Yes, it is possible to replace the existing tires of size 155/70/12 with tires of size 155/65/12. However, there are a few things you should consider before making the change.
The first thing to note is that the numbers in the tire size represent the width, aspect ratio, and diameter of the tire, respectively. In this case, both tire sizes have the same width of 155 millimeters and the same diameter of 12 inches. The main difference is in the aspect ratio.
The aspect ratio is a ratio that represents the height of the tire's sidewall as a percentage of its width. For the 155/70/12 tire, the sidewall height is 70% of the width, while for the 155/65/12 tire, it is 65% of the width. This means that the sidewalls of the 155/65/12 tire will be slightly lower compared to the 155/70/12 tire.
When changing the aspect ratio of the tire, there are a few factors to consider:
Ride Comfort: Tires with a lower aspect ratio generally have stiffer sidewalls, which can result in a firmer ride compared to tires with a higher aspect ratio. The change from 70 to 65 in this case may result in a slightly firmer ride.
Ground Clearance: Lowering the aspect ratio also decreases the overall tire height. This may slightly reduce the ground clearance of the vehicle, which could be an issue if you frequently encounter speed bumps or rough road conditions.
Speedometer Accuracy: Changing the tire size can affect the accuracy of the speedometer. When the tire diameter changes, the rotation speed of the wheels changes as well, potentially leading to inaccurate speed readings. It's recommended to consult with a mechanic or refer to the vehicle manufacturer's specifications to ensure the speedometer remains accurate.
Handling and Performance: Altering the tire size can impact the handling and performance of the vehicle. A lower aspect ratio tire may provide slightly better cornering stability and responsiveness but can also result in a slightly harsher ride. However, the difference between 70 and 65 aspect ratios is relatively small, so the impact on handling and performance is likely to be minimal.
Before making any changes, it's best to consult with a tire professional or a mechanic who can provide personalized advice based on your specific vehicle and driving needs. They can help you determine if the change in tire size is suitable for your motorcycle and provide guidance on any necessary adjustments or considerations.