I finally squeezed a Shinko 230 150/90 -15 on the back of my S40. It did NOT just go on. I had to replace the side rail bolts with button head bolts and re-space the wheel and pulley. It fits under the fender, but not by much.( 6.25" wide ) With the Kaw. pulleys and big ass tire ( 78.25" circumference ) the odometer is now 23% off according to the gps.  Before anyone gets excited about such a big tire on a narrow rim, when I changed the rear pulley I installed a 3.5" aluminum wheel of a 02' Marauder so I could run tubeless. I was not happy the way the tire balanced at home and am thinking about using tire balancing beads to finish the job. I did a search about it and didn't find much. Has anyone got experience with using beads to balance a bike tire? They have glass, ceramic and plastic. I am leaning toward the ceramic after a few vids on UTube.
 On a related note, the bike seems happy now cruising at 60 at under 3400rpm. With one of Super Thumper's Harley mufflers I just love the way it sounds . A 55 to 70 roll-on is still reasonable in 5th, but I'm not trying to race anyone. If I cruse normal roads in the low 50's I am getting mileage in the mid 60's! With gas cheap now and retired, I am looking at some serious trips and mileage this summer.

Dave, the calculator says 79.059" (or approx. 6.59').

Dave, I have done both pulleys. And yes, as a matter of fact I DO just happen to have a metal lathe in my carport. It comes in handy when I am tinkering. If you are running a tire with a 79" circumference you would be geared just a little higher than me. Do a roll-out measure just for the hell of it. Do you have any clearance problems bottoming out on the fender? I put a 3/8" rubber spacer over the shock rods just in case and jacked-up the preload one notch. What did you do for a speedo? I did a overlay on the stock one and marked new lines as per the gps. Built a covered holder over the handlebar clamps to hold a android phone with a gps speedo app that works very well. I can adjust the color and brightness to my whims at night.
 Srotag, Thanks for the input on the beads. I am going to try the ceramic ones 2oz in the rear and 1oz in the front.(Damm that just sounded like some kind of code for a drug deal. No officer, I'm talking about balancing my tires.) Good luck with the 404's I just wore out a 130/90 - 15 on mine. I was happy with the handling and grip, but only got 7400 miles of easy cruising on it. About the same as on my PC800 a few years ago now that I think about it. When I took it off I found a 3" wire nail thru it! Don't know how long it had been there, but it never lost any air! I'm glad I went tubeless. I am hoping for 10 to 12 thousand on this 230 then I'll try a 777 HD.

Badwolf:

I have longer shocks on my bike, and no rear fender.  And for those who wonder....the double Kawasaki pulley conversion moves the rear axle back almost to the limit of the travel....so the front of the swing arm has more clearance for the taller tires.

I have a GPS speedometer/tach combination from Speed Hut - so no problems with getting accurate speed readings.

Dave, Your bike looks sweet! I don't think I would want to tour on it thou, to each his own. I like the BIG headlight, and is that a bigger disc on the front?

I think I have got how to post photos, here goes..
.

you are posting a link to your library rather than a single image -v1

How about this..
the big ass tire

side view

old deflated, new inflated

nail coming thru

whole bike ready to go


As you can see by the pictures from this afternoon, FL. weather (mid 60's) aint bad for January!