprite 1980, Raleigh Grand Prix 1979
    Posts
    549
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Weinmann 610/750 Front/Back... Why Was This Done?

    Just an observation on most of the Weinmann brakes I've accumulated - it seems often that they had a 610 up front and a longer reach 750 in the back. On a 27" wheel on my bikes the 610 will have the pad at the max extension position, and the back will be about mid-

    So, this brings questions to mind:
    Why was this done if a 610 would have reached on both ends?
    Would the 750 be adequate to accommodate 700C rims?
    Is the any reason the rear 750 couldn't be used as a front brake?

  2. #2
    Senior Member
    Join Date
    Nov 2005
    My Bikes
    Cinelli, Paramount, Raleigh, Carlton, Zeus, Gemniani, Frejus, Legnano, Pinarello, Falcon
    Posts
    5,775
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Used to be kinda the standard. No real reason except when the rear one is too short. Really depends where they decided to braze the brake bridge.

    Yes, you can swith short and long to front or back to fit your needs by changing the center bolt. Front and rear are different lengths.

  3. #3
    Disraeli Gears Charles Wahl's Avatar
    Join Date
    Jul 2007
    Location
    NYC
    My Bikes
    Riding: 1960s Falcon commuter; Queued: 1977 Bob Jackson, 1983 Serotta Club Special, 1984 Motobécane Team Champion, 1983 Guerciotti SLX, 1974 Harding (like Holdsworth Pro), 1974 Peugeot PX10LE, 1970s Jeunet Franche-Comté, 1974 Raleigh International
    Posts
    3,009
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I think that there is a real reason, and it has to do with long chainstays on older bikes (which, apart from ride characteristics, helped allow getting the wheel in and out of a frame having both horizontal dropouts and fenders). Once the fender is set to have clearance in front of the wheel, it looks funny if the clearance at brake bridge is much closer, so additional clearance was provided there too. Result: you need a longer reach brake in the rear (how much? Oh, about 14 mm according to Weinmann). Without fenders, the "roughly equivalent clearance" problem isn't really a factor; so the brake bridge can be lowered, as it is on many bikes that followed the "please, no fenders, we're not British" fad.
    Last edited by Charles Wahl; 08-13-12 at 07:59 PM.

  4. #4
    Senior Member Novakane's Avatar
    Join Date
    Aug 2006
    Location
    Canada's Capital
    My Bikes
    Sekine RM40 1980, Miyata 1000LT 1990, Raleigh Mixte Sprite 1980, Raleigh Grand Prix 1979
    Posts
    549
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the replies. Has anyone tried using the 750's to mount a 700c into an originally 27" wheeled frame? Is the reach enough?

  5. #5
    Senior Member
    Join Date
    Jul 2006
    Location
    Ontario
    Posts
    281
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    From Charles answer: the 750 have an extra 14mm reach and that should be enough to reach to 700c wheels since these are just 4mm lower (622mm diameter rims vs. 630mm). Depends on how high the brake bridge is on the frame.

  6. #6
    Disraeli Gears Charles Wahl's Avatar
    Join Date
    Jul 2007
    Location
    NYC
    My Bikes
    Riding: 1960s Falcon commuter; Queued: 1977 Bob Jackson, 1983 Serotta Club Special, 1984 Motobécane Team Champion, 1983 Guerciotti SLX, 1974 Harding (like Holdsworth Pro), 1974 Peugeot PX10LE, 1970s Jeunet Franche-Comté, 1974 Raleigh International
    Posts
    3,009
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I have an old English frame that originally took a Weinmann 750 on the rear (with 27" rims, presumably) -- I converted it to 700C, and the 750 works for that too. Pads are near the bottom of the slots, though. As leecycle says, the difference is only 4 mm in reach.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •