Clunk



B

bill

Guest
I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
I get a clunk when my left pushes down. Any ideas? Thanks
 
D

David L. Johnson

Guest
On Mon, 12 Dec 2005 13:00:52 -0800, bill wrote:

> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
> I get a clunk when my left pushes down. Any ideas? Thanks


If the cranks are cottered, it would seem to be a loose crank arm. If
they are square tapered and you feel something like this, the crank arm is
toast.

--

David L. Johnson

__o | Deserves death! I daresay he does. Many that live deserve
_`\(,_ | death. And some that die deserve life. Can you give it to
(_)/ (_) | them? Then do not be too eager to deal out death in judgement.
-- J. R. R. Tolkein
 
D

David L. Johnson

Guest
On Mon, 12 Dec 2005 13:00:52 -0800, bill wrote:

> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
> I get a clunk when my left pushes down. Any ideas? Thanks


If the cranks are cottered, it would seem to be a loose crank arm. If
they are square tapered and you feel something like this, the crank arm is
toast.

--

David L. Johnson

__o | Deserves death! I daresay he does. Many that live deserve
_`\(,_ | death. And some that die deserve life. Can you give it to
(_)/ (_) | them? Then do not be too eager to deal out death in judgement.
-- J. R. R. Tolkein
 
M

Mike Jacoubowsky

Guest
>> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
>> I get a clunk when my left pushes down. Any ideas? Thanks

>
> If the cranks are cottered, it would seem to be a loose crank arm. If
> they are square tapered and you feel something like this, the crank arm is
> toast.


Or, it could be where the brake arm is attached to the frame. If that's
loose, each sequence of braking/accelerating will result in a "clunk" as the
brake arm moves up & down.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com


"David L. Johnson" <[email protected]> wrote in message
news:p[email protected]
> On Mon, 12 Dec 2005 13:00:52 -0800, bill wrote:
>
>> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
>> I get a clunk when my left pushes down. Any ideas? Thanks

>
> If the cranks are cottered, it would seem to be a loose crank arm. If
> they are square tapered and you feel something like this, the crank arm is
> toast.
>
> --
>
> David L. Johnson
>
> __o | Deserves death! I daresay he does. Many that live deserve
> _`\(,_ | death. And some that die deserve life. Can you give it to
> (_)/ (_) | them? Then do not be too eager to deal out death in judgement.
> -- J. R. R. Tolkein
>
 
M

Mark Janeba

Guest
bill wrote:
> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
> I get a clunk when my left pushes down. Any ideas? Thanks


You seem to say that the clunk is heard in synch with the crank, and
only as one side is pushed. If the crank is cottered, I'd suspect a
mangled cotter pin. See http://sheldonbrown.com/cotters.html

Mark
 
M

Mark Janeba

Guest
bill wrote:
> I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
> I get a clunk when my left pushes down. Any ideas? Thanks


You seem to say that the clunk is heard in synch with the crank, and
only as one side is pushed. If the crank is cottered, I'd suspect a
mangled cotter pin. See http://sheldonbrown.com/cotters.html

Mark
 
A

A Muzi

Guest
bill wrote:
I have a cheap 3 speed coaster brake comfort cruiser.
When accelerating
> I get a clunk when my left pushes down. Any ideas? Thanks


loose pedal
problem with pedal bearing
loose crank arm on spindle
crank bearing assembly loose in the frame
or maybe not properly lubed/adjusted

Any experienced mechanic can tell you in a couple of minutes.



--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
 
W

Werehatrack

Guest
On 12 Dec 2005 13:00:52 -0800, "bill" <[email protected]>
wrote:

>I have a cheap 3 speed coaster brake comfort cruiser. When accelerating
>I get a clunk when my left pushes down. Any ideas? Thanks


Assuming that this has a one-piece crank, I'd start by greasing and
adjusting the BB. It's been my experience that this is a typical
place to find that noise in this type of unit. Also, from recent
experience, check to make sure that the kickstand clamp isn't so close
to the front sprocket that it makes contact when you exert pressure
with the left pedal.
--
Typoes are a feature, not a bug.
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