C
Carl Fogel
Guest
Tim McNamara <[email protected]> wrote in message news:<[email protected]>...
> Werehatrack <[email protected]> writes:
>
> > On Sat, 28 Feb 2004 00:01:28 +0100, "SMMB" <[email protected]> may have said:
> >
> >>Now that's the right failure mode ? Everything fails, somehow, sometime.
> >
> > Aluminum rims appear not to have a "right" failure mode
>
> The "right" failure mode is one that is predictable and non-catastrophic. Non-anodized and
> socketed aluminum rims have the right failure mode in that failure is predictable from braking
> area wear. Anodized rims, introducing new catastrophic failure modes, do not have the "right"
> failure mode.
Dear Tim,
Do you have any pictures of brake-wear failure, catastrophic or otherwise? The post below, for
example, has pictures may be brake-wear failure. (Confusingly, it's from another of the legion of
Daves on rec.bicycles.tech).
[begin post with rim failure picture links]
From: un smowler <[email protected]> To: [email protected] Subject: Worn Out Rims Date: Tue,
11 Nov 2003 18:53:25 -0800 (PST)
Carl: I've been reading some of the RBT threads for lunchtime diversion recently. I was surprised
that folks with much more cycling experience than mine had never seen worn out rims before. Attached
are photos of a completely depreciated Mavic 221 rim. Its life was just over 2 seasons of mountain
biking in southern Maine. For me a season is 6-7 months, 2 to 3 rides/week, 2-3 hours/ride. It's
about typical rim life for me, only the failure mode is unusual. Usually I replace rims when they've
gotten a major ding, which becomes easier and easier to do as the rim wears. This one somehow never
got that abuse. It failed while I was trying to seat a studded tire, at about 60 psi. As an outcome,
I have gotten a bit quicker to replace rims when they start to flare out, and keep ear protectors
handy by the floor pump!
Feel free to quote me when you post the pics. Dave D
Dear Dave,
Here are your pictures of the failed rim:
http://home.comcast.net/~carlfogel/download/rim.jpg
http://home.comcast.net/~carlfogel/download/rimdetail.jpg
Thanks!
Carl Fogel
[end post]
Whatever happened to this rim, it looks catastrophic. It would be nice if someone had close-up
pictures of a non-anodized rim failing from brake-wear.
Carl Fogel
> Werehatrack <[email protected]> writes:
>
> > On Sat, 28 Feb 2004 00:01:28 +0100, "SMMB" <[email protected]> may have said:
> >
> >>Now that's the right failure mode ? Everything fails, somehow, sometime.
> >
> > Aluminum rims appear not to have a "right" failure mode
>
> The "right" failure mode is one that is predictable and non-catastrophic. Non-anodized and
> socketed aluminum rims have the right failure mode in that failure is predictable from braking
> area wear. Anodized rims, introducing new catastrophic failure modes, do not have the "right"
> failure mode.
Dear Tim,
Do you have any pictures of brake-wear failure, catastrophic or otherwise? The post below, for
example, has pictures may be brake-wear failure. (Confusingly, it's from another of the legion of
Daves on rec.bicycles.tech).
[begin post with rim failure picture links]
From: un smowler <[email protected]> To: [email protected] Subject: Worn Out Rims Date: Tue,
11 Nov 2003 18:53:25 -0800 (PST)
Carl: I've been reading some of the RBT threads for lunchtime diversion recently. I was surprised
that folks with much more cycling experience than mine had never seen worn out rims before. Attached
are photos of a completely depreciated Mavic 221 rim. Its life was just over 2 seasons of mountain
biking in southern Maine. For me a season is 6-7 months, 2 to 3 rides/week, 2-3 hours/ride. It's
about typical rim life for me, only the failure mode is unusual. Usually I replace rims when they've
gotten a major ding, which becomes easier and easier to do as the rim wears. This one somehow never
got that abuse. It failed while I was trying to seat a studded tire, at about 60 psi. As an outcome,
I have gotten a bit quicker to replace rims when they start to flare out, and keep ear protectors
handy by the floor pump!
Feel free to quote me when you post the pics. Dave D
Dear Dave,
Here are your pictures of the failed rim:
http://home.comcast.net/~carlfogel/download/rim.jpg
http://home.comcast.net/~carlfogel/download/rimdetail.jpg
Thanks!
Carl Fogel
[end post]
Whatever happened to this rim, it looks catastrophic. It would be nice if someone had close-up
pictures of a non-anodized rim failing from brake-wear.
Carl Fogel