The Advantages of Wider Tyres for Street Motorcycles

The trend towards wider tyres on motorcycles for street use has been notably on the rise. This shift is not just about aesthetics but also offers several practical advantages and disadvantages. This article aims to explore the benefits and potential drawbacks, helping riders make informed decisions.

Compatibility and Installation

Wider tyres, such as those larger than the OEM tyres that come with the bike, are definitely viable options for many riders. However, they do require verification to ensure that they fit the existing wheels without rubbing. If they fit, you are free to go for it. Be aware that such modifications can alter the handling of the motorcycle negatively. For example, turning into a corner may become more challenging with wider tyres.

The Skinny or Fat Debate

Skinnier tyres (like those on a low-powered machine) have less contact with the road and less friction, making them suitable for slower vehicles. Conversely, fatter tyres offer a wider contact patch, typically resulting in better grip and handling. This extra grip allows riders to take corners at higher speeds and maneuver more effectively. Therefore, the choice between skinny and fat tyres largely depends on the intended use and the engine's power output.

Performance Enhancements

A larger tyre on the rear can potentially increase top speed, especially if the engine has sufficient torque. With higher gearing, you can maintain lower engine RPM at highway speeds, which can lead to slight improvements in fuel economy. However, these benefits may be offset by the additional weight of the wider tyre. This weight can slow down acceleration, requiring riders to use the clutch during takeoffs.

A larger front tyre can improve straight-line stability but may make turning into corners feel heavier. In both cases, changing only one tyre size can imbalance the bike, resulting in weight distribution issues that affect handling and ride quality. Suspension adjustments are often necessary to accommodate the new tyre size and regain optimal performance.

Historical Context and Popular Choices

Due to changing motorcycle styles, wider tyres have gained popularity. Some bikes, especially cruisers and customs, have seen tyres increase from 180mm to 190mm a few years ago. These wider tyres provide a larger contact patch for better power transfer and less slippage, which is advantageous with modern engines. However, they can make steering less precise and steering becomes more sluggish.

Wider tyres are generally slower to turn but offer more stability in corners. This can vary by riding style: casual riders might prefer the stability, while those who enjoy quicker handling might opt for thinner tyres. Wider tyres, given their greater contact patch, can also provide better braking performance.

Aesthetic and Perception

The visual impact of wider tyres on street motorcycles, especially mega cruisers, is undeniable. They create a striking and intimidating image, which many riders find appealing for its "bad-ass" aesthetic. This trend aligns with the desire for more aggressive and powerful appearances, regardless of the practical benefits.

Overall, while wider tyres offer several advantages such as better grip, increased stability, and potentially improved fuel efficiency, they also introduce challenges such as weight issues, handling imbalances, and the need for additional modifications. Riders must carefully consider their needs and the specific characteristics of their bike before opting for such modifications.