Rim wear

A while back a few people reported here about incidents where their rim
walls fractured. I understand that some current rims have wear markers
built into the sidewalls to let the user know when they should be
replaced, but my rims have no such indicators.

I don't want to have a rim failure while riding but would also like to
get as much mileage from my rims as possible. Here's a picture of one
of my front rims (the rear ones are only rarely used for braking and
have minimal wear):
http://home.comcast.net/~prathman/RimWear.jpg
It shows a definite concave surface but I'm not sure how close it is to
failing. Any suggestions on how to tell when failure is imminent?

The rim pictured is a Rigida 13-19.

Peter wrote:

http://home.comcast.net/~prathman/RimWear.jpg
It shows a definite concave surface but I'm not sure how close it is to
failing. Any suggestions on how to tell when failure is imminent?


Time to replace it! My rim looked about that far gone before it let go:
http://www.pacifier.com/~jwills/rite...s/rites042.htm

Jeff

measure yours then measure the one down at the LBS.
subtracked
usa shim. measure shim. subtracked.
the lbs will probabbbly show of his digital caliper if you go in on a
teusday mroning

measure yours then measure the one down at the LBS.
subtracked
usa shim. measure shim. subtracked.
the lbs will probabbbly show of his digital caliper if you go in on a
teusday mroning

Per Peter:
I don't want to have a rim failure while riding but would also like to
get as much mileage from my rims as possible.

Last weekend - on Philly's "Bell-To-Bell" ride, I saw one of these:

http://www.cannondale.com/bikes/05/cusa/model-5XR1.html

Dunno what the tradeoffs are vs a "real" road bike once you put hp slicks on it,
but it looks like rim wear is definately a non-issue.
--
PeteCresswell

Peter wrote:
A while back a few people reported here about incidents where their rim
walls fractured. I understand that some current rims have wear markers
built into the sidewalls to let the user know when they should be
replaced, but my rims have no such indicators.

I don't want to have a rim failure while riding but would also like to
get as much mileage from my rims as possible. Here's a picture of one
of my front rims (the rear ones are only rarely used for braking and
have minimal wear):
http://home.comcast.net/~prathman/RimWear.jpg
It shows a definite concave surface but I'm not sure how close it is to
failing. Any suggestions on how to tell when failure is imminent?

The rim pictured is a Rigida 13-19.

i'd say any day now. need to replace asap.

Jeff! what does the rim thickness measure near the blown section? like
before and after circumferentially and above and below in the blown
section's middle?

wrote:
Jeff! what does the rim thickness measure near the blown section? like
before and after circumferentially and above and below in the blown
section's middle?

if i understand you correctly, what wear can it tolerate? depends on
manufacturer, but about 0.5mm on each wall, or about 1.0mm total rim
width reduction. measuring a rim before use and keep a note of the
dimensions is a good idea for those riding in rain or mud.

best solution tho is to get a ceramic rim. they /are/ made for this
situation & last virtually for ever.

Concave is fine, convex is not. When the rim starts to go, the air pressure
of the tire will push out the sides of the rim. I've seen this happen twice
to my wife's front rim.

-Dion

"Peter" wrote in message
...
A while back a few people reported here about incidents where their rim
walls fractured. I understand that some current rims have wear markers
built into the sidewalls to let the user know when they should be
replaced, but my rims have no such indicators.

I don't want to have a rim failure while riding but would also like to
get as much mileage from my rims as possible. Here's a picture of one
of my front rims (the rear ones are only rarely used for braking and
have minimal wear):
http://home.comcast.net/~prathman/RimWear.jpg
It shows a definite concave surface but I'm not sure how close it is to
failing. Any suggestions on how to tell when failure is imminent?

The rim pictured is a Rigida 13-19.

made for what situation?
dirt and mud
or dropping into pot holes, curbs?