On 19/04/2017 9:43 PM, wrote:
I beg to disagree. On one of my favorite rides near Placerville, CA, going southeast on Buck's Bar Road, you descend 670 feet to the Cosumnes River in less than a mile. On a hot day, that will heat up my Mavic Open Sport rims so the heat is conducted up the metal valve stem and the tube fails at its base. It always happens just as you start the ascent from the Cosumnes gorge to the town of Somerset, so it is rather discouraging. Therefore I've made it a habit of stopping halfway down the descent at a Cosumnes River overlook to let my rims cool.


Disagree with what? Maybe copy a bit of what you're replying to...

I think you mean about blowing tubes with hot rims. I've done some
rides in New Hampshire with long descents and though I haven't lost a
tube, a friend did. In my case I could smell the rubber burning on the
pads but was able to let off on straights long enough to cool the rims
though it was a bit hairy. I expect out west the descents are probably
longer.