I bought this PRO (Shimano) LT handlebar stem. However, I'm having difficulty decoding the instructions in which to tighten the handlebar clamps.
The stem itself has this piece of cardboard in between the top handlebar clamping bolts Which I assume is telling me to tighten the 2 top bolts first, so that there is no gap at the top of the clamp. Then proceed to tighten the bottom 2 bolts on the bottom to torque spec.
However, when I look at the manual, it says
- In case of 4 bolts: tighten always crosswise and evenly.
- In case of additional instruction is added between stem body and stem cap, follow this instructions carefully.
I'm familiar with the method above, but not so much the instructions on the yellow cardboard. How do i satisfy both conditions, in which I tighten things crosswise and evenly, while following the instructions on the clamp to tighten the top two bolts first so that there is no gap?
I've always been taught that gap differential in handlebar bolts is a bad thing. Is this just an exception to that rule?
Anyone know what I might be misinterpreting here? I'll be sending an email to the manufacturer as well, but just wondering if anybody had any insight.
So I've found some information on it. These two videos mention the existence of "zero-gap" stems.
A procedure with a zero-gap stems:
An article on stem variations:
The reason they seem to exist, reduces the risk of uneven tensioning, as there are only two bolts to worry about.
The procedure seems to be to tighten the designated side fully to spec (or just tight), then tighten the opposite side to torque specifications.