Surron Ultra Bee 19" Rear Tire option: Motoz Terrapactor S/T 100/90 19 Part 1

Hi, Ultra Bee riders. Against conventional wisdom I decided to try an install of Motoz Terrapactor ST 100/90 19 (I might have said in error this is a 90/90 19, but confirm -- it's a 100/90 19.) on the rear of my otherwise stock bike. I chose to test this tire because its diameter was slightly less than other 19" options, raising the rear end of the bike exactly one inch. As you can see, it fits the UB well side-to-side. There were a few considerations in my testing:
* How does rear-end raised 1" affect trial riding? Answer: I definitely felt as if the front wheel had "more focus" but it really didn't wash significantly. The single track conditions were pretty dry, so more testing in wetter conditions needed. See below on future Tusk front tire.

* How is the traction? Traction on this tire is crazy good. You could hear the individual knobs just grabbing and tearing the "terra." It was extremely easy to get the front wheel up over logs, etc. Going up long, loose--rock-laden hills allowed you to pretty much lighten the front tire and thereby straighten your line! (Hard to explain, but hope that makes sense.)
* I have ordered a Tusk Recon Sticky 19" Tire from @ChargedCycleWorks , the front can benefit from better traction. Like and subscribe for updated review. :)
* Why not add a 21" front? I may. I wanted to give the 19" options a good go before jumping to 21". I have no doubt I'd love it, but I am very curious to learn if 19" is better suited, even, than a 21" in tight, rutty, loose shale single track. If anyone wants to send me a 21" rim and tire, I'd be happy to test. :)
* Why not go with 16" in rear and 19" front? I run into deep ruts and my thought (always evolving!) was to keep ground clearance.
* Why not go with 18" in rear? This would involve buying a new rim, and IMHO the 19" Terrapactor circumference and weight would not be "all" that different than an 18" option, excent money-saving. According to Motoz ("Moe Taz") the Terrapactor ST 100/90-19 tire weighs approximately 4.31kgs, 9lbs 5 oz.

Let me know your thoughts and questions below. Oh, the Terrapactor is a fairly expensive tire, over $100, typically --

There are many other Ultra Bee riders, and I respect all the thoughts of others! As indicated, at my "advanced age" I am still open to learning. Absolutely love the Ultra Bee! Happy trails!