It takes practice to use a slow shutter speed 1/60th or 1/125th of a sec., and get the bike crisp. You must pan perfectly with the bike. Some lenses that have image stabilization will have a setting for stabilization during panning. I got a lot of practice panning at the Rolex 24 IMSA race in Daytona. You will have a lot of misses, but the ones that you do right are really good shots with a crisp, sharp image of the car or bike, with nice background blur and wheel blur. Really empasizes the speed of the vehicle.
I spent most of my money on guns, motorcycles, women, and whiskey. The rest, I just wasted!