Originally Posted by
F>T>R
Is the b44 front wheel the correct spacing for the B64d??

The hex is a different diameter but the offset matches. If you want to run b44 rims on the b64, just get a b44 frt hex and drill the id out to 5mm. Cheap easy and effective. I keep a set of drilled hexes in my pitbox to use up some b44 rims in practice.
Ray