29-inch vs 27.5-inch mtb wheels: Making the Right ChoiceUpdated a year ago

When choosing mountain bike wheels, the options boil down to 29-inch and 27.5-inch. Each size offers some distinct advantages depending on your riding style and preference for speed, agility, and stability.

29-inch wheels (29ers)

XC riders, downhillers, and trail riders. 29ers are great for maintaining speed in cross-country, offer smoothness for downhill, and provide stability and confidence for trail riding.

• Faster Speed Maintenance: Once a 29-inch wheel gains momentum, it keeps its speed longer.
• Smooth Over Obstacles: Larger wheels navigate over obstacles more easily, similar to how a larger bike wheel rolls over cracks better than a skateboard wheel.
• Stability at Speed: Thanks to a longer wheelbase and lower bottom bracket, 29ers are generally more stable when moving fast.
• Responsive and Agile: Modern design has made 29-inch wheels as responsive as smaller ones.

27.5-inch wheels

Agile and maneuverable bikes, particularly on tight, technical trails or those requiring substantial suspension.

• Quick Acceleration: These wheels pick up speed quickly, especially after slowing down for corners.
• Stable and Smooth: More stable and smoother than 26-inch wheels.
• Flexible Frame Design: Allows for tighter angles and smaller sizes, offering a more nimble ride.
• Strong and Responsive: Known for their strength, stiffness, and fun ride.

A wheelie short summary

• Acceleration: 29" is good, 27.5" is best.
• Smoothness: 29" offers the smoothest ride, while 27.5" is also good.
• Rolling Speed: 29" maintains the best rolling speed.
• Agility: 27.5" excels in agility, although 29" is also competent.
• Stiffness: 27.5" wheels are stiffer, but 29" aren't far behind.
• Stability: 29" wheels provide superior stability, with 27.5" also performing well.