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Just got a set of the Mavic Cosmic Carbone SL...2 questions...

1. When using the valve extender..Do you leave them on all of the time or just when pumping up the tire and then take them off? If you do take them off is it OK to leave the nut on the presta valve open during a race/ride ?

2. Are the ZIPP valve extenders better then the rest..I have the brass ones that came with the wheels now..seem to work OK..but are a little tough to get out of the pump head on the floor pump. I use teflon tape on the tube valve..so having a good seal is not a problem

Any ideas or thoughts would be great...

Thanks
 
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