Anyone know the stem size on a servi-car is it 7/8 like the solo models?

 

Yes it is.

 

On springers yes. On Hydra 1". I have them both.

 

The servicars use the same springer as the big twins. Not sure if it was because the 45 solo springer wasn't strong enough or if it was because the bigger brake was needed. The 45 solo bearing cups will not fit in the frame neck.