A
Andre Jute
Guest
On Feb 4, 7:08 pm, "Clive George" <[email protected]> wrote:
> "Andre Jute" <[email protected]> wrote in message
>
> news:e9dcfce3-f66b-4451-8db8-d4a87984883b@i12g2000prf.googlegroups.com...
>
> >> >But both my bikes, including the Gazelle which
> >> >has a stand of decent length, have fallen over onto the pedals and
> >> >required new cranks on the left side, the older Gazelle several times;
> >> >the Trek has also fallen over to the right.
>
> >> New cranks?!!
>
> >> Are they made of cheese or something?
>
> >Aluminium. A heavy enough bike has no trouble bending then so they
> >interfere with the frame. Even if that doesn't happen, they can fall
> >on the pedal hard enough to ruin the thread; I have one of those
> >downstairs, I think, if you would like a photograph. Surely you don't
> >still have steel cranks on your bike, Clive? Or are you so la di da
> >that you have titanium cranks?
>
> I've got perfectly normal square-taper ally cranks. And I've never bust or
> bent one, despite hitting pedals quite hard - on an MTB tandem, so not
> exactly lightweight once you've got the riders weight included. (the pedals
> on that bike bear the scars).
>
> I've not heard of massive numbers of cranks failing in that way from the MTB
> world, and I'd expect them to be giving the thing a harder time than just
> falling on it.
>
> So are your cranks just substandard? Would it be worth getting something of
> higher quality?
>
> clive
I just looked at the crank with the stripped thread. The brand or type
name is VisionM and it claims to have been cold forged in France; it
also seems on visual inspection to be of much more than adequate beam
strengh, being a V design in three dimensions. It's clear to me that
they cold forged the thing, then cut the thread and then didn't give
it any further treatment. I went to enormous trouble to get an exact
replacement which went the same way, then got something the kid on the
phone at a mailorder dealer recommended, which bent when the bike fell
over on it, another recommendation which (understandably) bent when
bike and I fell on it very hard indeed, and then I went to the generic
type my LBS keeps for a while, and took them off unscathed when I
simplified matters by standardizing on Shimano Nexus cranks and
chainwheels. The Shimano ones appear thin but I've had no trouble with
them whatsoever; they're also the best looking of the lost.
HTH.
Andre Jute
What? Me worry? -- Alfred E. Neumann
> "Andre Jute" <[email protected]> wrote in message
>
> news:e9dcfce3-f66b-4451-8db8-d4a87984883b@i12g2000prf.googlegroups.com...
>
> >> >But both my bikes, including the Gazelle which
> >> >has a stand of decent length, have fallen over onto the pedals and
> >> >required new cranks on the left side, the older Gazelle several times;
> >> >the Trek has also fallen over to the right.
>
> >> New cranks?!!
>
> >> Are they made of cheese or something?
>
> >Aluminium. A heavy enough bike has no trouble bending then so they
> >interfere with the frame. Even if that doesn't happen, they can fall
> >on the pedal hard enough to ruin the thread; I have one of those
> >downstairs, I think, if you would like a photograph. Surely you don't
> >still have steel cranks on your bike, Clive? Or are you so la di da
> >that you have titanium cranks?
>
> I've got perfectly normal square-taper ally cranks. And I've never bust or
> bent one, despite hitting pedals quite hard - on an MTB tandem, so not
> exactly lightweight once you've got the riders weight included. (the pedals
> on that bike bear the scars).
>
> I've not heard of massive numbers of cranks failing in that way from the MTB
> world, and I'd expect them to be giving the thing a harder time than just
> falling on it.
>
> So are your cranks just substandard? Would it be worth getting something of
> higher quality?
>
> clive
I just looked at the crank with the stripped thread. The brand or type
name is VisionM and it claims to have been cold forged in France; it
also seems on visual inspection to be of much more than adequate beam
strengh, being a V design in three dimensions. It's clear to me that
they cold forged the thing, then cut the thread and then didn't give
it any further treatment. I went to enormous trouble to get an exact
replacement which went the same way, then got something the kid on the
phone at a mailorder dealer recommended, which bent when the bike fell
over on it, another recommendation which (understandably) bent when
bike and I fell on it very hard indeed, and then I went to the generic
type my LBS keeps for a while, and took them off unscathed when I
simplified matters by standardizing on Shimano Nexus cranks and
chainwheels. The Shimano ones appear thin but I've had no trouble with
them whatsoever; they're also the best looking of the lost.
HTH.
Andre Jute
What? Me worry? -- Alfred E. Neumann