Dang John, you put a lot of effort into changing a tire! Personally, I think I would have pait twenty bucks to getRdone.
Good tire choice by the way. Q's are my favorite tire of choice although the 15 you removed is a really good performer as well.
If you were skidding the rear on downshifts with your 15, your Q will do the same. You must be a hard charging dude to skid the rear using a slipper clutch?
You do have good engineering skills combined with mechanical ability. Congrats on your accomplishment!