Hey Humans,
Riding home today taking a turn a bit fast I hit a pot hole and have some rim damage and need a new rear tire.

So the rims have a ceramic coating on brake surface is this fine to ride and my breaks won't chip off more of the coating?

or any repair methods would be great to hear.

Let me hear your thoughts

Thanks

Here are some photos

That's what I'm thinkin'. [Data banks indicate that humanoid life form objects frequently drop the trailin' g on some words.] Check whether the rim has been flattened in that region. More importantly, check whether the sides have been spread apart. This will cause a significant thump when that part runs through the brake calipers during braking. The surface chips and dents will probably cause some noise or thumping during braking also.

Whether you can tolerate it depends on how you ride. For runnin' errands it is probably tolerable. For faster or longer road runs, probably not. If it was on any of my bikes, with the possible except of one, I'd likely replace it. But if you can't feel a problem, then just check the rim every so often.

Thanks for the response guys. Not exactly what I wanted to hear about replacement though.

I will need to get the wheel trued up, but sides are straight and no dips in rim (no physical rim damage other than brake surface).

Is there no paint or compound I could fill in the gaps with and avoid replacing rim?

Chas is making it up .. he does not give accurate info, just an Opinion.

There was a plasma jet ceramic (think pottery) particle imbedding in the rim's black band ..

hard anodizing in the French Mavic code is 'CD' .. the dark grey surface is their CD treatment. not used in that case.

the ceramic abrasive brake track has chipped away in those spots.. no fixing that.

Yup. That brake track is doomed. Its going to go thump, thump, thump every time the brakes applied.

Bummer.

https://www.mavic.com/sites/default/f...Systems_GB.pdf

Scroll to page 29 of pdf....

I'd think the brake pads will self destruct or erode over a reasonably short period of time

I think to get me by I am going to try and fill in with a black epoxy and smooth it out level with other surface and see if thump, thump goes away and prevents any further damage.

Or if anyone has one they would be willing to part with 32H?

If you're using the bike for any serious riding, I'd replace it. Those chips will eat your pads. I wouldn't use epoxy on the braking surface.

Throttle back to a regular Open Pro Rim and rebuild the wheel.. a small de-tensioning, repeated, around the wheel, will keep it round ,

and Then is usable when there are no rim brakes.

Tape the New rim to the old, and moving the spokes over without taking the pattern apart will work .

The wheel is off my Tommasini which is my main rider just need to decide what to pull the trigger on.

New rim on the rear (need to decided if I can live with mismatched rims)
New replacement ceramic ($$)
New wheel set ($$)

Nothing you can do will make the rim any worse than it is. So, I'd say if you're willing to experiment, go for it.

You could try touching it up with something like JB Weld. Or, simply grinding the rough edges smooth and riding the bike as-is (after truing).

You still will have 99% of the original braking surface. As mentioned, your biggest risk is rapid brake pad wear.

Am with Jim & Bob on this one - the brake track is toast, therefore so goes the rim.

Velocity makes outstanding replacements in clincher and tubular flavors.

i'd buy a new rim with the same erd if the spokes are worth keeping.

if you can turn a nut, you can true a wheel. just read sheldon brown and make tiny adjustments. and you can simply use the upside down bike frame as a truing stand. really, anybody can do it given time, method, and patience.

Trued up the wheel last night and took her around the block. Braking was just not right.

I tried to see if the mavic ma40 rim i had laying around would work but rim depth is different and would need new spokes.

So I found and purchased what seemed to be the last mavic open ceramic rim out there (probably over priced) but in the long run I will have matching rims and won't have to get new spokes cut.

If you use the bike for commuting, I might consider looking for a decent set of used wheels and put the ceramic ones up for non-commuting duty. If you are patient, you will find a nice set of used wheels at a reasonable price.

They still make the mavic open pro in ceramic, I have two sets and they are going strong. 2 years on the one and there is only minimal evidence of braking. Dunno if the ERD on open pros match the open or not.