Original size tires on an Unstyled 1935 Model B -

Since you have 9-38 tires, the conversion was done after 1938. In 1957 tire measurements were taken at different places on the tire, so your 9-38 became a 9.5-38 tire in today's system. However, Miller Tire does not offer a 9.5-38 tire, the closest is a 11.2-38, which would have been a 10-38 pre '57. That should work fine on your rim. I would choose a set of those tires (they are available in different tread designs) rather than finding a 36" rim and changing to that. The unstyled B on rubber originally came on F&H round spoke wheels, and took either 7.50-36 or 9.00-36 (by far the most common). Note that the 9.00 size is NOT the same as your 9 - that measurement change occurred with the introduction of the wide-base tires. You can check out www.millertire.com for more details on tires available.

I remeasured and I believe these rims are 8" rims. If I'm measuring right. So you don't think an 11.2 tire is going to bulge much when stuck into that 8" size at the bottom? Just wondering again... I just want it to be as right as possible... don't want to make a mistake because these tires will probably be on it for at least the rest of my lifetime.

I also have a set of duals for the B. But there is almost no way I'll ever find tires for it. Nobody I've talked to has ever seen anything like them before.. they use 5-44 tires. Someone tried to buy them off me and my Dad about 20 years ago and we wouldn't sell them, but they aren't doing much good rotting in the shed either. The tires themselves look ok except at the bottom where they have been sitting on the same place for 30 years at least, but the tubes are obviously shot. Its dark in the shed they are in and I cant even tell you who made them, but nobody seems to even beleive me when I tell them about em.