Hi,
I'm not sure of the size needed for the Fantom motor, but I'd guess the information is on the Fantom website.
Where is the bearing that needs replacement?
Can or endbell?
In the bearing in the can is generally a tight fit but you should be able to tap it out.
Same for re-assembly, but make sure the bearing sits in square.
If you can get / borrow one of these it makes it really easy to change the bearing.
Link:
https://www.rcmart.com/index.php?rou...&osc_sku=62692
MiCk B. :-)