Cracks on rim

"Per Löwdin" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

Hi

My Mavic 517 rim has developed cracks. I would be utterly grateful for advice on how long I can
expect it to last. Will it blast on a long down hill? Or just anytime? Or last for years? Include
two shots of it w1.185.telia.comtillf1.jpgOpen ↗
w1.185.telia.comtillf2.JPGOpen ↗

Per user.tninet.seEnglish.htmlOpen ↗

I've never seen a catastrophic failure from this. The cracks are never uniform and usually they just
slowly detension the wheel as each spoke hole begins to fail. It's certainly finished and I'd say
replace as soon as you can afford it. You could probably ride it for a few weeks like it is now, but
you're tempting fate.

Cheers,

Scott..

Per Löwdin said:

My Mavic 517 rim has developed cracks. I would be utterly grateful for advice on how long I can
expect it to last.

How willing are you to find out the hard (landing) way?

Quoted message said:

Will it blast on a long down hill?

It could under the right circumstances.

Quoted message said:

Or just anytime?

It could eventually fatigue to the point of failure if you continue to ride on it.

Quoted message said:

Or last for years?

If you don't ride on that rim, it should last the rest of your lifetime. If you continue to ride on
it, it could shorten and end your lifetime. Easy $50/€50ish choice.

Quoted message said:

Include two shots of it w1.185.telia.comtillf1.jpgOpen ↗
w1.185.telia.comtillf2.JPGOpen ↗

I say replace as soon as you can. It's not worth finding out if it'll self-destruct on you at speed
or in traffic. A new rim is a lot less expensive than wrecking your bike, as well as a possible trip
to the hospital and/or a funeral.

Quoted message said:

I say replace as soon as you can.

It is not too easy, we are just about to go to the US, to ride, this wheel has a 32h rim, and I
would have to have it rebuilt with a new rim in just a couple of day, I might be able to do that.
And alternative would be to use another wheel, got a 28h bontrager wheel with a beautiful CK hub.
However, that rim i pretty worn too, though not cracked, and may have to be replaced. Are Bontrager
Race Lite MTB ceramic rims widely available and can I depend on finding a good wheel builder
somewhere in Colorado. Problem with that wheel is that is 28h which can be difficult to find.

Per

"Per Löwdin" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

It is not too easy, we are just about to go to the US, to ride, this wheel has a 32h rim, and I
would have to have it rebuilt with a new rim in just

a

Quoted message said:

couple of day, I might be able to do that. And alternative would be to use another wheel, got a
28h bontrager wheel with a beautiful CK hub. However, that rim i pretty worn too, though not
cracked, and may have to be

replaced.

Quoted message said:

Are Bontrager Race Lite MTB ceramic rims widely available and can I depend on finding a good
wheel builder somewhere in Colorado. Problem with that wheel is that is 28h which can be
difficult to find.

Per

If you're about to go on a cycle vacation to Colorado from another country I'd agree with cyclist101
and replace it immediately. If it's a 32h rim as you say, any shop worth it's salt would be able to
rebuild that for you in a few hours. Mavic 517's or equivalents are as common as dirt generally. I
would definitely do it now. Why burn your vacation time up by having to perform an emergency job in
a foreign country where you know nothing about the shops?? Waste it now at home and get it done. If
it were my shop and you explained about your vacation, I'd do your wheel immediately for you. Things
like that mean a lot to a customer. If it's impossible, take heart. Colorado has plenty of bike
shops, including Peter Chisholm's shop Vecchio's in Boulder, a frequent and knowledgeable
contributor here. I'm sure you can get the job done there in a day if he has MTB rims in stock.

Cheers,

Scott..

Quoted message said:

If it's a 32h rim as you say, any shop worth it's salt would be able to rebuild that for you in

a

Quoted message said:

few hours. Mavic 517's or equivalents are as common as dirt generally.

I prefer ceramic rims, last better, and they are not always readily available, but I believe it is
easier to find a 32h than a 28h.

Quoted message said:

I would definitely do it now. Why burn your vacation time up by having to perform an emergency job
in a foreign country where you know nothing about the shops??

True, I will either try to get it fixed in Stockholm before this week. Or take the other rear wheel,
though I am not too keen on travelling with a 28h rim that is pretty worn.

Chers

Per user.tninet.seMTB.htmlOpen ↗

Per Löwdin said:

Hi

My Mavic 517 rim has developed cracks. I would be utterly grateful for advice on how long I can
expect it to last.

It's done. Replace it now. OK, it might not suddenly collapse under you next week, but it will be
impossible to keep true. Replace it with a rim that does not have that anodizing coat on it, and it
will last longer.

--

David L. Johnson

__o | It is a scientifically proven fact that a mid life crisis can _`\(,_ | only be cured by
something racy and Italian. Bianchis and (_)/ (_) | Colnagos are a lot cheaper than Maserattis
and Ferraris. -- Glenn Davies

"Per Löwdin" <[email hidden]> wrote in message

Quoted message said:

My Mavic 517 rim has developed cracks. I would be utterly grateful for advice on how long I can
expect it to last. Will it blast on a long down hill? Or just anytime? Or last for years?

It may last months but will get less true until it's unrideable. I replaced a road rim with similar
probs last Sunday. It had been developing for many months and was getting unfashionably (but not yet
dangerously) untrue. It took me a few hours. If you can afford to go on an overseas riding holiday,
you must afford the new rim - NOW. Mark Lee

Quoted message said:

If you can afford to go on an overseas riding holiday, you must afford the new rim - NOW.

Of course, it more a matter of where to rebuild the wheel.

Per user.tninet.seMTB.htmlOpen ↗

perlowdin-<< My Mavic 517 rim has developed cracks. I would be utterly grateful for advice on how
long I can expect it to last. Will it blast on a long down hill? Or just anytime? Or last for years?

Quoted message said:

Quoted message said:

<BR><BR>

Not years, what is going to happen is it's going to go outta true at the cracks and no amount of
tensioning is goling to make it true again...time for a rebuild, maybe using Velocity rims.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Qui si parla Campagnolo said:

Not years, what is going to happen is it's going to go outta true at the

cracks

Quoted message said:

and no amount of tensioning is goling to make it true again...time for a rebuild, maybe using
Velocity rims.

Thanks Peter

I would like to change the rim. It may be OK for low speed technical singletrack in the Swedish
woods but I would feel distinctly uncomfortable doing those long fast ascents you got in Colorado,
as it will get extremely hot.

I like Mavic ceramic rims. This one has done some 12000 - 14000 km, in the Alps and in SE Asia,
mostly with heavy panniers. So I would like to replace it with a 517 or 618 or 521 ceramic. I will
try to fix it in Sweden before we leave but if I cannot I will mail you. Take it that it would not
be any problem to bike from Golding or Denver to Boulder with it.

Per

user.tninet.seMTB.htmlOpen ↗

Per Löwdin said:

I like Mavic ceramic rims. This one has done some 12000 - 14000 km, in the Alps and in SE Asia,
mostly with heavy panniers. So I would like to replace it with a 517 or 618 or 521 ceramic.

I guess you enjoy using rims that fail prematurely. 14000 km is an unacceptable life for a rim. I
have more than double that on my current rims, with no signs of cracking. What part of "ceramic rims
are junk" don't you understand?
--
terry morse Palo Alto, CA terrymorse.combikeOpen ↗

Does anyone have a manual for the Vetta HR 1000 they would be willing to copy or scan?

Brian Rosenthal

Quoted message said:

I guess you enjoy using rims that fail prematurely. 14000 km is an unacceptable life for a rim.

That really depends what it is exposed to. This rim has done a lot of Alpine singletrack
user.tninet.seSingleTrack2000.htmOpen ↗, two long journeys in South-East
Asia (some of it on extremely rough roads)
user.tninet.seCyclinginsoutheastasia.htmlOpen ↗, and some winter
riding in Swedish woods user.tninet.seEnglish.htmlOpen ↗. Had one accident in South
Vietnam, the tire exploded, and it became untrue. The present problem may have started there,
although I think it is more likely that I got a stick into it somewhere in the woods. Does not take
much bad luck to break any rim. My wife´s rims who has been through about the same are in perfect
condition.

Quoted message said:

I have more than double that on my current rims, with no signs of cracking. What part of "ceramic
rims are junk" don't you understand?

I think ceramic coated rims are more durable.

Per

In article said:

Quoted message said:

I guess you enjoy using rims that fail prematurely. 14000 km is an unacceptable life for a rim.

That really depends what it is exposed to. <snip> Does not take much bad luck to break any rim.

Rims shouldn't break unless exposed to huge forces- like getting run over by a truck. It is not bad
luck. Cracking around the spoke holes is a failure caused by poor rim design, and has become
depressingly common thanks to rims being designed by marketing departments rather than engineers.

<snip>

Quoted message said:

I think ceramic coated rims are more durable.

They aren't. But then you could Google-search this newgroup for about 35,000 posts on this topic in
the past 10 years. It's really not worth going into yet again, IMHO.

Quoted message said:

Rims shouldn't break unless exposed to huge forces- like getting run over by a truck.

Or sustained braking when riding in dirt.

Quoted message said:

It is not bad luck.

Getting a branch into a wheel is rarely done on purpose.

Quoted message said:

Cracking around the spoke holes is a failure caused by poor rim design, and has become
depressingly common thanks to rims being designed by marketing departments rather than engineers.

???

Quoted message said:

Quoted message said:

I think ceramic coated rims are more durable.

They aren't.

I find they are, mine have lasted much longer than other rims. However, of course, that is
impressionistic. Has some one studied it more scientific methods?

Per

Mavic - the 'Bose' of bicycle rims.

Chris Bird

"Tim McNamara" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Cracking around the spoke holes is a failure caused by poor rim design... <snippage of additional

commentary>

Finally, an inclusive/vague enough statement that Tim and I can agree on. ;-)

--
==================
Kraig Willett www.biketechreview.com
==================

"> > Cracking around the spoke holes

Quoted message said:

Quoted message said:

is a failure caused by poor rim design... <snippage of additional

commentary>

Finally, an inclusive/vague enough statement that Tim and I can agree on.

Without being a wheel engineer I think it is safe to assume that there is a trade-off between
durability and weight.

Per user.tninet.seMTB.htmlOpen ↗

Per Löwdin said:

Without being a wheel engineer I think it is safe to assume that there is a trade-off between
durability and weight.

More accurately, there is a trade-off between prudent engineering design and "features" demanded by
marketing.
--
terry morse Palo Alto, CA terrymorse.combikeOpen ↗