Tire types and sizes

Steve_S · Nov 10, 2015

I've heard that the 11.2 tire of yesterday was wider than the 11.2 today. Any truth to that?

Trying to get my '46 A on the road and tire cost is an obstacle. I've found new 11.2 4-ply irrigation tires at decent prices but I don't want something smaller than stock. I'd rather go a step larger. This tractor will be used mostly for parades, hay rides, etc. No rough work. Am I on the right track?

Brendon-KS · Nov 11, 2015

The tire size didn't change but the designation and the way they are measured did. The modern 11.2
size is the same as the old 10 size - essentially it changed from measuring tread width to
measuring overall width. 11.2 would look a little small for an A; when the early styled A was
tested at Nebraska it had 11-38 tires which would be the same as today's 12.4-38.

Ray Durham · Nov 11, 2015

On my 1945 model A I bought new 12 x 38 rims from Miller Tire and new 13.6 x 38 tires from my local farm supplier. The tractor now sits a little higher in the rear which I prefer.

Ray
Warner Robins, Georgia

55 50 Ron · Nov 12, 2015

No truth to that as there was no "11.2 of yesterday". I think an "A" looks very good with 13.6 size. That would be equivalent to one of the
sizes available for it when it was new. I agree that 11.2 is too small and you would probably be disappointed with the looks.

Ron

Steve_S · Nov 12, 2015

Thanks all. Would 13.6 fit the stock rim of a '46 A? Used tires are really difficult to find in my area. So far I've only found 14.4 which seems a bit large for the rim.

Pete in MD · Nov 12, 2015

There's really no "stock" rim. Pressed steel rims came in sizes for 9,10 and 11-38 tires.
Rims for cast centers came in sizes for 9&10-36 and 9,10,11,12-38 tires. For 13.6-38 tires I'd think you'd want at least 11-38 rims. Others may say otherwise.

nlastovi · Nov 12, 2015

(quoted from post at 21:37:18 11/10/15) I've heard that the 11.2 tire of yesterday was wider than the 11.2 today. Any truth to that?

Trying to get my '46 A on the road and tire cost is an obstacle. I've found new 11.2 4-ply irrigation tires at decent prices but I don't want something smaller than stock. I'd rather go a step larger. This tractor will be used mostly for parades, hay rides, etc. No rough work. Am I on the right track?

http://www.millertire.com/faqs/ has a nice tire size conversion chart chart. As was mentioned, 11.2 is a modern designation (since 1955).

David G · Nov 12, 2015

I would get 13.6 for an A, 11.2 are too small.

buckeye al · Nov 12, 2015

I agree.

I have a '46 long hood for which I bought a set of Firestone 23? tires some 40 years ago. At the time I told the tire guy what I had & that it had (I think) 11X38 tires on it. He said then this here 11.2 is what ya need! Told him I thought that looked a bit small. He assured me otherwise and he was the guy working at the tire store when I was just a part time farmer & tree worker! I took it home. When I stood it beside the tractor, it looked like a bicycle tire!

Took it back & against his advice I took a pair of 12.4's. They still weren't as beefy as the originals but they have performed superbly through all these years both in wear and traction! They however look proportionally small (not ugly small but not quite right small) and if the ground gets soft he doesn't sink but... you won't have trouble following his tracks! If I had it to do over, I too would as Dave & others have said, go with the 13.6 on the A.

Later.

Steve_S · Nov 12, 2015

Many thanks. Best I can measure, my rims are 11" from lip to lip so that probably means 10" rim if they are measured like car rims.

The current (and ancient) 11.2 tires are mismatched, the wider of the two is about 12" overall

Tire types and sizes

Steve_S

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Brendon-KS

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Ray Durham

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55 50 Ron

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Steve_S

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Pete in MD

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nlastovi

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David G

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buckeye al

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Steve_S

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