Originally Posted by
Jeff Neese
It simply means that the manufacturers have a different opinion than you do. They put them on there for several reasons, which I've already explained. It keeps the valve clean, provides protection, and it certainly looks better.
These are such ridiculous and false arguments in support of the useless valve cap, that I figure this is almost certainly trolling.
But I'll take them on, one at a time:
1. Manufacturers are pro-valve cap.
No, they aren't. See any valve caps in they marketing photos of their best bikes? Surprise, you don't.
Specialized:
Cannondale:
Trek:
2. It keeps the valve clean.
Irrelevant. A Presta valve doesn't need to be kept clean. A little dirt does not render it non-functional, and what dirt might be there gets wiped off when you unscrew the top nut.
3. It provides protection
Protection from what, sunburn? A Presta valve doesn't need protection, as long as the top nut is secured.
4. It looks better
A purely subjective opinion, one which is not shared by major bike brands and the vast majority of avid cyclists.