Please do not go to your local bike shop, waste their time, get their expertise (?), then go buy online.
Figure it out yourself. Or borrow someone's road bike for comparison. Cheap and online means you take your chances, return it if wrong.
Get a professional fit if necessary, as suggested above.
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Vintage, modern, e-road. It is a big cycling universe.
Last edited by Wildwood; 02-15-19 at 08:25 AM.