90 degree tyre valve stems

[jerryz]

I have several 90 degree valve stem adaptors kicking about in my garage , in my opinion they are useless as they never seal tightly and flap about on the wheel never seem to be able to get them to tighten up ,, i have tried them on my  ducatis and other bikes ,

a great idea and convienience if they could be made to work safely.

[garryc]

i also have a couple of the adapter things in the shed and I also find them next to useless.
I picked up my front wheel with new road 2 this afternoon and all they had done was screw one of the adapter things on. i told them they could keep it.
next tyre change I'll buy some myself and take in with the wheel.
In a way it was probably good as I asked them to install the 90 pointing the wrong way
Thanks for the info all

[RBX QB]

...
looks like I'm missing something here... whats the rationale?

Stems should be on right side of the wheel, so that when the bike is on the sidestand the angled valves point at more of a 120* angle aiding access filling, where if they were on the left side of the wheel, they would point down towards the ground when the bike is on the sidestand.

That. Easier access.

[Triple J]

30 years in the racing paddock and I'd never heard that one 

But they sure are nice for access around big rotors, mufflers, luggage, etc

Really? That's why metal caps with gaskets are required to pass tech. inspection for every motorcycle race organization that I've seen.

I'm with you on the access thing...straight caps are a pain in the ass.