Choosing the right size frame I'm planning to buy a bike. Based on my height (I'm 5 foot 6 inches / 167 cm) people suggested me to go for anything between 17"-18" frame.

When I calculated its coming as 17.5"

My dilemma is if I go for 17" (43 cm) as the frame is readily available is that right fit? Does 0.5" (12.7mm) makes a big difference in terms of comfortability and ride quality?



I'm looking for MTB or Hybrid. I'm 27 and my height is just below average.
Common wisdom is that upper body length, true inseam and riding style are important to bike fit, as is where/what you will be riding.

Riding offroad needs more frame/rider clearance than street or park riding.  You should have 4 inches/10 cm for true off-road mountain biking, and 1-2 inches (2.5-5 cm) for road or commuter riding. 

One of the better bike fit sites: http://www.competitivecyclist.com/Store/catalog/fitCalculatorBike.jsp