Lets start with a little history of mountain bike wheel sizes. History not many know or have forgotten when they get into discussions about 27.5 vs 29ers. The first mountain bikes were introduced with 26-inch wheels. The main reason being, this was the size of the very popular cruiser bike’s wheel. Actualrim diameters of mountain bike wheel sizes. 26in = 22in. 27.5in = 23in. 29in = 24.5in. We just happened to have a wheel of each main wheel size lying around in the same place for once so we thought we’d grab our tape measure and see what the rim diameters actually are. The numbers above are the results. Useyour measurements and the chart below to determine your shoe size. Framedesign matters more, because a narrower 29" tire (say, 2.1) will be nearly the same size as a wider 27.5 (say, 2.6). Frame geometry, stem length, head tube angle/fork offset, rear-center, overall wheel wize are what make the difference in how a bike feels. The rim diameter is just one aspect of that. Thetotal difference between 29 and 26 is only around 10% change. The actual difference to any traction quality might be maximum 10 or 20 percent. Not enough to compromise control, but enough to make a major difference in the feel if you are a sensitive rider. Foldingbikes are the easiest to size – manufacturers typically stick to the “one size fits all” approach. And while folding bikes DO come in different wheel sizes (16, 20, 24, 26 and 27.5″ with 20” being the most popular), this doesn’t reflect in Thisis a comparison of 27.5 vs 29 wheel sizes. The 27.5-inch wheels are best for smaller rides, while 29-inch wheels provide more stability at high speeds. The 27 5-inch wheel size can be used for a variety of sports such as freeride, enduro, cross-country racing, trail riding, marathon racing, and more. The 27.5-inch wheel, also known Thereare major differences in riding feel and many different reasons for looking out for a 26 inch or 27.5 inch wheel still, so here are the differences. So if you want the 26 inch size there is still some hope. The two bigger sized wheels, the 27.5 inch and 29 inch, are dominating the market right now and have an extremely high demand for 854dfw.