Wake up! We out here in the hinterlands who are buying your tubulars are not gluing them to thirty year old Mavic GELs. Heck, they stopped making those rims in 2006 or so. 90% of the time your product is getting glued to 50mm deep dish carbon rims. 38mm valve stems and valve extenders are a pain. How about making tubulars with 80mm valve stems?