I am buying my first road bike (technically second because I impulsively bought one too big (58cm) and it strains my neck).

The online guides seem to give a 53-55cm range for 5'6"-5'9". I am 5'7" tall and wear 30x30 in pants size.

Can I buy a 53cm, 54cm or 55cm frame? I read that I should aim for a 54cm but I'm buying second hand so I feel like I can't be picky.

Does the wheel size factor into sizing? 700cc vs 26in