Here's a tire I was fortunate to have had the opportunity to purchase. The previous owner/rider is a well known master pipe builder.
Here is Kenny Roberts at his craft.
This tire was mounted on Kenny's ATC 250R for quite a while. I saw a picture of it and new it was special due to the red/pink-ish stripe on the side wall. I'm told by a former team rider that color signifies extra plies in the tire. This is a sneaky trick works tire that reads 23.5X8-11, but is fat and lower profile while still being for a stock rim. The very outer most nobbies were buffed off to help clear the forks.Here it is compared to a stock Ohtsu. This tire never had dimples like a stocker, only 3 narrow wear dimples. The tire does have wear and a little bit of dry/weather cracking, but I was real happy to persuade it off Kenny's bike. I traded him a NOS tire to keep his machine track worthy. Thanks Kenny!
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Please, please, pics! Always want to see more hand cut team tires!! 
Oh Pete, its been over five years since I've ridden a three wheeled R. Sad to say, but they never stay put together here. I always start to build a "rider", then several years later it's beyond the original intention. Still got one spare, I'm slowly trying to build the theoretical "rider". I'm planing a trip soon to CA to stay with Kenny and Rob for a week or so. I can grill Kenny on the performance factor since he'll have had a stock tire for a while........ Gosh, it would be fun to take a couple bikes to Ashtabula and "play" race in full retro Hondaline gear.
Or better yet, get somebody who could show full potential.