Given that this post is 5 years old, Kelly may have changed their sizing.... according to their website,cjk wrote:Kelly offers several models in the smaller Eb shank size:
http://www.kellymouthpieces.com/kmstain ... /index.asp" target="_blank" target="_blank
Receiver diameter sizes:
Small-shank Tuba .55
American-shank Tuba .58
European shank tuba .59
Kaiser shank tuba .61
They have large bore trombone mouthpieces listed as the same receiver diameter as the small-shank tuba, which would agree with my ability to use the same VB 6.5 on my bass trombone that I do on my Eb tuba, except that I just ordered and received one, and it doesn't fit very well at all. It's too long and sets my pitch too low for me to compensate for. I was trying to see if a small tuba mouthpiece would be a better option than a large trombone one. The answer is yes, and no.
I need to measure my receivers. Then I need to go ahead and order the correct shank size from Bloke. I already have a solo cup. I'm starting to prefer the other cup/shank combo I have for my Bb anyway.