Mountain Biking - Another ripped off tube vavle

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View Full Version : Another ripped off tube vavle

killerasp
04-24-04, 09:29 AM
for the second time in a row..i manged to rip off the valve off my tubes.

http://web.syr.edu/~ayoung02/valve.jpg

http://web.syr.edu/~ayoung02/tube.jpg

ARGGG....it couldnt come at a worser time. KleinMp99 hooked me up with some awesome Michelin 2.5 tires and they felt awesome. I go out for a ride this morning and all i hear is PSSSHHHHHHHHHHH.

http://web.syr.edu/~ayoung02/wheel.jpg

I think im gonna have to buy a new pump cus the one im using is forcing me to push the valve at an angle thus resulting in tears at the btm of the valve. damnt. money i dont need to spend.

blueline
04-24-04, 09:40 AM
I experienced ripping a presta valve while pumping up a relatively new tube (Bontrager) on my road bike. The replacement tube (Specialized) came with a nut that keeps the tube from sliding back into the rim while pumping it up. I don't know why all of the presta tubes don't come with these nuts, as it would seem a simple way to prevent this very problem. Maybe, instead of buying a new pump, you need to look for this feature on the replacement tubes?
killerasp
04-24-04, 10:42 AM
I experienced ripping a presta valve while pumping up a relatively new tube (Bontrager) on my road bike. The replacement tube (Specialized) came with a nut that keeps the tube from sliding back into the rim while pumping it up. I don't know why all of the presta tubes don't come with these nuts, as it would seem a simple way to prevent this very problem. Maybe, instead of buying a new pump, you need to look for this feature on the replacement tubes?


yeah, i know what you are talking about. in both cases i had the nut in place holding the valve and it still ripped.

blueline
04-24-04, 11:45 AM
Oh well. I guess if you think about it, the exterior nut should help prevent stresses from pushing in on the tube valve, but not stresses from pulling on the tube valve.
smurfy
04-24-04, 02:40 PM
Tubes simply don't last forever. I put thousands of commuting miles a year on my ten-year-old Jamis Dakota that I don't even ride off-road and I believe the tube rubber ages and weakens around the valve stem and breaks. I have to replace tubes every other season whether they get punchured or not.
BlackDiamond
04-24-04, 03:54 PM
Well, I'm not sure if you know this or not, the nut on the valve should not be on there while you are riding. If your bike takes a big impact or under hard braking the tube will try to slide. If you have the nut on there it does not give it any room to move around.