Hello,

For a tip that is 5.5, in mm 2.18 by my calculations, would you get a 2.2 or 2.4 mm tube top. I'd be ordering from overseas, so getting both not really an option.

Thanks,

Craig

I would order a 5.5 mm tube size, or 2.2 if that is the listing. If too tight you can loosen it a bit by inserting a tapered bodkin into it. But, a 2.4 will not be grossly large. So if concerned about a 2.2, order the 2.4.

Based on my experience, manufacturers are very careful about tiptop bore dimensions and blank tip diameters, and if the blank says 5.5, a 5.5 tube will work.

Tiptops are generally right on the money. Blanks, which are not precision machined but rely on much hand labor, can easily be off by a half 64th, sometimes more. Get the larger top and shim with a wrap of thread if needed. Or buy both. I doubt shipping would run more for two tops than just one.

..............

Standard conversion for tip top tubes sizes in 64th vs mm:
4/64 = 1.6 mm
4.5/64 = 1.8 mm
5/64 = 2.0 mm
5.5/64 = 2.2 mm
6/64 = 2.4 mm
6.5/64 = 2.6 mm
7/64 = 2.8 mm
Norm

Thanks All!

Craig

If you're ordering the blank with the tt, ask the supplier to fit it for you.