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Tractor Pulling Discussion Forum

confused on tire size

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Dave in MN

07-16-2005 15:46:53

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I went to a pull today where the rules were "3500-5500# 14.9 largest and 6000-7500# 15.5X38 largest" I always thought that 14.9X38 tires were larger (square inches of tire on ground) than 15.5X38 tires. Am I wrong???

There were so many typo errors in the rules it really made it confusing.

I wish that ALL the pulls could use ONE set of rules!!!!!

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720Deere

07-18-2005 18:32:17

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Re: confused on tire size in reply to Dave in MN, 07-16-2005 15:46:53

If you look at how Firestone lists the tires on their chart you will see that they go from smallest to largest. The 15.5 is listed between the 13.6 and the 14.9 so they consider it to be smaller. When you are talking about one size larger than what came on an antique tractor the 15.5 designator really isn't applicable. The 15.5 size was developed at the end of the production of what we consider to be antique tractors. I consider the 15.5 to be equal to the 14.9 size wise.

If you look at the old charts, the 14.9 x 38 is a 13-38, the 16.9 is a 14-38. There is no old unit of measure match to the 15.5 x 38. Technically the 16.9 is one size larger than the 14.9 tire.

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Ohio puller

07-18-2005 15:57:29

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Re: confused on tire size in reply to Dave in MN, 07-16-2005 15:46:53

Here's one that will blow your mind!!!! I have a pair of 14-9\38 firestone field and road on 14\38 rims. I have a pair of 15-5\38 goodrich on 15\38 rims with less tread then the 14-9 tires and the 15-5's are taller and that is side by side. So now what I do is measure any tires I'm interested in and go with reality and they can keep there charts ect. My point is not all tires are the same even if it says same size ect.

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770

07-16-2005 18:20:50

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Re: confused on tire size in reply to Dave in MN, 07-16-2005 15:46:53

14.9's do put more square inches on the ground. The Firestone ag website has a tire data book with just about every tire spec.

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Jerry Cent. Mi.

07-17-2005 14:38:09

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Re: confused on tire size in reply to 770, 07-16-2005 18:20:50

According to the NATPA web site:
13.6 X 38 168 sq. inch
14.9 X 38 200
18.4 X 38 300
14.9 X 28 170
15.5 X 38 189
16.9 X 38 252
16.9 X 34 229
18.4 X 28 250

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Dave in MN

07-16-2005 19:12:28

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Re: confused on tire size in reply to 770, 07-16-2005 18:20:50

When I mentioned to the gentleman in charge that I was pretty sure that the tire charts had the 14.9X38 as MORE square inches of tire on the ground 15.5X38s, he told me that he didn't care what the tire charts said!!

What REALLY disgusts me is that I have been to pulls 3 times before that were run by this same gentleman and was disgusted with the rules and the way the pulls were run and I was still foolish enough to go back for more punishment!!!

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770

07-17-2005 05:46:06

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Re: confused on tire size in reply to Dave in MN, 07-16-2005 19:12:28

Hey, same up here and just about everywhere. Most clubs consider 15.5's larger, probably because they are wider. I always prefered the 14.9's myself.....But that's another topic for another day....

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MrH

07-17-2005 06:25:12

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Re: confused on tire size in reply to 770, 07-17-2005 05:46:06

Correct me if i'm wrong, but if the 15.5 is wider than the 14.9, how the heck does the 14.9 have more on the ground?? Pelase explain, I always thought the 15.5 had more on the ground.

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buickanddeere

07-17-2005 07:21:55

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Re: confused on tire size in reply to MrH, 07-17-2005 06:25:12

The 14.9 is less than .6 inches narrower than the 15.5 due to tread and sidewall shape. The 15.5 is a very short sidewalled low profile tire than stands inches shorter than the 14.9. The larger rolling radius of the 14.9 puts more tread square inches on the ground.

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