Originally Posted by
VintageDude
I meant to mention that I'd rather not bother with valve extenders. To me, that's a band aid solution, and, even using Teflon thread tape, I've had trouble with inflating - air leaking, etc. Seems tubular manufacturers would jump on the deep rim bandwagon and make some tires to accommodate.
Not necessarily. A store can afford to stock $10. tubes with various stem lengths because they are relatively inexpensive. Trying to stock ~$100. tubulars with various stem lengths becomes very expensive. They would likely stock the most common length -- which may or may not be what you need. Better to have a standard length with inexpensive stem extensions for the deeper rims.