The front MH90-21 tire and the 120/70/21 tire are two different cruiser tire sizes for motorcycles. The MH90-21 tire is 80 mm wide with a 90-height sidewall and a 21″ diameter.
The 120/70/21 tire is 120mm wide, 70 height sidewall, and has a 21″ diameter. The 120/70/21 tire is wider and has a lower sidewall height than the MH90-21 tire.
According to a comparison on tacomaworld.com, the 90/90-R21 tire is 0.24 inches (6 mm) smaller in diameter than the 120/70-R21 tire.
The speedometer difference between the two tire sizes is 0.9%. The difference in speedometer readings is not significant, but the 120/70/21 tire is wider than the MH90-21 tire, which may affect handling and stability.
When choosing a tire size for an aftermarket 21″ wheel, the most common size is the 120/70-21 reinforced 68H or 68V tire.
This tire size carries more weight and has more sidewall than the 130/60-Bias ply 21 tire, which is not a common aftermarket size for a 21″ wheel.
However, there are other tire sizes available for a 21″ wheel, such as the 130/60-B21 tire. The choice of tire size depends on the rider’s preference and the type of riding they will be doing.
The main difference between a front MH90-21 tire and a 120/70/21 tire is their size. The MH90-21 tire is 80mm wide with a 90-height sidewall and a 21″ diameter, while the 120/70/21 tire is 120mm wide with a 70-height sidewall and a 21″ diameter.
The 90/90-R21 tire is 0.24 inches smaller in diameter than the 120/70-R21 tire, and the speedometer difference is 0.9%.
There are different options available for 21″ front wheels, such as 120/70-21 reinforced 68H or 68V, which carry more weight and have more sidewall, or 130/60-Bias ply 21. You can find various brands and models of 120/70/21 motorcycle tires for sale online.
The pros and cons of using a Front MH90-21 tire are as follows:
Pros:
- Better performance in dirt and off-road conditions
- It can provide a more aggressive look to the motorcycle
- It Can provide better handling in certain situations
Cons:
- Less traction and control on pavement
- It may not be suitable for all types of riding
- It may require a specific rim size
- It may require a tube if not tubeless
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