The stock tire sizes for the Bajaj Pulsar 180 are indeed 90/90-17 for the front and 120/80-17 for the rear, both being tubeless tires. If you want to install broader tires on your Pulsar 180, it's important to consider the rim width and the clearance available within the motorcycle's frame.
Generally, it is possible to fit slightly wider tires on the stock rims without any major issues, but there are limits to how much you can deviate from the recommended tire sizes. The specific tire width that your rim can support depends on factors such as the rim width, clearance within the fork and swingarm, and the overall handling characteristics of the motorcycle.
To determine the maximum tire width you can install, it's advisable to consult with a tire specialist or a trusted motorcycle mechanic who has experience with Pulsar motorcycles. They can assess your specific situation, taking into account the available clearances and the compatibility of the wider tires with your motorcycle's handling and performance.
It's important to note that altering the tire sizes from the manufacturer's specifications may have implications for the motorcycle's performance, handling, and safety. It may also affect the accuracy of the speedometer and odometer readings. Therefore, it's crucial to seek expert advice and make an informed decision based on your specific requirements and the recommendations of professionals familiar with your motorcycle model.