
.......noticed the wear line of the front wheel of my Bowery has disappeared........
By the time you feel a pulsing from the brakes, the rim has already started to crack. Once the crack grows beyond a certain size, the whole flange will suddenly unzip and the tube will explode. This may not be healthy if it happens at the wrong time, to say nothing about sharp bits of rim flailing about. It's not a case of feel the pulsing and then start thinking about getting a new wheel; it's a case of reduce the tyre pressure and ride directly home, avoiding the use of the brake on that wheel.In my experience rims should be used until the rim wall starts to deform at the thinnest point which will be obvious when applying the brakes.
+1, especially on a front wheel.By the time you feel a pulsing from the brakes, the rim has already started to crack. Once the crack grows beyond a certain size, the whole flange will suddenly unzip and the tube will explode. This may not be healthy if it happens at the wrong time, to say nothing about sharp bits of rim flailing about. It's not a case of feel the pulsing and then start thinking about getting a new wheel; it's a case of reduce the tyre pressure and ride directly home, avoiding the use of the brake on that wheel.
I'm also aware of a couple of riders who've had a wheel explode at home without having noticed anything when out on the road.
The alternative is to keep checking the rim thickness at intervals (gauge). Those rims I've had fail have done so at about 0.7mm when checked afterwards. The normal recommendation is to get a new rim/wheel when the thickness goes below 1mm.
While eating through a straw when the rim gives way.You're talking my language there.
By the time you feel a pulsing from the brakes, the rim has already started to crack. Once the crack grows beyond a certain size, the whole flange will suddenly unzip and the tube will explode. This may not be healthy if it happens at the wrong time, to say nothing about sharp bits of rim flailing about. It's not a case of feel the pulsing and then start thinking about getting a new wheel; it's a case of reduce the tyre pressure and ride directly home, avoiding the use of the brake on that wheel.
I'm also aware of a couple of riders who've had a wheel explode at home without having noticed anything when out on the road.
The alternative is to keep checking the rim thickness at intervals (gauge). Those rims I've had fail have done so at about 0.7mm when checked afterwards. The normal recommendation is to get a new rim/wheel when the thickness goes below 1mm.
I do agree with you, and used to push my rims as far as possible in the days before wear indicators. However, with road bike tyre pressures at least, if you go past the groove you do have to keep checking your rims regularly rather than relying on your brakes giving you a reminder.I still stand by my assumption that any manufacturers wear indicators for rim wall wear will be extravagantly pessimistic about the remaining life of the rim. I guess it falls to personal judgement whether or not you are confident in making that call yourself or relying on the indicator groove. Just don't expect your rims to disintigrate the instant the indicator is gone.
). Some fixed fork drop outs don't have them but they're a bit belts & braces to protect the incompetent to reduce their need to sue and if you've done up you're QR right they are not needed.