I know that multiple 36er tire options is a very recent development, but I haven’t seen any talk of narrower tires.
I’ve been riding my 29er geared up with a 2" wide tire, and it rolls over the bumpiest of roads. I’ve even ridden on bumpy fireroad with it, and its lightness makes correcting for bumps manageable even geared up with 125s.
Also, it seems to me that bigger diameter wheels need even less cushioning to handle bumps. So, why not make a 1.5" wide 36er tire?
I have wondered the same. I believe there is a demand for this.
yeah not sure, especially given the big demand for lighter 36 wheels
I think there was discussion about it in the “Coker redesign” thread(s) from a year and a half ago or so. Also me campaigning for a 42" wheel, also not so wide.
The danger in a skinny, lightweight but large wheel is it will be weaker. But for road use I think they would be okay. My 45" unicycle held up pretty well for many years with what was probably a 1 3/8" rim (Schwinn, steel, tubular = heavy) and wheelchair rubber for the tire. So road shocks were mostly transferred directly into the rim, and a few flat spots were created by big bumps or riding down curbs. But an air tire with sufficient pressure should prevent most of this…
I just want a narrower tire. I don’t think that will make the wheel weaker, just lighter and less forgiving on bumps. I feel that the current 2"+ tires are unnecessarily forgiving on bumps at the cost of being way too heavy. It’s analogous to riding a full suspension mountain bike on fire road trails. Sure, you can do it, but why not have something lighter for climbing.
Also, now that I’ve been riding my 42" gear a lot, I think it’s about perfect if I had to pick only one gear as long as the rotating parts aren’t made too heavy.
There are a huge range of 700c rims and 28/29" tyres, that go down to super-skinny. However, with a couple of exceptions (search the forums for Bacon Slicer) nearly everyone with a 29er seems to ride with a 2" or greater tyre.
If skinny tyres were such a good idea for unicycles, why aren’t more people using the ones that are available for for the next size down?
STM - In a Devils Advocate mood
I had a unicycle similar to the Bacon Slicer for a while and really enjoyed it. It was not that comfortable for long rides but the handling sure was crisp.
I would much rather tour with a 2.25" tire on a 36er but would put a 1.5 on my 36er in an instant if planning on using it for a race (like RTL)
it is the sacrifice of comfort for performance that deters most people from using a skinnier tire on their 29" road machines.
My 29er tire measures 1-7/8" wide and my 36er tire measures 2-1/8" wide. 
Because the Big Apple weighs a lot less than any 36" tire. Also the stuff about racing. For RTL, riders are willing to be less comfortable if they can be faster. This is much less a concern for long rides that aren’t a race; even the 100k several of us did on Sunday.
The Big Apple 2.0" is superior for road unicycling to the Big Apple 2.35", but that’s not because of weight; it’s because the narrower tire tracks better on slanted surfaces. I think the Coker “button” tire also doesn’t track very well on camber; the Radial TA is better.
(Aside: if you think these tires track well on camber, try hitting a cambered road section at high speed in geared mode. The fact that you learn to compensate for camber doesn’t mean that the tire handles it well).
I do think a 36x2.0", similar to the narrower version of the Big Apple, would probably be a nice tire.
Do you really think a 36x1.5 tire would be significantly more uncomfortable overall? How many people are pumping up their 36x2+ tires up over 40 or 50 psi just for regular riding?
What really got me thinking about this was that I initially had a Exiwolf 2.3 on my geared KH29. I rode it almost exclusively with 125s. When I switched to the 2" wide slick I’m using now, I found it to be even more comfortable because it became much more responsive.