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?
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?
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
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
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?
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?
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" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
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?
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.
1mm wall thickness is considered the safe limit, but some new rims barely have more than that. A reasonable test, because it's tyre pressure that causes the eventual split, is to inflate the tyre well above normal pressure and leave the rim overnight. If the rim hasn't failed by morning, let the pressure back down to normal and ride.
1mm wall thickness is considered the safe limit, but some new rims barely have more than that. A reasonable test, because it's tyre pressure that causes the eventual split, is to inflate the tyre well above normal pressure and leave the rim overnight. If the rim hasn't failed by morning, let the pressure back down to normal and ride.
This is good for new wheels too - it's like stress relieving your rims.
I've been running ceramics for >10 years now, they're nearly indesctructible. This includes 26" ceramics on my loaded tourer, which has been on some off-road tours in BC, OR, etc.
As mentioned, they last nearly forever, or until the nipples pull through. A very good value, compared to a regular rim.
-pete
<[email hidden]> wrote in message news:[email hidden]...
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made for what situation? dirt and mud or dropping into pot holes, curbs?
