50mm wheelsets - how do you pump them up?

[SquareDaff]

This is probably a daft question - but not as daft as not asking and I don't know the answer.
On a clincher wheel - given that you can get rims 50, 60 or 80mm deep and that the longest valve I've seen sold in Halfords (or anywhere) is 63mm long, then how do you pump these things up.

My track pump needs at least 20mm of valve showing to get an effective seal. The maths just don't work out.

I'm assuming a) you can get tubes with super long valves, b) there's some sort of cutaway or c) the shape of the inflated tube is "warped" from circular by the rim walls so that most of the valve still shows.

Can someone answer this question for me. Probably daft but then at least I'll know.

 

[Rob3rt]

You buy the longest valve you can get, if that is not long enough, you buy and fit valve extenders.

Disc wheels have a cutout to allow access to the valve. You cover the cutout with an adhesive patch.

 

[SquareDaff]

Thanks for that - was wondering how it was done.

 

[accountantpete]

I use valve extenders and shorter valves.

You can open the valve up with a long needle, screw on the extender and pump the tyre up.

Then remove the extender and close the valve with the needle.

Saves 10g of extra weight going round.

 

[black'n'yellow]

Saves 10g of extra weight going round.

I bet you really feel the benefit of that.....

 

[Rob3rt]

I use valve extenders and shorter valves.

You can open the valve up with a long needle, screw on the extender and pump the tyre up.

Then remove the extender and close the valve with the needle.

Saves 10g of extra weight going round.

That is a new extreme Sounds like a right mess on! Couldn't be doing with that by the roadside!

 

[SquareDaff]

That is a new extreme Sounds like a right mess on! Couldn't be doing with that by the roadside!

Can you imagine doing that in the dark?

 

[accountantpete]

That is a new extreme Sounds like a right mess on! Couldn't be doing with that by the roadside!

It takes 5 secs longer - day or night

 

[Rob3rt]

Whatever floats your boat, I am reluctant to even use tyre levers if I don't have to (although I carry them just in case), never mind piss about with needles etc (never mind carrying the needle and the valve extender, when I could just put it on the valve and forget about it

I am thinking of picking up some 50mm clinchers soon (for next year, will TT on them mostly but also the occasional RR - hence the 50mm profile rather than something deeper) while stores are trying to shift the 2012 models! Maybe Cosmic Carbones, not decided yet though.