Pickup height is a personal preference, however there are reasons for making certain adjustments. Below are standard measurements we use on a daily basis when setting up guitars. All are our own personal preference, so please feel encouraged to experiment...
All measurements are in 32nd's and 64th's of an inch and are taken from the top of the pickup pole and the bottom of the string (while pressing the string down against the last fret). The bass side represents the low E string and the treble side represents the high E string on a standard 6 string guitar. It would be the low E and high G for a standard 4 string bass.
Telecaster/Stratocaster/Jazzmaster/Jaguar/Mustang/Jazz Bass/P-Bass single coil pickups-
- Neck pickup: 4/32" treble and 5/32'' bass side
- Bridge pickup: 4/32" treble and bass side
TIP: Be careful with Strats especially, the pickups set too close can pull the strings and create a multitude of problems (3 pickups = 3 magnets on one string!)
Humbucker/P-90 adjustable polepiece pickups-
- Neck pickup: 5/64'' treble side and 3/32'' bass side
- Bridge pickup: 2/32'' treble and bass side
TIP: With adjustable poles, you can stagger them for the strings. Be careful setting the pickups too close for drop tunings and super heavy strings.
Keep in mind these are "general" specs, however they should yield excellent results and will act as a great starting point.
David Shepherd (Mojotone pickups and guitar parts manager)