This is my third tube. Just 1 hour ago it got ripped. again. This is happening on the rear wheel. My front has it's factory tube and never had a single issue. My OEM tyre was Kenda with a 20mm or smaller valve,ripped. My 2 others we're specialized and well,you can see what happened. My rims are 29' Syncros and the tyres are Kenda boosters. Am i doing something wrong? Is my valve too stiff or too loose? I have truly 0 idea what to do anymore. Since on the front there's no issue,i don't get why the rear is ripping my tubes so hard.
by vumiqen
8 Comments
Please describe, in as much detail as possible, your method of placing the tube, mounting the tire, and initial inflation. Is there any sign of your tire rotating on the rim after mounting?
Are you using the nut that comes with the valve and possibly turning it very tight?
Did you get the tubes from the same place. I look at that and think abt a manufacturing defect
Seems like you are ripping it out through the rim by tightening the spirit out of the valve ring.
The tires are 100% the problem! I work as a bike mech in a store that sells Scott. They had an issue with the Kenda tires a few years ago. The tire would slide on the rim when braking (or accelerating) hard which drags the tube with it and breaks the tube just like that. Change tires and you should be good.
I don’t know how old the bike is but Scott used to cover it under warranty, at least in Sweden. We got new Schwalbe Smart Sam tires to replace the Kenda tires with.
Leave the valve strm base nit off or at least run up to lock against the dust cap. Ensure the calve stem hole in the rim is loose enough to allow the valve stem to tilt rather than rip off the tube.
The tyre is sliding around the rim under heavy braking pulling the tube with it. Try higher tyre pressure as well as removing the base nut.
What happens if you move the front tire to the rear?
This probably isn’t the way but I’ve had the same problem and mine was I rip the stem out when filling the tire. Namely removing the pump clip from the valve stem. Or when using a small manual frame pump (road side flat)
I now bottom out the nut on the valve to tube then put the stem through the rim and haven’t had a peoblem since. I do this both on my old 97 trek mtn bike and on my specialized road bike with 25c tires