Crank arm keeps coming loose
10-04-05, 10:07 AM
#1
.
Thread Starter
Join Date: Sep 2004
Location: Chicago
Posts: 759
Bikes: Gios track,Miyata roadie, GT mtb
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Crank arm keeps coming loose
The non-drive side crank arm on my roadie keeps coming loose. The threads on the bottom bracket are fine, the crank arm looks okay. I put a new bolt on it and I have the same problem. Any ideas?
10-04-05, 10:17 AM
#2
put our Heads Together
Join Date: Jun 2003
Location: southeast pennsylvania
Posts: 3,155
Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Here's the way I was taught to install square-taper crankarms:
-put it on and tighten the bolt as much as you can. (don't use any kind of wrench extender though.)
-go ride for a minute; try standing on the pedals with the right pedal forward and then with the left pedal forward.
-tighten the bolt like in step 1.
after that, it should stay put.
-put it on and tighten the bolt as much as you can. (don't use any kind of wrench extender though.)
-go ride for a minute; try standing on the pedals with the right pedal forward and then with the left pedal forward.
-tighten the bolt like in step 1.
after that, it should stay put.
10-04-05, 10:27 AM
#3
.
Thread Starter
Join Date: Sep 2004
Location: Chicago
Posts: 759
Bikes: Gios track,Miyata roadie, GT mtb
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I cranked it on as tight as I could, rode for a while, then tightened again. Still coming loose.
10-04-05, 10:32 AM
#4
Senior Member
Join Date: Sep 2001
Location: Montreal
Posts: 6,521
Bikes: Peugeot Hybrid, Minelli Hybrid
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
After you tighten the crank take the bolt out and see if the end of the spindle is level with the suface of the crank that the bolt pushes on. The bolt may just be tightening onto the end of the spindle and not on the crank. If that is the case you either need a new crank or you must grind a couple of mm off the end of the spindle so the crank can be forced onto the taper.
10-04-05, 11:11 AM
#6
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by cerewa
Here's the way I was taught to install square-taper crankarms:
-put it on and tighten the bolt as much as you can. (don't use any kind of wrench extender though.)
-go ride for a minute; try standing on the pedals with the right pedal forward and then with the left pedal forward.
-tighten the bolt like in step 1.
after that, it should stay put.
-put it on and tighten the bolt as much as you can. (don't use any kind of wrench extender though.)
-go ride for a minute; try standing on the pedals with the right pedal forward and then with the left pedal forward.
-tighten the bolt like in step 1.
after that, it should stay put.
10-04-05, 11:52 AM
#7
Senior Member
Join Date: Aug 2003
Location: Las Cruces, NM
Posts: 102
Bikes: The only one I'll ever need...
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
agree with sydney...
since it keeps coming loose and you keep retightening it and it still comes loose, your best bet is to replace the crank arm. You may have warped the crank arm...
since it keeps coming loose and you keep retightening it and it still comes loose, your best bet is to replace the crank arm. You may have warped the crank arm...
