Anyone know center hub bore diameter (front only) 2013 GEM?

Finally found some wheels - anyone using plastic centering rings? I measure 580mm with my grandfather’s old caliper, which I don’t trust at all. Help?

I measured them at 58mm

Why am I off by a factor of 10? Did I fail grade school metric system? Well, anyway, it means the old caliper still works (kind of). THANK YOU!

25.5mm = 1 inch. so 58mm is just over 2"

No, I was for some reason being obtuse. Thank you for your help. They don’t make centering rings that diameter anyway, so I’m told, but at 35 mph, shouldn’t matter (though my wheels now are so out of round it’s maddening).