Lay a straightedge against the rim braking surface. As it wears, it will become concave. If it has started to actually bulge then it should be immediately removed from service and replaced because it is in active failure mode. However, the concavity can make it look like the rim is bulging when it isn't. The problem with trying to gauge wear by measuring is that most rim makers do not publish wall thickness.
Here's a photo of a rim sectioned like Jan suggests which gives a very graphic demonstration of sidewall wear. The amount of wear can be quite surprising! http://pardo.net/bike/pic/fail-026/000.html On Dec 5, 2011, at 9:26 AM, Jan Heine wrote: > For every rider, it is a good practice to check rim wear from time to > time. Some newer rims have built-in marks. Once these disappear, you > should replace the rim. Also, most rims start bulging outward when > they get seriously thin. You can see that with calipers. If the sides > of your rim no longer are parallel, then the rim is getting > dangerously thin. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
