# Confused about frame size [duplicate]

I am trying to determine the right frame size for myself before purchasing a hybrid bike. My height is 174 cm and I have an inseam size of 85 cm. If I go by the height it should be a medium frame between 43-47 cm but if I go by the inseam height, recommended frame size is 58 cm! Apparently, the latter is wrong but I wonder why there is so much difference between two calculation methods.

• Does this answer your question? How can I tell if the size of a bike is right for me? Apr 26, 2021 at 16:27
• Does this answer your question? Is there a preferred frame size calculator? Apr 26, 2021 at 16:28
• Short version: you can't really go strictly by either inseam or height. Bodies mix those in all sorts of ways, with different ratios, and different geometries being ideal. "I wonder why there is so much difference between two calculation methods" -- because they are based on averages, not on your specific combination of inseam and height. Apr 26, 2021 at 16:29