Bit confused?!

This bottom bracket shell is now the only thing i am not understanding. I've had the threads checked and they are not 26tpi that raleigh used but, they are 24tpi which was used when carlton was their own company.

All i am unsure of now is what BB to fit. A carlton corsa frame with 120 rear spacing and miche primato track hub (42mm chainline) and sugino messenger cranks. Stated length to use was a 103mm axle.

Being a 71mm BB shell, what approach do i take?!! I can work out everything else with chainline, just not sure which BB will give me the best adjustment. English threads by the way. (sorry if thas obvious)

Once i got this cleared up it's the home straight i think!!!

Hmmm, I've got an old Raleigh frame and accoridng to SheldonBrown if the BB measurement is 71mm or 76mmthen the TPI is 26 not 24, if the BB is 68mm then it's a 24. I guess it may be different with your Carlton frame though as you've had it checked.

Check out further info here

http://sheldonbrown.com/raleigh26.html

If you need to get old style Raleigh parts including 24 or 26 TPI bottom bracket components you can get them here

http://www.cyclesofyesteryear.com/