TromboneChat

Q: Do DE LB rims fit MB cups?

No. The threads probably won't fit (XB/LB do not), but even if they do the diameter where they meet will not match.

LB, MB, SB, EUPH and SYM all use the same threads but different interface diameters. So they will screw on but not match the rim to cup inside. You can do it to try different rim sizes, and it doesn't really affect the playing very much.

Thanks!