Bearings are technically user replaceable- they are pressed onto the anemometer shaft and require some basic disassembly of the 5-in-1 sensor to access and replace them. I always say if you have ever installed spark plugs yourself, you could handle the assembly and disassembly of the sensor no problem.
We do not have any bearing kits at this time (fortunately we have not had many requests- bearings have been holding up very well so far in the field). We plan to make a bearing replacement kit available in the future. At this time, we suggest calling our customer care folks to help you out if you have issues with the bearings.
AcuRite Customer Care - Toll free: (877) 221-1252