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Main
Date: 24 May 2007 09:25:27
From: Dieter Britz
Subject: Soft cranks?
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I put new cranks on a bike I was putting together. I am used to
tightening the bolts that press the cranks on the axle pretty tight, and
then they stay tight. But not these; they keep working themselves loose,
and I have to retighten them about once a day. I thought at first that
I had the washers the wrong way around, with the convex side out (I am
not even sure there is a concave, and a convex, side, but maybe there is)
but turning them around doesn't help either. What can be doing this?
--
Dieter Britz, http:<slashslash >w^3.chem.au.dk/~db
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Date: 24 May 2007 15:40:18
From: Bill
Subject: Re: Soft cranks?
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Dieter Britz wrote:
> I put new cranks on a bike I was putting together. I am used to
> tightening the bolts that press the cranks on the axle pretty tight, and
> then they stay tight. But not these; they keep working themselves loose,
> and I have to retighten them about once a day. I thought at first that
> I had the washers the wrong way around, with the convex side out (I am
> not even sure there is a concave, and a convex, side, but maybe there is)
> but turning them around doesn't help either. What can be doing this?
I had a bad right crank that did this to me. It turns out that putting
on a new crank fixed it for me. I couldn't see the difference, but the
BB sure could.
Bill Baka
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Date: 24 May 2007 17:09:20
From:
Subject: Re: Soft cranks?
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Dieter Britz writes:
> I put new cranks on a bike I was putting together. I am used to
> tightening the bolts that press the cranks on the axle pretty tight,
> and then they stay tight. But not these; they keep working
> themselves loose, and I have to retighten them about once a day. I
> thought at first that I had the washers the wrong way around, with
> the convex side out (I am not even sure there is a concave, and a
> convex, side, but maybe there is) but turning them around doesn't
> help either. What can be doing this?
http://www.sheldonbrown.com/brandt/installing-cranks.html
Jobst Brandt
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Date: 24 May 2007 05:39:06
From: Qui si parla Campagnolo
Subject: Re: Soft cranks?
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On May 24, 1:25 am, Dieter Britz <b...@chem.au.dk > wrote:
> I put new cranks on a bike I was putting together. I am used to
> tightening the bolts that press the cranks on the axle pretty tight, and
> then they stay tight. But not these; they keep working themselves loose,
> and I have to retighten them about once a day. I thought at first that
> I had the washers the wrong way around, with the convex side out (I am
> not even sure there is a concave, and a convex, side, but maybe there is)
> but turning them around doesn't help either. What can be doing this?
Not tight enough to staert with and after the first time they were
ridden lose, you trashed the inside flats..crank arm is dead.. 'May'
want to try a dry spindle and torque wrench...'may'
but maybe not...
> --
> Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db
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Date: 24 May 2007 11:29:18
From: Joel Mayes
Subject: Re: Soft cranks?
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On 2007-05-24, Dieter Britz <britz@chem.au.dk > wrote:
> I put new cranks on a bike I was putting together. I am used to
> tightening the bolts that press the cranks on the axle pretty tight, and
> then they stay tight. But not these; they keep working themselves loose,
> and I have to retighten them about once a day. I thought at first that
> I had the washers the wrong way around, with the convex side out (I am
> not even sure there is a concave, and a convex, side, but maybe there is)
> but turning them around doesn't help either. What can be doing this?
Square taper BB? If so you might be running into the JIS square
taper spindle + ISO square taper crank problem (they have the same taper
but start it at a different width).
Cheers
joel
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Human Powered Cycles
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