Mavic X517 SUP gunmetal colour.

[drystonepaul]

Paul I'm interested to know exactly what you mean by 'worn through'.

The term 'worn through' means exactly that.

I have had two occasions I can remember where a rim has actually broken whilst riding due to excessive sidewall wear. Fortunately neither have caused any injury as both instances occurred at low speed.

A front one went while I was practicing track stands and kerb hops outside my house. The bang as the tube went was pretty impressive and a jagged 3 inch crack appeared along the rim braking surface.

I discovered that rear one had worn through during a ride when I stopped to check what I assumed was a buckled wheel. The rim side wall had been bent over by the tyre pressure.

A similar thing happened to Sinnett177 on a ride last year as pictured below.

In many parts of the Peak District where the mud contains alot of sand, the resulting paste is very hard and very abrasive. It's not an exaggeration to say that rear rims would only last for a winter's worth of riding before wearing out.
In the days before Mavic introduced the indentations inside the rimwall which indicate rim wear, you just had to guess how much longer they would last.
Being a student at the time I would try to get as much life out of them as possible before the cost of replacing them.

Nowadays, as you say, I'd reckon that rim which is concave to 1mm or more hasn't much life left at all.

 

[dyna-ti]

eventually

Coffee spraying moment there :shock:

 

[AdamAsh]

That reminds me to put up a picture of my D521 which I destroyed a few months ago.

Serious wear on it!!! Popped a hole right through.

Exactly the same. Saddleworth dirt!

Northern dirt is the toughest. Hahaha

Paul I'm interested to know exactly what you mean by 'worn through'.

The term 'worn through' means exactly that.

I have had two occasions I can remember where a rim has actually broken whilst riding due to excessive sidewall wear. Fortunately neither have caused any injury as both instances occurred at low speed.

A front one went while I was practicing track stands and kerb hops outside my house. The bang as the tube went was pretty impressive and a jagged 3 inch crack appeared along the rim braking surface.

I discovered that rear one had worn through during a ride when I stopped to check what I assumed was a buckled wheel. The rim side wall had been bent over by the tyre pressure.

A similar thing happened to Sinnett177 on a ride last year as pictured below.

In many parts of the Peak District where the mud contains alot of sand, the resulting paste is very hard and very abrasive. It's not an exaggeration to say that rear rims would only last for a winter's worth of riding before wearing out.
In the days before Mavic introduced the indentations inside the rimwall which indicate rim wear, you just had to guess how much longer they would last.
Being a student at the time I would try to get as much life out of them as possible before the cost of replacing them.

Nowadays, as you say, I'd reckon that rim which is concave to 1mm or more hasn't much life left at all.

 

[rc200ti]

Prepping a bike for a race late one Saturday night many years ago ( very many years ago) put more pressure into the rear tyre and couldn't understand why the brakes that had been perfectly set up earlier were now slightly catching. It took much bad language before I realised that the rim had been pushed out, and then even more bad language because I didn't have a substitute wheel .