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17 would normally be level with a horizontal top tube given ~73 degree head angle. You may find though that a 17 puts you a bit low, in which case a 6 degree stem looks fine too. Kalloy Uno stems off ebay are great value, come in a load of lengths and angles plus in black or silver. Label comes off easily with nail polish remover too - https://www.ebay.co.uk/itm/254235272089?hash=item3b319a6399:g:GiYAAOSwlUhbl3r9
you'll need a 1 inch to 1 1/8th inch stem shim - lots here https://www.sjscycles.co.uk/search/?term=stem%20shim
In terms of spacers either use 1 inch up to shim or shim whole way and then use 1'1/8th for all. If you do use 1 inch spacers a nice slim stem works best (like the aforementioned Kalloy!).
A quick query from an about to build an MGOOF person who is currently an MTBer.... (actually I won't be building it at all it will be given to a man who knows what to do).
I have a Columbus Minimal 1 inch steerer fork, looking at getting a -17 degrees stem and bar combo, wanting the horizontal stem aesthetic and from what I read here -17 is the correct angle? And maybe this a dumb question but doesn't that mean in some cases that the stem logo may be upside down?
I am looking at Zipp/ Deda stems, can someone tell me what 'spacer' I should be looking at to allow the 1+1/8th stem to clamp to the fork, and also what spacers to use to take up any vertical distance between headset and clamp?