My Journey with Mountain Bike Wheel Sizes
About 20 years ago, my dad bought me my first adult mountain bike. Although it was a pretty standard bike, it is still functioning today after giving me a lot of joy and riding many thousands of miles. However, since I moved to the United States, I gave it back to my parents and they are the ones using it now. How things change!
That bike had a wheel size of 26”. In fact, there weren't any other options back then. But a few weeks ago, when I decided I was ready to buy my second MTB, I discovered that I had different wheel size options and I didn’t know which one was the right for me. If you are in that situation, I am here to help. In this article, I will explain to you the advantages and disadvantages of the different MTB wheel sizes for adults and the one I chose.
Most Common Mountain Bike Wheel Sizes
26”
The original size, small and light compact wheel that can be built into a stiff structure without excessive spoke tension. It helps keep rotating mass down and allows for a nimble and agile wheel that can quickly respond to steering input. May work best for smaller riders.
27.5”
The equilibrium, it looks like it will become the new standard if it is not already. It offers excellent balance between grip, rolling resistance, weight, and acceleration.
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29”
The 29ers are heavier and accelerate slower, but have a larger contact patch, meaning they have superior grip. A lower angle of attack due to the larger wheel circumference also makes them far more efficient at rolling over obstacles, leading to a smoother ride quality when compared to the other two sizes. May work best for taller riders.
27.5”+ and 29”+
There is no difference in the rim size with the 27.5” and 29” wheels, but use wider tires (2.8-3.0˝ wide instead of 2.3”). This improves rollover capability, traction and stability. The backlash is a heavier bike with lower acceleration and speed.
Conclusion
A larger wheel size will have lower acceleration, higher maximum speed, and more stability and traction which makes it better to roll over any obstacles. On the other hand, a smaller wheel size will have better acceleration, better maneuverability, and are generally lighter and more durable.
In my case, I bought a 27.5” wheel size bike. I chose the middle ground because I have been riding a 26” all my life and, although I wanted to try a bigger wheel size, I didn’t want to lose the maneuverability. It is a personal decision and it depends on your needs. Whatever is your choice, enjoy the ride.