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'+' facing forward. The top cap has an offset bolt hole, so you'll want the extra space (indicated by the +) at the front and the reduced space at the back.
If you look at your picture you can see by the shim at the bottom it's tipped back (to increase rise) and has the - at the front.Edit: taken from the tech docs
" NOTE: Use an offset top cap, with the top cap hole located to match the position of the shim, so that the top cap hole is in line with the steerer tube plug
threads. "
I guess if you sight through the top cap and check the hole lines up with the thread then you should be ok.
hamrack-
I'll have to have another look at mine tonight - I think I've got it arse-about.
Mine is the opposite to that picture - my stem is dropping the bars but I've got the top cap such that the '-' is at the front. It seemed right at the time for some reason.
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I've just had a look and mine is actually '0', so the shim is flat, not angled. I guess it doesn't matter then - or I could just use a normal flat top cap in place of the angled one.
hippy
That doesn't answer my question. Is it + forward or back?