Originally Posted by
smontanaro
I mounted them on rims to stretch yesterday and pumped them up to 3.5 bar (~ 50 psi). When I checked on them this morning, my thumb test suggested they'd not lost much air. I thus conclude that the ProTours have butyl tubes instead of the latex tubes in the dear, departed Vlaanderen. *sniff*
ProTour
https://www.veloflex.it/en/tubular-t...r-gum-sidewall
https://www.veloflex.it/en/tubular-t...black-sidewall
Tubular with a very soft 320 TPI (Threads Per Inch) Corespun casing and an innovative compound that provides very low rolling resistance and great roadholding. It is equipped with an anti-puncture protection belt and
an exclusive latex air chamber, for improved elasticity in every condition.
Technical details
TPI (Threads Per Inch) 320 Threads Per Inch (120/cm)
Protection Belt Calicot puncture resistant layer
Casing Compressed Pes/Co corespun
Rubber tread Natural rubber and silica exclusive compound
Inner tube Latex low rolling resistance
Valve Presta 42 mm with changeable core