two different animals
rembrandt,
When you're talking about 250 and 350 shafts, you are talking about CXL's. When you're talking 200 and 300 shafts you are talking CX and 3-D selects. The CX and 3-D selects are the same shaft for specs, except the 3-D have tighter tollerances.
The CXL (CXL-2) and linejammers are rated by the '50' nomenclature and are much larger in diameter. They are on the order of a 23 or 25 aluminum shaft while the CX are closer to a '20'.
I don't know about spine, but they are definitely diffeerent gpi ratings. You can see that right on the website. The diameters are listed as well.
Also, from a partical standpoint, the CXL 250's and linejammer 250's have thinner walls than either the CX 300 or CX 200's.
Thanks,
Casts