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Was the nut too tight?(3 posts)

Was the nut too tight?taar44
Aug 16, 2002 4:45 PM
Had my first flat today after 500 miles of trouble free riding. Took me about 20 mins to replace the tube and get the tire back on the bike. The old tube had a little cut at the very base of the presta vavle. The tire had no visible cut. The vavle base cut seems unusual to me and i was wondering if it was because i had the threaded nut too tight or if it was just a cheaply made tube. Thanks.
Throw the nut away!!!!!!Kerry
Aug 16, 2002 5:02 PM
We certainly can't tell from here whether your rim has a burr that cut your tube, whether you put a bunch of torque on the stem when pumping your tire, or whether it was a defective or cheap tube. But we can tell from here that you have no use for the nut! One of the best tubes available is the Michelin - guess what, they are not threaded and so couldn't even use the usless valve nut. If cranking on the nut did cause your tube to fail (it can) then you have all the more reason to ditch the thing.
Did you make a hard turn just prior to the flat?Spoke Wrench
Aug 17, 2002 6:38 AM
Hard turns will deform the tire and tube. That tight nut locked the poor valve stem in place. Something has to give and it's the rubber at the base of the stem. I used to work with a delightful Chinese bike mechanic who refered to those nuts as "work of the devil." I don't use them on my own bikes, but I have to put them on customer bikes because the nuts come with the tube and people complain otherwise. I just don't put them on very tight.