Originally Posted by
Papa Tom
If you're talking a 20" wheel, then the bike is too small for the average grown-up. If it's a 20" mountain bike frame, it may be too BIG for you.
My newest bike has 20" wheels, and I'm 5'10"...of course it's a Bike Friday folding bike....
Seriously, though, to answer this question we need a little more information about the bike model. $149 could be a great price on a one-year-old Raleigh MTB in good mechanical shape, depending on the model. Be sure to inspect the frame and the wheel rims carefully for any signs of damage.
Mountain bike frames do tend to be sized smaller than road bike frames, but if the bike is going to be ridden on roads and paths, 20" might not be too large. My old hybrid has a 19" frame and fits fine. My road bikes are 22" and 23" (the latter is a touring bike with a lower bottom bracket).