Howdy all,

I have a very tall, steel mountain bike stem that is missing the stem bolt. The bolt needed is of the allen-head recessed head type. The 10" measurement is from the bottom of the head recess in the stem cap to the bottom end of the wedge.

I believe that 5/16" is the usual diameter of stem bolts, with 22 or 24 TPI pitch. The OD of the stem I have is 21.1mm (correct for the fork it's going in). I do have a 21.1mm wedge, threaded 22TPI. I could obtain another 21.1mm wedge with a 24TPI thread if the bolt I end up finding is made so.

Yeah, I know it would be easier to just buy a new stem with a bolt, but I'm trying to keep this cheap. The stem is for my girlfriend's old three-speed. She's quite tall, and wants a more upright riding position. I've already checked the LBS, including the Reno Bike Project, which has bins of such things.

Since it's unlikely a hardware store would have a 10" long 5/16" fine thread allen screw, I've thought of just using a piece of all-thread, with a washer and nut sitting on top of the stem cap. The problem is that I think that 5/16" all-thread usually is NC (18TPI). I suppose I could use the next size up of all-thread, and drill and tap the wedge to that thread size.

Thanks,
Darron in Reno, NV