I never knew this could happen

[Cheule]

Exactly the same happened to my wheel last September. One of my workmates asked if I was going to repair it

 

[PK99]

Riding in to work yesterday I felt the rear wheel start to 'drag' so stopped checked it over and found nothing obvioulsy wrong, couple of miles further on stopped at post box and wheel jammed solid at one point on the rim. Now I need reading glasses for up close work but I thought I could see the tyre had popped from the rim. Upturned the bike and then saw what you see below.

​

When it happened to mine (on the mtb) the strip of rim was 20plus cm long and wrapped it self around the brake caliper, stopping the wheel instantly - fortunately only going 1 0r 2 mph over kingston bridge and not 20 mph down hill as i had been doing minute earlier.

When it happened the tube ballooned out and exploded as i watched -with a traffic stopping rifle shot like sound!

 

[HLaB]

When it happened to mine (on the mtb) the strip of rim was 20plus cm long and wrapped it self around the brake caliper, stopping the wheel instantly - fortunately only going 1 0r 2 mph over kingston bridge and not 20 mph down hill as i had been doing minute earlier.

When it happened the tube ballooned out and exploded as i watched -with a traffic stopping rifle shot like sound!

Mine went similar to f-p's. Cycling up a steepish hill, I sudden found it getting very hard then impossible. The last time I'd used the bike, the day before I had been going down a steeper hill (about 28-30mph) then that hill about 18-20mph.

 

[Moodyman]

Lucky escape there OP

 

[Maz]

roll on disc brakes for roadies says I

Don't you mean Rohloff?

 

[Smokin Joe]

roll on disc brakes for roadies says I

+1

 

[twowheeler]

Crikey! More people experiencing this than I would have thought.


Are there different block materials which show a good coefficient of friction against the rim
yet impose less wear?


I guess the problem is due in part to the relative softness of the alloy rim material (compared say to steel)


Gordon

 

[andrew_s]

Brake blocks do make a difference. Koolstop are a lot better than Shimano.
Poor blocks can wear out a rim in 5000 (road) miles, less than the life of a front tyre.
Ceramic rims last 3 or 4 times as long as plain alloy rims.

You often get a pulsing in your brakes as the rim just starts to bulge - don't assume that you must have hit a pothole or rock and bent the rim flange a little, but stop and check. If it is the start of a rim split, let some air out of the affected tyre and go home by the most direct route, avoiding using that brake as much as possible. I've caught 4 like that without getting a blowout.

 

[rusky]

I'm a little concerned about the wear on rims but since I have scrubbed a set pf pads out in less than 200 miles I won't worr too much!

 

[iAmiAdam]

Why?

Callipers provide more than anything braking power, brake discs in the peloton will be dangerous imo.