Wobbly Bits.

Hello People,

I’ve got a very simple problem with my uni (or so I thought).

The left hand crank constantly gets loose. I’ve tried the old tricks of beating
it on with a wooden mallet and then tightening it. I’ve tried tightening it with
a very large torque wrench to a stage that I’m worried I’ll start stripping the
threads. This only lasts about 10 minutes though.

Does anyone have any ideas??

I don’t know what sort of cranks they are but they are secured by a single bolt
(does that mean they are cotterless?). The uni itself is a cheap taiwanese thing
(I think) that I bought second hand.

Cheers,

Martin.

P.S. Congrats John Foss re the thieving scumbags. Justice has prevailed.

Sent via Deja.com http://www.deja.com/ Before you buy.

RE: Wobbly Bits.

Martin,

> beating it on with a wooden mallet and then tightening it. I’ve tried
> tightening it with a very large torque wrench to a stage that I’m worried I’ll
> start stripping the threads. This only lasts about 10 minutes though.

Sounds like either your crank or axle are toast, unfortunately. If lucky, it’s
the crank arm and you can just get a new one. I don’t know if there’s an easier
way to tell than by putting a new one on and seeing if it comes loose?

> P.S. Congrats John Foss re the thieving scumbags. Justice has prevailed.

Thank you. Justice will truly prevail if the guy gets a conviction. About this I
don’t really care. What I really do care about is that he stay out of my
neighborhood…

John Foss, the Uni-Cyclone (reply to jfoss@unicycling.com)
http://www.unicycling.com

Not only found the MUnis, found the possible thief!

RE: Wobbly Bits.

Martin, Sounds like you have cottered cranks, but just in case you have
cotterless cranks:

A few things you can try first (for cotterless cranks).

  1. replace the nut. I have found that the “grippy” inside of the nut (the
    surface that mates with the crank) wears away after tightening many times.
    Get a new one (or several) and it may stay tight.

  2. Use loc-tight or super-glue on the threads.

  3. tighten and re-tighten - ride it around a bit (bounce or hop) and re-tighten.

If the crank is loose after all the tightening then it’s time for a new crank
arm - or maybe (hope not) a new axle.

Dirk

-----Original Message----- From: Martin [mailto:mbridle@my-deja.com] Sent:
Friday, February 18, 2000 10:57 AM To: unicycling@winternet.com Subject:
Wobbly Bits.

Hello People,

I’ve got a very simple problem with my uni (or so I thought).

The left hand crank constantly gets loose. I’ve tried the old tricks of beating
it on with a wooden mallet and then tightening it. I’ve tried tightening it with
a very large torque wrench to a stage that I’m worried I’ll start stripping the
threads. This only lasts about 10 minutes though.

Does anyone have any ideas??

I don’t know what sort of cranks they are but they are secured by a single bolt
(does that mean they are cotterless?). The uni itself is a cheap taiwanese thing
(I think) that I bought second hand.

Cheers,

Martin.

P.S. Congrats John Foss re the thieving scumbags. Justice has prevailed.

Sent via Deja.com http://www.deja.com/ Before you buy.

Re: Wobbly Bits.

My friend ran into the same problem. We took the crank apart and found that the
bolt had loosened up a bit and the aluminium crank on the steel axle had
deformed the crank, se we couldn’t tighten it down. We put a couple small pieces
of pop cans in there to shim it up a bit, and then gave it a good whack with a
wooden hammer. When we tightened the bolt it would still loosen up but on after
a couple weeks of heavy riding (as opposed to 10 minutes).

Ben

     ___o _ \<,_ ______(_)/ (_)_____ Ben Kennedy

On Fri, 18 Feb 2000, Martin wrote:

> Hello People,
>
> I’ve got a very simple problem with my uni (or so I thought).
>
> The left hand crank constantly gets loose. I’ve tried the old tricks of
> beating it on with a wooden mallet and then tightening it. I’ve tried
> tightening it with a very large torque wrench to a stage that I’m worried I’ll
> start stripping the threads. This only lasts about 10 minutes though.
>
> Does anyone have any ideas??
>
> I don’t know what sort of cranks they are but they are secured by a single
> bolt (does that mean they are cotterless?). The uni itself is a cheap
> taiwanese thing (I think) that I bought second hand.
>
> Cheers,
>
> Martin.
>
>
> P.S. Congrats John Foss re the thieving scumbags. Justice has prevailed.
>
>
> Sent via Deja.com http://www.deja.com/ Before you buy.

Re: Wobbly Bits.

Martin wrote:
>The left hand crank constantly gets loose.

Presumably you ride left footed? In which case, the left hand end of the axle
gets a lot more wear than the right, if only from taking all your weight when
you mount.

I had this problem for several years. The eventual solution was to replace
both the axle (which involved replacing the hub and rebuilding the wheel) and
the crank.

Don’t just replace one or the other - both will be worn. A worn crank won’t fit
as well as a new crank on a new axle, and will start to wear the new axle. And
vice versa.


Danny Colyer (danny@speedy5.freeserve.co.uk) http://www.speedy5.freeserve.co.uk/
Getting out of bed is a terrible way to have to start the day.

Re: Wobbly Bits.

The uni only cost me £40. Perhaps I ought to just buy a new 26" muni instead.

Sounds like a good excuse…err…reason to me.

And yes I do ride left-footed.

I have just tried a bit of trail riding for the first time and despite a
fall which mearly damaged my dignity and my laundry bill I think I may well
be addicted.

Martin.

In article <88uqi2$q7f$2@newsg3.svr.pol.co.uk>, “Danny Colyer”
<danny@speedy5.freeyour.headserve.co.uk> wrote:
> Martin wrote:
> >The left hand crank constantly gets loose.
>
> Presumably you ride left footed? In which case, the left hand end of
the
> axle gets a lot more wear than the right, if only from taking all your weight
> when you mount.
>
> I had this problem for several years. The eventual solution was to
replace
> both the axle (which involved replacing the hub and rebuilding the
wheel)
> and the crank.
>
> Don’t just replace one or the other - both will be worn. A worn
crank won’t
> fit as well as a new crank on a new axle, and will start to wear the
new
> axle. And vice versa.
>
> –
> Danny Colyer (danny@speedy5.freeserve.co.uk)
> http://www.speedy5.freeserve.co.uk/ Getting out of bed is a terrible way to
> have to start the day.
>
>

Sent via Deja.com http://www.deja.com/ Before you buy.