Take a look at this classic Jamerson type bass line. Notice the use of 16th notes over a standard rock/r&b groove. Learn to feel comfortable with the placement of 16th notes on and off the beat by playing this line and transcribing others like it.

You can find Jamerson lines on most of the famous Motown hits or in the great book "Standing in the Shadows of Mowtown". The book is also a great tool for improving your sight reading.