Help with Presta valves, PLEASE HELP!!!!

briggs28

Ive Recently bought a Rockhopper expert, its got presta valves.

Anyway first thing i did was buy a couple of slime innertubes, (i swear by them) changed them over. Inflated them, but they wont hold the air.

Also i brought a screw on adapter for my foot pump, so i could pump them up, but it wont inflate them . I tried it on the tubes i took out, and it inflates those ones but the pressure guage doesnt work!

What have i done, or doing wrong?

I also tried the foot pump on a schrader valve, and the pump works fine!!
So fustrating, new bike cant ride it!!!!!!! :evil:

jake_tenfloors

http://www.youtube.com/watch?v=9byRp9e2USU

Th3 Firestarter

Presta valves have a little "screwy uppy bit" on the top of them unlike schraeder valves, have you made sure these are done up?

briggs28

yeah ive opened the valve. Im gonna take em out and have a look. Hope i aint pinched them, at 8 quid a tube :shock:

Andy B

is the valve blocked with slime? if so push the valve a few times to clear the blockage.

Wheelieguy

I used to find with these valves when theyve been screwed up tight they stick, so when you undo the little screwy uppy thing, give it a press to break the seal otherwise it will stay jammed up and wont inflate, hope this cures your ailment!

tptvmbircn

I drilled my rims, sandpaperd where i drilled (all done carefully!) and used car types, hate presta's

a bit extreame but well worth it haha!

Rockhopper

I did the same when i bought a mountain bike the presta valves but i couldn't do it on my road bike as the rims are too narrow. Hate presta valves with a passion!

Stoo61

Not a fan of Presta valves either but the track pump I bought is easy to use with them. Not very practical to take out on the trail though.

When I buy new wheels they will be car type valves.