Originally Posted by
rekmeyata
I bet you're pinching the tube between the tire and the rim, and not realizing it, latex is much easier to that then regular tubes. You need to cover the tube with baby powder then put just enough air into the tube to give it shape before installing.
Yes that is probable. I was having issues with the tube getting stuck between the bead and rim as I was trying to get them on. I thought I got them in but very possible it wasn't all the way (or could have been damaged by the pinching already. The butyl tube had no pinching problems at all though, perhaps its the rigidity difference between butyl and latex. I'll try the baby powder trick next time.
Originally Posted by
fietsbob
.. in the mean time.. I expect you dont "need" latex tubes ...
More common Butyl tubes suggested , till your installation skills improve..
Agreed. I didn't think that I "needed" them anyhow, just that they might help weight, ride quality, and speed on the bike I'm setting up for racing. Although I realize the difference is probably minor, just wanted the best for this bike.
Originally Posted by
FBinNY
It would have helped if you mentioned that the Tire blew off straight away, instead of the "tube popping".
Describing the issue as you did, is analogous to someone asking for help with a dog who keeps escaping the yard, without mentioning that they come home to find the dog gone and the gate open. Not mentioning key details has people looking at the wrong things, like holes under the fence, vs. a possible problem with the gate latch, or maybe kids who don't close it positively.
As you suspect, you have the cause and effect backward. The tire jumps over the rim at high pressure, allowing the tube to expand into the gap and burst. To be 100% clear, a tube CANNOT blow a tire off the rim, it's the tire blowing that allows the tube to blow.
Odds are that you're the victim of poor mounting technique, and the tire was not securely "latched" under the rim's hooked edge, so it worked it's way off when the pressure was high enough, or as sometimes happens over time.
After mounting, fill tires to 10-20psi and slowly rotate the wheel watching the reference line molded into the tire just above the rim. It should be the same distance above the rim all the way around, and it's often necessary to bleed air and massage the tire home before inflating to full pressure.
Often the tire won't seat evenly because some tube is trapped under the last section you pushed over the rim. This is one of the reasons I prefer to mount ending at the valve. Before inflating, I push the valve deep into the tire to pull out any section of tube that may be trapped, then push it back into place from the outside (do not pull the valve on thin tubes). Then to the partial inflate and check before going to full pressure.
With a bit of experience, the partial fill and check become unnecessary, but Murphy's Law applies, and once you get so comfortable with your own skills, that'll be the time you should have checked.
Well since you called me out on the order I mentioned things(and only the reason is I did not know the order of importance when it comes to bike tire failure, unlike your escaping dog analogy which would be much more obvious to the average Joe even), I'll call you out on one of my big pet peeves on forums is folks responding without reading all that was posted. Its annoying enough when something is posted in a follow up and missed, but especially so if the OP clearly explained it. But thank you for your detailed response. I was not aware of a reference line on tires, that will help immensely in the future. I was careful to seat it, and after the tire bead was on (extremely difficult for the final bit, that part was not necessarily done what I would call carefully) I inflated to 15 psi and gently massaged the tire as I slowly rotated it around all the way. The valve are of the tire was clearly having trouble seating and was popped up, I actually let a little air out of the tube and squeezed it a bit narrower and pulled it up a bit and massaged back down to get the tire to sit in the rim properly.
I may practice with the old butyl tubes putting on and taking off if I get some free time, before trying another latex tube. I'm however very busy at the current time and might just leave it the way it is until after the race I have planned in July but we'll see. Thanks everyone for the help! I just want to learn from my mistakes so I know better for next time.