Tires 336d tire size and other questions

[rScotty]

OK, I went out and measured the original tires and rims that came on our YM336D serial # 42514. The combination of rim and Ag tires below works well in 4wd. It gives 4.7% more rotation to the front tires than the rears - which is about right.

The Front tire is an OHTSU. Size is 8x16. Type is 4 ply Ag R1. Rim is D10JAPAN 16x6 UA mfg 3/85. .

The Rear tire is a Firestone All Traction Field & Road. Type is 6 ply rated Ag R1.
Size is 13.6 x 26, but molded by Firestone into the rubber beneath the 13.6 x 26 designation is the note "on 12" rim 12 x 26"
I'm not sure how the Japanese measure their rim width. The tire is still on the rim, so I can't measure inside of the flange that the edge of the tire compresses against. Measuring from the outside of that raised flange, the rim that Yanmar used with this tire measures to be a ABOUT a 12" width. No rim manufacturing numbers are visible.

Hope this helps,
rScotty

 

[normde2001]

Confusing. . . are you looking to replace tires AND wheels or just tires? If just tires, why not stick with the sizes you have?

 

[rScotty]

Confusing. . . are you looking to replace tires AND wheels or just tires? If just tires, why not stick with the sizes you have?

Apologies for the confusion.
Yanmar offered a lot of different tire & rim options. I think that the OP is not the original owner of that his 336D, so he is not sure if what he has is original. He needs tires, and was wondering if the tires that he has on it were stock, and also if they were giving him the proper 4wd ratio.

I went through the same thing a few years back and was sharing the information I found & measured.
The short answer is yes, his tires appear original. And if his rims are also original - and probably they are - then yes, the 4wd ratio is reasonable with those tires.
rScotty

 

[joswanson]

jUST THE TIRES BUT CAN'T FIND THE 13.6 X 26. IF I COULD FIND THEM I WOULD JUST REPLACE WHAT HAS BEEN THERE SINCE i'VS OWNED IT. YOU KNOW "IF IT AIN'T BROKE DON'T FIX IT" WORKS FOR ME.

jOE

 

[joswanson]

FOUND THEM NEAR ME AND THEY WILL BE INSTALLED AND LOADED IN MY BARN. THANKS ALL FOR THE INPUT AND ASSISTANCE.

JOE.

 

[normde2001]

jUST THE TIRES BUT CAN'T FIND THE 13.6 X 26. IF I COULD FIND THEM I WOULD JUST REPLACE WHAT HAS BEEN THERE SINCE i'VS OWNED IT. YOU KNOW "IF IT AIN'T BROKE DON'T FIX IT" WORKS FOR ME.

jOE

Did you see post #6?

 

[rScotty]

FOUND THEM NEAR ME AND THEY WILL BE INSTALLED AND LOADED IN MY BARN. THANKS ALL FOR THE INPUT AND ASSISTANCE.

JOE.

That's good. Just stick with the Firestone Field and Road tire in 13.6x26 (12x26 on 12" rim) just like the original equipment and you won't have to worry about matching the rolling circumference. For any other model tire - even one that says it is the same size - be sure to check rolling circumference.
rScotty

 

[PILOON]

OK, while on odd tire sizes----
I need to replace my 9.5 X 18 turfs (R3) and they don't make them anymore.
Since 18" rims I think my only option is 18" truck tires, but what size?

Diameter is given as 34 1/4" (870 mm) and rims are W8 X18

 

[yanmars]

I have a Yanmar 336d. I have owned it since 1989. It still has the original ag rear tires on it. I would have checked it but it appears you feel you are where you need to be, I am sure the rears on mine are 28 inch rims.

 

[yanmars]

I was at the farm today so I checked. They are 12.4 11-28. Bridgestones as I recall but did not check that.