trials tyre tube size

put a part worn michelin trials bike tyre on a old set of rims i use when doing alot of road work, pumped it up.. had to take it to about 40psi before it was anywer near hard enough to ride with... high i know...rode with it.. all good.. then went flat a little later

i used a heavy duty michelin tube... the same as i would put in my s12?

am i missing the point.. do i need to put some bigger type trials tube in or anything? or is this normal tube okay? no idea what trials bikes use.

Would think your going to need to put a lot of air into it to get it up/hard
(that sounds all wrong )
If you look at a trials bike they run very low tyre pressures they don't travel at speed and weigh a lot less than an enduro bike..... Im not making much sense here am i
Its a bigger tyre so needs more air

ye, i guessed that..had to put loads of pumping in to get any sort of hardness,

but before i fix the tube.. i wanted to check i wasnt doing something wrong.. like putting in some sort of trials tyre tube rather than standard, and having the same problem again.

may just shuv a normal tyre on rather than this, it seems to much hassle trying to maintain a hard one all the time, bloody rubbers :bounce:

No expert on trials tyres, but i do know of a bloke who wanted to use a tubless trials tyre on a conventionl rim, and then having to convert it to a tubless rim before it worked.
The one on my trials bike is tubeless and uses a rubber band thing with a valve bonded into it to seal the spoke holes. It also runs at only 4 to 6 psi on a bike weighing less than 70 kg.

I've used Pirelli MT 43's on a trail bike with normal tubes at 10 to 15 psi with no problem's but i think the sticky tubeless one's (Michelin x11 etc) are more tricky.
If it is a sticky one it won't last long either (seen one knackered in a day on a 400 endruo bike!) and it'll squirm around like buggery on the road too.