Cosmic Carbone rolling resistance?

John said:

I just purchased a pair of Mavic Cosmic Carbone wheels for my road bike.
The first thing I noticed is that the wheel (front), when spun by hand, does
not seem to spin nearly as freely as my other wheels. It will come to a
stop much sooner and have absolutely no roll-back when stopping. I can put
two bikes side-by-side and spin both wheels, as close as possibly with the
same amount of force, and the Campy wheel will spin much longer and have one
or two roll-backs. Even if the Mavic was perfectly balanced, it still does
not seem to descend as fast as my other wheels. I can tell this because I
ride with the same partner all the time and usually along a lot of the same
routes. This gives us a pretty good frame of reference. Yes, I have
adjusted the hubs to the point at which they as loose as possible, without
reaching the stage where there is play.

I guess my question is this: Is there anyone else with these wheels that
have seen the same results. Is the hub going to have a "break-in" period
after which it might be freer. Is seems like it might just be the bearing
seals that are creating the resistance, but I thought I'd ask the question.
I appreciate any ideas or comments.

It's how it behaves when loaded that matters. Do a rolldown test off a
slight gradient (e.g. a bridge approach) if you're worried.

I've owned Carbones since 1989... their bearings are remarkable. Very
smooth, very silky, much precision without run-in req'd.

Send them back to Mavic, this will give you an objective frame of
reference as to the quality for which you have paid.

John said:

I just purchased a pair of Mavic Cosmic Carbone wheels for my road bike.
The first thing I noticed is that the wheel (front), when spun by hand, does
not seem to spin nearly as freely as my other wheels. It will come to a
stop much sooner and have absolutely no roll-back when stopping.

Adjust the hub. But they do use cart bearings, with rubber seals, which
are draggy when compared to loose balls ala Campagnolo.

I can put

Quoted message said:

two bikes side-by-side and spin both wheels, as close as possibly with the
same amount of force, and the Campy wheel will spin much longer and have one
or two roll-backs. Even if the Mavic was perfectly balanced, it still does
not seem to descend as fast as my other wheels. I can tell this because I
ride with the same partner all the time and usually along a lot of the same
routes. This gives us a pretty good frame of reference. Yes, I have
adjusted the hubs to the point at which they as loose as possible, without
reaching the stage where there is play.

I guess my question is this: Is there anyone else with these wheels that
have seen the same results. Is the hub going to have a "break-in" period
after which it might be freer. Is seems like it might just be the bearing
seals that are creating the resistance, but I thought I'd ask the question.
I appreciate any ideas or comments.

ya said it all. They will get a wee bit smoother but you will have more
problems with the really draggy rear hub, BUT in the grand sheme of
things it is barely measureable when you are riding these. Their weight
is much more of a disadvantage than the smoothness but that too is
teeny.

Quoted message said:

John

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Quoted message said:

John said:

I just purchased a pair of Mavic Cosmic Carbone wheels for my road bike.
The first thing I noticed is that the wheel (front), when spun by hand,
does
not seem to spin nearly as freely as my other wheels. It will come to a
stop much sooner and have absolutely no roll-back when stopping.

Adjust the hub. But they do use cart bearings, with rubber seals, which
are draggy when compared to loose balls ala Campagnolo.

I can put

Quoted message said:

two bikes side-by-side and spin both wheels, as close as possibly with
the
same amount of force, and the Campy wheel will spin much longer and have
one
or two roll-backs. Even if the Mavic was perfectly balanced, it still
does
not seem to descend as fast as my other wheels. I can tell this because
I
ride with the same partner all the time and usually along a lot of the
same
routes. This gives us a pretty good frame of reference. Yes, I have
adjusted the hubs to the point at which they as loose as possible,
without
reaching the stage where there is play.

I guess my question is this: Is there anyone else with these wheels that
have seen the same results. Is the hub going to have a "break-in" period
after which it might be freer. Is seems like it might just be the bearing
seals that are creating the resistance, but I thought I'd ask the
question.
I appreciate any ideas or comments.

ya said it all. They will get a wee bit smoother but you will have more
problems with the really draggy rear hub, BUT in the grand sheme of
things it is barely measureable when you are riding these. Their weight
is much more of a disadvantage than the smoothness but that too is
teeny.

Quoted message said:

Thanks much for the info. I'll just keep riding and I think I'll do some
testing on a hill using two different wheelsets. Might be interesting to
see the descending acceleration rate and speed difference.
John

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