Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-20-06, 09:19 AM   #1
Coyote!
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
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].
  Reply With Quote
Old 04-20-06, 09:36 AM   #2
rat_factory
= cyclist's tan
 
rat_factory's Avatar
 
Join Date: Jun 2005
Location: the big D in the big T
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)
Quoted: 0 Post(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.
rat_factory is offline   Reply With Quote
Old 04-20-06, 09:45 AM   #3
Landgolier
THIS SPACE FOR RENT
 
Join Date: Jan 2006
Bikes:
Posts: 2,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Landgolier is offline   Reply With Quote
Old 04-20-06, 09:58 AM   #4
cascade168
Klaatu barada nikto
 
cascade168's Avatar
 
Join Date: Sep 2004
Location: Southern NH
Bikes:
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
cascade168 is offline   Reply With Quote
Old 04-20-06, 10:15 AM   #5
jsharr
You Know!? For Kids!
 
jsharr's Avatar
 
Join Date: Apr 2005
Location: Just NW of Richardson Bike Mart
Bikes: '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
Posts: 6,157
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(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.
jsharr is offline   Reply With Quote
Old 04-20-06, 02:49 PM   #6
rat_factory
= cyclist's tan
 
rat_factory's Avatar
 
Join Date: Jun 2005
Location: the big D in the big T
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)
Quoted: 0 Post(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.
rat_factory is offline   Reply With Quote
Old 04-20-06, 03:07 PM   #7
Landgolier
THIS SPACE FOR RENT
 
Join Date: Jan 2006
Bikes:
Posts: 2,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Landgolier is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:46 AM.