Noob to the darkside with another stupid question....

I own a 92 flhtcu/tle-ultra I am very tired of replacing my MC tire every season or every 3000+ miles. I have heard about the darkside through the sidecar.com web site.  
 
please help me figure my M/C tire to car tire size or tell me how to do the math....

Tire size MU85 B16 77H
Any information will help.

Thanks and have a great day
Ride safe

Your question is not stupid, your just not informed. Lots of members with the info your looking for . Hang tight.
Take care, be safe.

Your MU85 B16 77H equals a 140/85/16. I'm not really up to speed on 22 year old Harleys, but I don't believe you have much side to side clearance.
The narrowest 16 inch car tire I have heard of is like a 175mm width, it might work if you can find one. Good Luck