Frame size is important, but the more time you spend on the bike, the more critical it is to have the proper fit.
The distance from the center of the bottom bracket to the center (it sometimes top) of the top tube is usually used as the frame size and is typically related to a rider’s inseam.
Normally the seat tube length pertains to the bike size
Bicycle fit is a very complicated subject and can be liken to discussing religion. There are usually as many opinions as there are people in the discussion but basically involves balancing 4 primary measurements: stand-over height, saddle height, reach, saddle placement.
From my perspective, the bottom line is that as long as the frame is not too large (can’t comfortably stand over the frame), the other three measurements can be adjusted (within limits) to fit the bike to you.
If you like the bike you bought (I assume you do), I would try to adjust it to you. A good bike shop can help you with this.
Frame size is important, but the more time you spend on the bike, the more critical it is to have the proper fit.
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