Depends on 1,the motor you buy 2,what you plan to be doing with it 3,and your cash flow.

1. some motors have poor bearings from the get go (i am pretty sure all the motors Neal stocks you will be safe with though) so it can be a good upgade.

2. If you plan on bashing down the park there is prob no need, but it still would not hurt.

3. if you dont have the cash its not a big deal if you dont have them.

I run ceramics in all my race engines (just my personal choice) i find the motors spool a little faster and rev a little harder with them. Its not a huge difference from what i have found but it is there.

Ceramic or not you will love your clocked mill!!!!!