I appreciate the offer, and I'll have to get back to you. I'm home alone, for the day, at my step-daughter's house, and am finding nothing in the way of a measuring device. It is a freewheel hub and 27"rim x 1 1/8. Spacing remains a mystery, though I'd be surprised if it's not 126. That said, the wider range seven speed freewheel I brought is too tight to function properly. It currently sports a 14-30 six speed.