About Neffice 27.5 mountain bike What does 27.5 inch bike mean? If you haven't caught on by now, 27.5 is the diameter of the wheel in inches which makes it obviously smaller than a 29er wheel. Since the 27.5 wheel is smaller than a 29, but larger than a 26, this makes the bike very easy to throw around, accelerate, and manual. Ideal For More experienced rider looking for a high-end Hardtail + Rider getting into Mountain Biking and looking for a good value bike with decent components + A commuter rider looking for a bike to ride to work, but also take off-road on cross-country trails