Gomexus Carbon Power Knob on 2019 Shimano Vanquish 4000Xg 

Yes it will fit fine even with the 2500 size

Is that wd40 u are using between the bearings?​@@bestthingsinceslicedrice

What about 5000 size is it gonna be too small?

​@@raj1634sorry for the delay since ive been very bust at work but it will fit fine as well. This knob is actually bigger than the factory shimano knob

Thank you for your suggestion but the reason I did not use the original bearings is to demonstrate that the kit has all the parts you need to do the installation to give viewers peace of mind if they decide to order this knob handle.

Yes its 38mm