Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Coyote!
    Guest

    Groove in Rim: Another What's-It Inquiry

    On my Mavic rims, there's a groove about 6mm from the circumference, maybe 1mm deep. Itís on both sides of the rim. The groove bisects the plane that the brake pad contacts the rim when brakes are engaged.

    All I can make of this is that itís a rim wear gauge. If so, it just seems that thereís a whole lot of potential brake friction acreage taken up with ďmereĒ measurement.

    So. . .what IS this thing?

    Anyway, Iíll bet someone out there in BF Land knows thí answer. . .as usual Mercy Buckets [as my ancestor Clovis said when the Bloody Revolutionaries spared him from the Gilly-Tene].

  2. #2
    = cyclist's tan rat_factory's Avatar
    Join Date
    Jun 2005
    Location
    the big D in the big T
    My Bikes
    '82 Miyata 310, '87 Scott Boulder, '87 Schwinn Le Tour, '91 Cannondale SM500, '96 Schwinn Clear Creek, '99 Schwinn MesaGS, '05 Rockhopper
    Posts
    297
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    this is a channel for water to escape when braking in wet conditions. it works pretty well and it maybe even reduces 3 grams of the wheel weight.
    '82 Miyata 310, '87 Scott Boulder, '87 Schwinn Le Tour, '91 Cannondale SM500, '96 Schwinn Clear Creek, '99 Schwinn MesaGS, '05 Rockhopper

    ich bin

  3. #3
    THIS SPACE FOR RENT
    Join Date
    Jan 2006
    Posts
    2,849
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's a wear indicator. When that sucker bottoms out, it's time for new rims. Some other manufacturers just use a little dot.

  4. #4
    Klaatu barada nikto cascade168's Avatar
    Join Date
    Sep 2004
    Location
    Southern NH
    Posts
    1,453
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Landgolier
    It's a wear indicator. When that sucker bottoms out, it's time for new rims. Some other manufacturers just use a little dot.

    yup, Langolier is correct.
    "Work is the curse of the drinking class."
    - Oscar Wilde

  5. #5
    You Know!? For Kids! jsharr's Avatar
    Join Date
    Apr 2005
    Location
    Just NW of Richardson Bike Mart
    My Bikes
    '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
    Posts
    6,083
    Mentioned
    12 Post(s)
    Tagged
    3 Thread(s)
    mavic says it is a wear indicator

    http://www.mavic.com/ewb_pages/p/pis...hp?gamme=route
    Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
    Quote Originally Posted by colorider View Post
    Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

  6. #6
    = cyclist's tan rat_factory's Avatar
    Join Date
    Jun 2005
    Location
    the big D in the big T
    My Bikes
    '82 Miyata 310, '87 Scott Boulder, '87 Schwinn Le Tour, '91 Cannondale SM500, '96 Schwinn Clear Creek, '99 Schwinn MesaGS, '05 Rockhopper
    Posts
    297
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    wow my lbs has given me a lot of bad info. i was used to flat rims and when i bought my 05 Rockhopper they said the groove was for better braking when wet. i dont know what to think about that lbs.
    '82 Miyata 310, '87 Scott Boulder, '87 Schwinn Le Tour, '91 Cannondale SM500, '96 Schwinn Clear Creek, '99 Schwinn MesaGS, '05 Rockhopper

    ich bin

  7. #7
    THIS SPACE FOR RENT
    Join Date
    Jan 2006
    Posts
    2,849
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    People think that because that's how car tires work. It almost makes sense, but with no radial channels how is the water suposed to move into the grove other than by the radial channels on the brake pad, and why would you want it there anyway when centrifugal force is just going to spin it back out onto the outer half of the rim?

    No offense to the good bike salemen out there (I know a few), but often in a shop those who do not know enough to fix bikes are the ones selling bikes.

Posting Permissions

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