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Tractor Pulling Discussion Forum

14.9 or 15.5 on 14 rim

Author  [Modern View]

12-14-2013 12:19:54

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Im currently in the market for new tires for my farmall m the class limits to a 14.9-38 max size. its a 3mph class. I have 14" wide rims and I was going to go with either the 15.5-38 firestone SAT 2's or 14.9-38firestone field and road's. would the 15.5 be a better choice because they a recommended for the 14" rim or would the 14.9's be a better choice. thanks in advance

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12-15-2013 07:54:58

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 12:19:54  
put the 14.9 on 16 in rims

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12-15-2013 07:27:03

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 12:19:54  
Go with the field & road regardles of what size you choose either will work fine on 14" rims'several in our club have tried Super All-Trac II no one still uses them.My favorite's Firestone old Deep Tread's,Firestone Super All Traction,Firestone Field & Road,Old BF Goodrich,and Old Armstrong's in that order,but that's my opinon.

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12-14-2013 17:51:45

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 12:19:54  
I don't like a 14.9 on a 14" rim as it balloons the sidewall out, many of the "real" tractor pullers will disagree with my thoughts on this though

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12-16-2013 20:19:05

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 Re: 14.9 or 15.5 on 14 rim in reply to dboll, 12-14-2013 17:51:45  
I agree 100% Doug. I have 14.9s on 12" rims and have had great results with them.

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12-14-2013 13:36:03

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 12:19:54  
Quoting Removed, click Modern View to see
I havn't looked at the charts lately but IIRC the 14.9 has more footprint than the 15.5. I have seen pullers very sucessfull with either.


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north puller

12-14-2013 13:34:54

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 12:19:54  
I really have no clear answer, but there is lots to consider here.

Do you have a rule that limits rim width to tire recommended size? If so, 15.5's go on a 14" rim. If you wanted to use 14.9's you'd have to narrow your rims.

If you can use any rim width you like, my personal preference is 14" or 15" for 14.9 tires, and 15" or 16" for 15.5 tires. So if you didn't want to widen your rims, go with 14.9's.

I also like the tallest tire you can run, so another vote for the 14.9's. I think that these would work well to get as close as possible to your 3 mph limit if your rpm's are limited. If you can run 20% or more rpm's, the shorter 15.5's might be the better choice to keep your revs up.

Lastly, both are a great tread for pulling, but i think the super all traction's have the edge. If there was such a thing as 14.9 super all traction, that would be the pick for sure.

Confused? :)

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12-14-2013 16:23:35

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 Re: 14.9 or 15.5 on 14 rim in reply to north puller, 12-14-2013 13:34:54  
there is no rim width limit and its a 10% over rpm limit. 99% of the tractors run the road and field firestones but you don't see any of the super all tractions until the 16.9's and 18.4's are allowed.

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north puller

12-15-2013 09:32:43

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 Re: 14.9 or 15.5 on 14 rim in reply to henryrit, 12-14-2013 16:23:35  
I'd go with the 14.9 on your 14" rims. Little taller tire gives you a little more speed. Should make a nice 3 mph tractor. You should be able to blow the horn in low gear that way.

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