How does that gauge work then?
That deep groove is the rim wear indicator. Once it appears, it's officially time to replace the rim.So, on the excellent advice of @andrew_s I purchased an iwanson gauge to check out my rear rim wear.
It had been grabbing a bit breaking, which I *assumed* was because it's a bit out of true too, so I was intending to take to LBS for a retrue.
So, having taken it off, I have a look and fucj me, it's absolutely bolloxed, completely worn away to the hollow section inside around 2/3 of the rim!
The gauge, however, shows minimum 1mm thickness, so I'm not sure how useful it really is.
How the thing continued to work at all is a bloody miracle.
Anyone ever seen a rim in worse condition still rideable?
View attachment 500166
If the rims are spectacularly concave because the rim flange is starting to bend outwards, they can fail very quickly.I do, though, have a pair of "tough as old boots" Campagnolo Sciroccos, which are getting spectacularly concave, on one of my winter Bianchis. I think I will keep riding them till they go in holes!
Am I being thick here? Probably . But how is(are) the width(s) of the rim hook(s) taken into account?The pincers on the end of the guage go either side of the rim and the pointer at the other end registers the rim thickness on the scale.