If you fit a Pulsar 220 rear tire with a size of 90/140 instead of the recommended size of 90/120, it would result in several notable effects:
Increased Width: The tire with a width of 140mm (instead of the standard 120mm) would be wider. This wider tire would have a larger contact patch with the road surface, potentially enhancing traction and stability.
Altered Handling: The wider tire could impact the handling characteristics of the motorcycle. It may provide increased stability during straight-line riding due to the larger contact area. However, it could also affect the bike's maneuverability, making it feel slightly less agile when cornering.
Clearance Issues: Installing a wider tire may cause clearance issues, especially in the rear wheel well and swingarm area. You would need to ensure that the wider tire doesn't come into contact with any parts of the bike's structure or components, such as the swingarm, chain, or fender. Insufficient clearance could lead to rubbing, potential damage to the tire or bike, and compromised safety.
Speedometer and Odometer Accuracy: Changing the tire size can impact the accuracy of the speedometer and odometer readings. The larger diameter of the 140mm wide tire would cover a greater distance with each rotation, resulting in the speedometer and odometer potentially displaying higher speeds and greater distances traveled than the actual values. This can affect your perception of speed and mileage.
Suspension Performance: A wider tire can also influence the suspension performance. The altered tire profile may change the way the suspension responds to bumps and road irregularities, potentially affecting ride comfort and overall handling.
It's important to note that modifying the tire size of a motorcycle from the manufacturer's recommended specifications can have various implications. These effects can be both positive and negative, and they depend on factors such as the specific bike model, riding conditions, rider preferences, and local regulations. It is advisable to consult with a trusted mechanic or tire specialist who can provide expert advice based on your specific motorcycle model and intended usage.