The Bajaj Pulsar 150 (2014 model) typically comes equipped with a rear tire size of 100/90-17. While it is possible to use a slightly different tire size, such as a 120/80-17, there are a few factors to consider.
Clearance: Verify that there is sufficient clearance within the bike's swingarm and other parts to accommodate the larger tire size. Ensure that the tire doesn't rub against any components or cause any interference.
Speedometer and Odometer Accuracy: Changing the tire size can affect the accuracy of the speedometer and odometer readings. A larger tire circumference may cause the speedometer to display a lower speed than the actual speed. Similarly, it can result in an incorrect odometer reading.
Handling and Performance: Altering the tire size can impact the bike's handling and performance. A wider tire might affect the bike's agility, cornering ability, and overall balance. It's important to consider these factors and how they may affect your riding experience.
It is recommended to consult with a professional mechanic or a representative from Bajaj to assess whether the specific tire size you mentioned (120/80-17) is suitable for your Pulsar 150. They can provide more accurate guidance based on your bike's specifications and potential modifications required.