Google : ( threadless ) stem riser ...
If it needs more than that... CL it off ...
What usually happens is the knobbies are too slow, so thet gat swapped out fore some 1.5 street tires ... then the jumps bethween shifts are never right, they are either "too spin-y" or too "hard to pedal" , so road cass gats added... then there is no top-end, so a road crank is added ...
Sooo.... 200$ in parts and 50$ in labor, you have a decade old hybrid ... worth it only if you have a setimental attachment, or its something cool thats still made in the usa... otherwise, take save your 250 + whatever you sell that mtb for and put it towars a new bike.
Last edited by martinus; 05-05-13 at 06:49 AM.