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Mower tire replacement mystery


ukrbyk's Avatar
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03-25-17, 02:48 PM   #1  
Mower tire replacement mystery

I am puzzled for two days already.
I have two mowers with:

18x10.5x10 tire mounted and
18-9.5-8 HF255 tire

Both have standard turf lug and slide on wet grass very easily. Least to say, puddles and mud get them stuck right away.

I started looking into mud tire replacement for what I have and here's my mystery.

I can't figure if same size tire will actually be direct replacement. As there is very confusing info: first number is inflated tire height. Ok. Second number is tire width. OK. But the third number becomes treated like whatever. Some say it is rim width. Some say it's rim diameter.
I already have wrong set to be returned and don't want to order another. They are not cheap.
So, if I have 18-9.5 8 HF255, does it mean that ANY 18-9.5 8 tire WILL fit?

Also, does it mean that 20x11x10 tire will fit 18x10.5x10 current size? As no one makes mud tires in that size.

Thank you

 
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03-25-17, 04:18 PM   #2  
Here is a tire calculator, Maybe this will help.
https://tiresize.com/calculator/

 
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03-25-17, 04:30 PM   #3  
Doesn't work for 18 inch tires. Won't take 18 10.5 10

 
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03-25-17, 04:44 PM   #4  
I've never worried about Rim Width on my lawnmowers; it would seem that the standard is

1)Overall Diameter; 2) Tread Width; and 3)Wheel Diameter.

What was wrong with the set that must be returned ?

Is the inside diameter of the 18-9.5 equal to 8" ?

If you mount a 20" Tire, make sure you have enough space inside the fender !

And your cutting blades will be about 1" higher than they were with the 18" Tire.

I can see that when I bought rear tires for my lawnmowers, I made some assumptions, and lucked out; hopefully I won't have to do that again. And because my mowers are stored in a barn, they're not subjected to the UV rays which cause early deterioration of rubber (especially sidewalls).

 
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03-25-17, 04:55 PM   #5  
I have wetland and have no traction on stock tires. And I MUST mow regardless of wet or dry, or I shall get caught bad. Been there.
Simply trying to get high traction mud/wet grass tires.
Ones I ordered turned to be too narrow for the rim. Can't mount. That's how I got into all this puzzle, if they go by rim width or diameter. And which diameter it is actually - edge or inner mounting flat surface as that is tire opening diameter.
I think I am good though. If numbers match, it should fit.
Thank you guys.

 
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03-25-17, 05:01 PM   #6  
Here's an ad on eBay for some tires that are 15-6-6.

TWO (2) TIRES Tubeless 15x6.00-6 Turf Tires 4 Ply Lawn Mower Tractor New | eBay

If you scroll down, you'll see that the intended rim width is 4.5"

So Rim Width doesn't play a role in the description 15-6-6.

But I would look at a few others just to make sure that's the convention.

 
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03-25-17, 05:14 PM   #7  
Yes, that's where it threw me off... Some sell "width" some sell "diameter". I am in between. Amazon is OK for returns but ebay....

 
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03-26-17, 03:24 AM   #8  
Is the inside diameter of your 18-9.5 equal to 8" ?

That would confirm that the convention is inside diameter.

 
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03-26-17, 06:41 AM   #9  
Donno till it is actually unmounted, right? I can try to measure the rim. On the outside.

 
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03-26-17, 07:21 AM   #10  
I just looked at and measured the inner diameter of a 18-9.5-8 tire and wheel I have mounted on the rear of a riding mower (without a tube).

That Rim's Diameter, lip to lip, is a hair over 9"; but the diameter of the ridge where the "bead" is located is only 8" in diameter.

I think the convention is that the 3rd number is the diameter of the Wheel's/Tire's "Bead Diameter".

Once you get that inner diameter figured out . . . . would a tread like this get you through those wetlands?

18x8.50-8 Lawn Trac Lug Traction New Tire 18X850-8 | eBay

 
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03-26-17, 07:37 AM   #11  
Thank you. **************************************

 
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03-26-17, 07:40 AM   #12  
Yes, they have them for $40 a pop on Amazon. Or, very similar design.
I'd go with Amazon as I have free shipping and return is a breeze on Amazon, instead of dragging through ebay.

 
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