Open Pro's Braking Surface Flat?

Hi All,

Ive recently picked up a 2nd hand pair of Mavic Open Pros (laced to DA 7800 Hubs). These were very reasonably priced and they have covered a reasonable amount of distance.

The rim braking surface is slightly concave, rather then perfectly flat. Is this part of the design or are the rims almost worn out (i expect the latter).

Thanks

http://www.roadcyclinguk.com/maintenance/minimal-bicycle-maintenance/4433.html

If you really want to nerd out you can buy a rim gauge on ebay for £5 to measure the thickness, or there is a thing you can do with verniers and two bits of wire to measure yourself.

I've got a CXP33 I used as a front wheel for a while that I rotated to use as a rear on my track wheels cos I wasn't sure about it. Rim guage would have probably saved me a purchase.

Below 1.0mm you should be thinking about replacement if continuing to use, @ 0.5mm definitely probably looking for new rims..

Thanks for the info above. There deffinately on there way out, but still have life in them. Will measure later tonight

Assuming they're the ones Chips had for sale a couple of weeks ago, they're definitely very worn and were (I think) advertised as such.

The braking surface on new Open Pros is machined flat, but having worn a few out to the point of the sidewall bulging, I've always found that they fail gracefully. If it were me, I'd just use 'em till they wear out completely.

They are the ones, he was honest when advertising and is a great chap. Just interested in how long the rims will hold up!

stick them on a fixie and dont use a brake ;) plenty of life left hehe

They are the ones, he was honest when advertising and is a great chap. Just interested in how long the rims will hold up!

Yeah, I picked up a frame from him and saw the wheels, but he wasn't open to being persuaded to sell them to me instead.

The way I ride (and brake) I'd probably be anticipating another three months (ish) on the front given reasonable but not massive mileage, but I'd make sure I had a spare rim in stock.

Hi All,

Ive recently picked up a 2nd hand pair of Mavic Open Pros (laced to DA 7800 Hubs). These were very reasonably priced and they have covered a reasonable amount of distance.

The rim braking surface is slightly concave, rather then perfectly flat. Is this part of the design or are the rims almost worn out (i expect the latter).

Thanks

All braking surfaces are flat - by the nature of their manufacture.

A concave braking surface is a classic sign of a well worn rim.

By the nature of Our Manufacture, Amen.

By the nature of Our Manufacture, Amen.

God bless god.