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Mavic CXP 33 ques.(8 posts)

Mavic CXP 33 ques.Wade03
Sep 9, 2003 5:54 PM
I have a new Ciocc on the way that has CXP 33 rims. I am ordering a spare tube and wondered if this rim requires a tube that has an extended (longer version) presta valve stem.
re: Mavic CXP 33 ques.torquecal
Sep 9, 2003 5:58 PM
A regular length valve stem will work - but perhaps not as well as you like. I have an avenir floor pump at home, with normal length stems on the tubes in my CXP33s I have no problem getting a solid connection... but the pressure doesn't indicate on the pump's gage as soon as I attach. Once I pump up to whatever the pressure is already in the tube I can see a fluctuation as the valve opens and then finish inflating normally. If something like this doesn't bother you then normal length valve stem tube will work.
re: Mavic CXP 33 ques.Wade03
Sep 9, 2003 6:04 PM
Thanks, thats what I thought. I am going from Open Pros to the CXPs. I hope they work out.
I use the extended valves.MikeBiker
Sep 9, 2003 6:12 PM
While a floor pump can be used with standard valves, I have not been able to get my frame pumps to attach with the standard valves. I use the longer valves to allow me to pump up the tires while on the road.

Me too.KG 361
Sep 9, 2003 6:36 PM
Conti makes a mid-length stem that works great. I think it's around 52cm as opposed to the 60 on most extended valves.
are you using the presta nut?ColnagoFE
Sep 10, 2003 7:21 AM
The nut can be screwed down on the stem to keep the shorter stem up so you can attach a frame pump. It is pretty hard (but not impossible) without one until you get some pressure up.
not needed but...ColnagoFE
Sep 10, 2003 7:19 AM
make sure you save at least one of those little stem nuts because attaching a pump to a flat with a standard valve is near impossible without one to hold the stem up.
re: Mavic CXP 33 ques.Andy M-S
Sep 10, 2003 8:46 AM
I use standard "whatever the shop has handy" tubes.

I have a Silca head on my floor pump, and while I sometimes have a minor problem with sealing if I don't position the head just right, it's nothing major.

I have used my frame pump (Zefal hpX) a couple of times with no problem at all.