When it starts raining it is usually best to:

Riding in the tire tracks left by cars is the best option when it starts raining because these tracks are typically drier than the rest of the road. Most of the water collects in the middle of the lane, which can make it more slippery and hazardous for motorcyclists. By positioning your motorcycle in the tire tracks, you can take advantage of the relatively better traction and reduce the risk of losing control due to wet conditions.

While pulling off to the side until the rain stops might seem like a safe choice, it isn’t always practical or safe to do so, especially on busy roads. Riding in the center of the lane can expose you to more slippery conditions, and increasing your speed can increase the risk of losing control, as wet roads reduce traction significantly. Therefore, riding in the tire tracks is the most effective way to maintain control and safety while navigating rainy conditions.