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@Khornight2
On my pomp I managed 6 tooth difference without too much hassle, but most custom polo bikes have smaller drop outs.
Each tooth is half an inch, so will cause a quarter of an inch movement along the drop outs (slightly less because of the angle of the chain from chainring to cog), but you'll need a half link to get within a quarter of an inch of the ends.
I'm not sure if I understand what you mean by up gear mr standard, but the smaller your chainring the bigger difference in ratio you can get between flipped gears.