24" vs. 26" tire

Since 2001, over 90,000 cyclist's have joined Cycling Forums to discuss topics from general cycling to equipment, training, racing and travel or vacation destinations (especially in europe during the tour de france). We also feature an great deals in our online store, 100's of articles, classifieds and product reviews.

I was wondering what the advantage is for having a larger tire, if any.
I'm just going to ride on the street about 15 miles round trip.
I'm looking at cheap used bikes on craigslist.
Do you have to work harder with a smaller tire.
Doug

Its part of bike sizing,

Crank length, frame size, wheel size etc...

24" MTB will be for someone below 5'.

For example, my GF is 4'11" and rides a 24" Huffy MTB and a Giant OCR XXXS with 650c wheels. :D

If all else is equal larger wheels will give more comfort and probably more stability.