Thanks John. I've looked again. I can't measure anything that resembles 110mm. If I draw a 110mm circle, it's clearly too large to fall on all the bolt centers. It's even a larger circle than is needed to go around the outside of the five arms.

There's only one circle too. There is precisely one set of five bolts and all three rings attach to those five. One diameter is used for all three rings.

Am not saying that 110mm is wrong. I'm just struggling to "see" it.