Pulling Forum - tire size selection

tire size selection

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=63594
Printed Date: 23 Nov 2024 at 8:56am
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Topic: tire size selection

Posted By: mufflerboltz
Subject: tire size selection
Date Posted: 20 Jan 2013 at 1:23pm

Well i know alot of people prefer to ditch the smaller rims that cam factory and go with 38 in with, lets say a 14.9 or 15.5 tire. Fro m this i here allis' tend to do very well. But i remember growing up in the 80's and early 90's seeing people run a shorter and fatter tire, well around here anyways. So i guess my questoin is, i run (depending what track im on) either a 16.9-28 or 14.9. I found a set of 18.4-26 that i would like to purchase cuz of the good deal i can get on them and wondering if these would be any good for the 4 mph 20% over rpm class i want to get into? As for now i have my wd45 set up for a 3.5 mph 10% over class with 16.9-28!

Replies:

Posted By: Bob wi
Date Posted: 20 Jan 2013 at 10:41pm

sad to say around hear it's the width not the height that matters

Posted By: mufflerboltz
Date Posted: 21 Jan 2013 at 6:16am

so wider would be better?

Posted By: cotncrzy
Date Posted: 21 Jan 2013 at 6:56am

Seems everyone restricts width, on a good track a narrow tall tire will apply more traction than a wide tire. You get a long foot print with 38" tires. I have looked at lots of tires, I want to move up, but to gain the footprint nothing short of 38" will help much. I am running 16.9x26 on a WD and they work perfect in the 4 mph. The tractor runs 3.8 to 3.9 wide open, you never have to wory about the horn. With the 18.4, it could be done with practice.

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C, WD45,WD puller, 185, 200, 7060 Red Belly, 7060 Black Belly,8010, and a R52 Gleaner, AND PROUD OF THEM!

Posted By: Gary in da UP
Date Posted: 21 Jan 2013 at 11:17am

FYI, a 16.9X28 Firestone bias tire is 56" in diameter. A 18.4X26 Firestone bias tire is

57.4 " in diameter. Your ground speed with either tire is essentialy the same. Your flat plate dimension will rise from 209 sq. in. to 242 sq. in. To gain that footprint with a 38" tire you would have to step up to a 16.9X39 with 252sq. in. and a 66.3 in . diameter.

Even a 14.9X38 is 64" tall with only 200sq. in . of footprint.

I ran 16.9X26 Firestone 151 on the D17, old, hard and sharp . 38's would have gained me nothing. My .02

Posted By: mlpankey
Date Posted: 21 Jan 2013 at 12:29pm

Well it depends on the rules. For instance some rules say nothing bigger than a 15.5 up to 5500 lbs. So in that case a 16.9 or 18.4 26 is a hinderence . When you have 16.9 or 18.4 26 in the same classes as 16.9 38 or18.4 38 s the winners 38s plus i never seen a rule against widening the rims to reduce height.

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people if they don't already know it you can't tell them. quote yogi berra

Posted By: mufflerboltz
Date Posted: 21 Jan 2013 at 12:35pm

all good advice, but what im looking for out of the shorter tire is to keep my rpm up higher in the 4 mph 20% over rpm class where as with 38s i would have to lower my rpm to compensate for the 4mph rule! Also with the 18.4 26 i figured with the width i have more tire on the ground instead of running the 16.9 28s which would have less. thats what im thinking but if im wrong please correct me

Posted By: EricSWPA
Date Posted: 21 Jan 2013 at 5:40pm

I've always why no one runs the 30 or 32 inch tires should be cheap to buy used ones and I know caseih and a few others use 8 bolt centers I've been wanting to go to a salvage yard myself some day