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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
Fit is an incredibly subjective issue. The size of the frame is only one factor in fit. You then have to address stem length and height as well as saddle height and position. Geometries differ across brands so one cannot simply use height as a measurement as one's leg length will be the dominant factor. Firstly, what type of bicycle is this? Road or mountain? Secondly what is your riding objective? Competitive, recreational or commuting? These sites might be of some help. https://www.cyclingweekly.com/fitness/bike-fit/set-up-new-road-bike-370764 https://www.rei.com/learn/expert-advice/bike-fit.html
The frame model is an influencer of riding conform which you mentioned later in your comment.
I'm looking for MTB or Hybrid. I'm 27 and my height is just below average ;)
My suggestion for you is to take it simple by going to a store which offers bikes for test and then test the following before confirming the buy.
While you’re seated at a stop, your both feet should be kept flat-footed on the ground This isn't true in most cases
Old school answer is that when you stop you stand. You should have an inch of clearance from the frame and your crotch.
Under 1" is not significant difference. With saddle rails, sloped seatpost and different stem lengths or angles you can offset +- 2" in typical frame geometry. Over 2" might cause problem with steering as stem would be either very long or short.
It is unlikely you'd notice a difference between a 17" and 18" frame if saddle and stem were setting accordingly.
For a comfortable ride you really need correct frame size. Based on your height I think 50cm - 53cm frame size will perfect for you.
You can calculate your frame size by your height here.
Frame size is a very important issue, but don't stick to little details. That one inch will not really be the main factor of your final decision. You will be equally able to ride both with the right saddle height. What is very important Is for you to find and test some bikes around 17"-18" and choose one that will give you an upright riding position and won't force you to lean towards the bars to gain optimal control. Also keep that in mind: if you go for 29" or 27,5", 17" will be a better choice, but if you go for 26", 18" bikes will suit you better. Make a list with the bikes you are interested in, find sellers and test them. Don't be afraid to go for 29" or 27,5", 18" if you find a good bike. Changing a stem can fix everything. See ya on the trails!!
