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Thanks for info, so just to clarify - whether the stem is at the top , or it has a spacer above it (as Scilly recommends and is the case for me to acheive the correct stem height), either must be at least a couple of mm higher than the steerer to prevent the top nut bottoming out on the steerer , correct?
Nope, I think: there is some confusion on the part of one, or both, of us.
Best practice is that the steerer extends above the stem (around 2mm), to avoid the stem walking up the steerer (and in the case of a carbon steerer, crushing the top edge of it).
You can either use a conventional top cap and a 5mm spacer (both the same size as the stem), or one of Tester's top caps which incorporates a (from memory) 3mm spacer. A 5mm spacer is only specified with a conventional top cap, because you can't buy a smaller one (unless you buy Tester's custom spacer set).
Have a browse of Tester's top cap sales thread, he explains it better than I can.
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Scilly.Suffolk
Thanks for info, so just to clarify - whether the stem is at the top , or it has a spacer above it (as Scilly recommends and is the case for me to acheive the correct stem height), either must be at least a couple of mm higher than the steerer to prevent the top nut bottoming out on the steerer , correct?
Also, I'd like to make some spacers for below the stem that have the internal diameter of a 1" spacer and the external diameter of a 1 1/8" spacer , to give a cleaner appearance. This shouldn't be an issue as far as I can tell?
Thanks for the link Scilly , that's a nice clean solution.