Cyclocross - Brakes with Sealed, Precision Pivots

I haven't worked with many cantilever brakes, but the ones that I have worked with were designed to rotate directly on the 8mm diameter "braze-on" frame post. Over time, the post can wear out-of round. I have more experience with V-brakes that mount on the same type of post but incorporate an internal bushing on which the caliper arm rotates. There is no relative motion between the bushing and the braze-on post, only between the caliper arm and the bushing.

I am concerned about wear and corrosion of the post and would like to know if there are common canti brakes that use a bushing or bearing to avoid damage to the post. How many of these designs actually use seals to maintain the bushing/lubrication and keep contamination out?

frm has a ball beared min-v ,thant works well
and it is super lightweight .128 gramm ,including everything .

paul components use a "o-ring sealed stainless steel pivot"

http://paulcomp.com/brkpivot.jpg

frm has a ball beared min-v ,thant works well
and it is super lightweight .128 gramm ,including everything .

SWEET! I like cartridge bearings.

I see they are made from titanium — I am afraid to ask the price. Probably cost more than Paul's. Do they make an aluminum version?

Do Shimano BR-R550 brakes rotate on the canti post or do they have an internal bearing/bushing on which they rotate (like Paul's, Shimano XT, etc.).

Ye olde suntour xc pro brakes pivot on a brass bushing. So do some models of older dia compe brakes, basically any kind where the return spring is internal will pivot around a bushing rather than the post. You can find 'em nos on ebay.

That's a good clue, I suspected that those with an internal spring probably had an internal bushing as well. Thanks!