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 07-12-12, 11:29 AM   #1
Frankfast
Senior Member
Thread Starter
 
Frankfast's Avatar
 
Join Date: Sep 2011
Location: New York and San Juan
Bikes: Kestrel Talon SL, Surly Steamroller, Equipe SS/FG Beater
Posts: 480
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ticking in Rim

I went down a couple of weeks ago after hitting a pothole. Both the bike and I survived although I lost a little blood. The front rim picked up a ticking sound when turned slowly. I took the bike to the LBS who took the rim and tube, tire off and found all the spokes intact. The Mavic Equipe rim wasn't bent and was still true and he claimed something had broken inside the rim but wasn't serious and that riding with the rim would not present a problem. After I took the bike home I removed the tire, tube and strap to look for the problem but couldn't find anything. I spun the rim in my hand and there was no ticking sound but when I mounted the tire the ticking came back. I can't see the problem and can only hear it. It's very pronounced. Has anybody experienced this or would speculate about the problem?
Frankfast is offline   Reply With Quote
Old 07-12-12, 12:12 PM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,984
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 370 Post(s)
The biggest single cause of low speed rim ticking is small bits free to move around inside the rim. Often when rims are drilled, small chips fall into the rim. Makers shake them as best they can, and they fall out on their own if the rim has no eyelets. But if the maker doesn't get them all before installing the double eyelets, they're stuck there forever.

Some also don't shake out because they're still attached to the inside lip of the hole as large internal burrs. They'll stay in place for a while and eventually break off and cause rattles. The typical rattle caused by these only happens at low speeds, al they flop around like clothes in a front load washer. With higher speed, the wheel is in spin cycle and they're stuck in place on the outer wall.

Of course there might be something else going on, but if the wheel is aligned, and the braking in ever, indicating no variation in width, then just ride it and don't fret. If it really bothers you (it shouldn't) you can try to localize the area in the rim, and either see if you can work whatever it is down to the valve hole and out, or drill a small hole through the inner (sire) side of the rim, and inject a blob of grease or glue and try to trap it.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 07-12-12, 12:56 PM   #3
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta
Posts: 4,659
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 91 Post(s)
Another possibility is that the tire valve is knocking against the side of the hole in the rim.
dsbrantjr is offline   Reply With Quote
Old 07-12-12, 01:00 PM   #4
hueyhoolihan
Senior Member
 
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
Posts: 6,401
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
check spoke tension. you may have knocked the wheel/rim out of true or loosened one or two spokes when you hit the pothole.
hueyhoolihan is offline   Reply With Quote
Old 07-12-12, 02:19 PM   #5
Altbark
Senior Member
 
Join Date: Jan 2012
Location: Trenton On
Bikes: 2010 Cannondale T1, 1998 Specialized FSR
Posts: 245
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have the same problem with my Mavic A719's. Don't worry about it. Centrifigal force takes care of it once you start moving. Mavic uses some bit of metal to align the rim ends during construction and that little chunk of metal can sometimes come free. My front rim ticks when I walk the bike and the back one doesn't. Feel free to ride. Al
Altbark is offline   Reply With Quote
Old 07-12-12, 03:40 PM   #6
bradtx
Senior Member
 
Join Date: Jun 2010
Location: Pearland, Texas
Bikes: Cannondale, Trek, Raleigh, Santana
Posts: 6,698
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Frankfast, One of my CR18 rims had a piece of flashing come loose when they were new. The rattling was just too much to take and while it took more time than I wished, the little bit fell out. I also lucked out once removing a piece of welding rod from the RHS chainstay through the rear derailleur cable stop's screw hole. That happened on my first try and I was amazed as it usually takes longer to remove a pick from a flat top hollow body!

I didn't have to with the rim, but plan two was a shop vac.

Brad
bradtx is offline   Reply With Quote
Old 07-12-12, 10:58 PM   #7
Frankfast
Senior Member
Thread Starter
 
Frankfast's Avatar
 
Join Date: Sep 2011
Location: New York and San Juan
Bikes: Kestrel Talon SL, Surly Steamroller, Equipe SS/FG Beater
Posts: 480
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Altbark View Post
I have the same problem with my Mavic A719's. Don't worry about it. Centrifigal force takes care of it once you start moving. Mavic uses some bit of metal to align the rim ends during construction and that little chunk of metal can sometimes come free. My front rim ticks when I walk the bike and the back one doesn't. Feel free to ride. Al
That sounds exactly like the noise I'm experiencing. It's annoying but not enough to go out and purchase a new rim. Thanks everybody for the help.
Frankfast is offline   Reply With Quote
Old 07-12-12, 11:01 PM   #8
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Altbark View Post
I have the same problem with my Mavic A719's. Don't worry about it. Centrifigal force takes care of it once you start moving. Mavic uses some bit of metal to align the rim ends during construction and that little chunk of metal can sometimes come free. My front rim ticks when I walk the bike and the back one doesn't. Feel free to ride. Al
This is probably the culprit. It's easily fixed on a rim like the A719: go to the home-improvement store, buy a can of "expando-foam" canned insulation, and inject the rim at the joint. The foam will expand and immobilize the metal "slug" that was used to align the ends of the rim for welding. If the rim has no spoke holes in the bed, you can drill one just large enough to slip the can's injection straw through.

Another option is to support the rim on the edge of a 2 x 4, then peen the rim bed with a blunt nail. You'll probably see Mavic's own peening marks, in fact. It may take a pretty substantial divot to immobilize the slug this way; I'd rather use the expando-foam if it were me.
mechBgon 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 01:03 AM.