its drilled for presta, and i use a presta on it, i felt it, and it did feel smooth. could it be something with the tube shifiting inside the tire, and ripping the valve? i usually put those little screw things on the stem, maybe the tube is trying to shift/settle, and since the screw thing is on, its making it rip? becuse ive noticed the valve usually sits a little crooked

could be. I like to slightly inflate the tube when I put the tire on, it gives the tube a little structure. Then carefully inflate it. Then deflate it. Then inflate it again. That way you can make sure that the tire and tube are seated really well. Good luck.

sweet trials rig! i just sold mine a few weeks ago because i never rode it, and so i could afford a new MTB. funny thing is, now that it's gone, i'm totally pining for some trials action. oh well, such is life...

thanks for the pumping tip!

thanks! i love my trials bike, its soo much fun to ride, to bad you sold yours, trials is so fun, i dont see why everyone else doesnt ride it?