Tire options for a wd

Looking for options an tires to put a a wd for pulling? Tractor will have gleaner motor with wd flat top pistons nothing crazy. What rims would bolt on and work best?

It is a straight stick. I was thinking 15.5x38's but not having much luck finding 38 inch rims. Was mostly wondering if there was a mother good option that might be easier to come by

I was going off the natpa div II rules. I was think about pulling between 35-5500lbs depending on what the lightest weight class is at the pull

Well, you need to get the latest rules for that Div 2 class. What I see is a maximum of 170 square inches of rear tire up to 4500 pounds. That makes a 13.6 x 38 your best choice (165 sq inch)and it has to be on a 12 inch wide rim as per the rules. No cut tires. Drawbar at 18 inches high (good for you) and 18 inches short.  10% over on the RPM (good for you) and 3 MPH max speed (good for you). Your speed will be probably 3.5 MPH so you'll have to learn how to drive and run half throttle coming down the track and increase the engine speed the farther you get to keep it at 3 MPH and not get DQ'd. I think your engine will be fine if it is tuned properly and the 18 inch drawbar and smaller width tires also work for your lower HP. The NATPA events I've been at usually had 3500-3750-4000-4250-4500 lbs......every 500 lbs for sure but the ones I've attended were every 250 lbs.

14.9 x 28 is 145 sq inches and meets the 170 sq max inch rule. They will be slower. They will take less HP. They will not finish well. 38 inch outpulls 28 inch.

PaulB wrote:  Pulling is a game of may variables, what works for someone else with lots of HP may not work for you with a stock engine. Tall tires are not always the best if you don't have the power to turn them. You may need to try many different sizes before you find the best match for what you have. Any tire you try you do want to be a s close the the 170 sq/in as possible. How many sq/In is a 16.9X28? That will gain you a little height and width over a 14.X28. As mentioned above the 13.6X38 tire , you'll have to run at part throttle until slippage increases and if you are too late trying to get the engine speed back up it may not come back.    Look on the chart and find all the tire that you'd be allowed to run for your lightest class and pick a rim diameter that is midway between the 28" and 38" . Might even try finding a 36" rim, That will allow a little more engine speed at the beginning of your pull and might match your stock engine better. There are times when using a tall tire you want to be narrower that the maximum allowable tire if you don't have the power for that ground speed.      Be open minded to make changes after you get started. Finding the perfect combination won't happen right at the start. Also be aware that most everyone else that has been pulling for awhile has already worked trough what your are just getting into. Even if you have the same tractor as someone else, there are going to be some differences that need to be allowed for, most of which the other guys won't tell you about.

   

A true story: An old friend of mine (and a very distant relative too) had a very good WC antique puller in the 3 MPH class. Year after year he was the points champ in the local club (about 6 events per summer) with 38 inch cut rubber. There were several very unhappy Deere pullers that tried every year at the rules meeting to have his big diameter tires banned because a WC didn't ever come with 38's. They did however come with 36's as an option. So, seeing the handwriting on the wall, he built a second identical WC, only with 28 inch cut Armstrong tires and I think they were 16.9 x 28's. At the end of the summer his 38 inch tractor was still the points champion. Second place in the points was his 28 inch tractor, still ahead of all the other competitors!!!  This somewhat proves two things: He KNEW what he was doing with either tractor better than his opponents. He also proved that in general, the 38's would still most of the time outperform the 28's if they were of pretty equal sq inch foot print.

I have a straight stick WD chassis without an engine available in southern MN.

trikesbikes@gmail.co wrote: Does anyone have or know where I can get the info saying that the WD 45 had an option for the 13.6 38 tire size was a factory option thanks 👍

I have a pair of 12 by 38 in rims 8 bolt centers, rims are new,250 a pair