Chasing bottom bracket threads
 

Is there a tap the correct size to chase the BB threads on my Raleigh Sports? Are the threads 26tpi?

Yes, the Raleigh BB thread is 1-3/8" x 26tpi. Hozan and VAR made taps for this, but good luck finding one. If you just need to chase existing threads, sometimes a stiff wire brush is sufficient. If you need something more, you can sacrifice an old Raleigh cup set to make some thread chasers, e.g.:

http://www.os2.dhs.org/~john/thread-chaser.jpg