Farm Equipment - top speed

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top speed

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=173498
Printed Date: 09 Sep 2025 at 10:05am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: top speed

Posted By: Marlyn nwia
Subject: top speed
Date Posted: 12 Aug 2020 at 5:28pm

I am going on a tractor ride. Will I be able to keep up with red and green? What is the

theoretical top speed of my D-12 III with over/under and 14.9/24 rear tires?

Replies:

Posted By: TomC
Date Posted: 12 Aug 2020 at 5:37pm

I don't know if this helps or not, but on my CA with 12.4 X 24 in 4th gear using my GPS in pedestrian mode it shows 16 mph. Could be comparing apples to oranges but it may help you.And I'm not sure of the accuracy of a GPS on pedestrian mode,, I do know it is as fast as I want to go on it.

Posted By: DrAllis
Date Posted: 12 Aug 2020 at 6:07pm

You're looking at 15.0 MPH @ 2,000 RPM with a 12.4 x 24 rear tire. No, you cannot keep up to a legit M or Super M Farmall. If you increase your engine speed to 2,200 RPM, then road gear is 16.5 MPH. Now you can keep up with some M's.

Posted By: jiminnd
Date Posted: 12 Aug 2020 at 7:07pm

All rides I have been on they have a speed limit, anything from 10 to 15 mph, I think it is not a race, its for enjoying the ride.

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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)

Posted By: DrAllis
Date Posted: 12 Aug 2020 at 7:32pm

I go on several each Summer and 14 MPH seems to suit me the best. Don't have to run full throttle, but fast enough to cover some miles. The 10 MPH thing is sooo bad, I won't go on one anymore.

Posted By: Dusty MI
Date Posted: 13 Aug 2020 at 8:53pm

I have a D-10 series III with the Hi/Lo gear box in front of the standard 4 speed transmission. I drive it on tractor drives/caravans, It will 16-1/4 mph.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: DrAllis
Date Posted: 13 Aug 2020 at 8:57pm

The HI/LOW gearbox does nothing for the top speed, as it is direct drive when in HI. A regular 4 speed has the same top speed. Rear tire diameter and maximum engine RPM dictate how fast it will go.

Posted By: Dusty MI
Date Posted: 14 Aug 2020 at 8:38am

Thanks Doc. I just learned something. I had always figured that the Range Transmission ( two speed gear box was a straight/over gear box.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: JoeO(CMO)
Date Posted: 14 Aug 2020 at 1:39pm

I've had my D10III w/ range in one ride-my last ride!

If I get talked into one again the tractor will be on the trailer and ride in the cab.

The variations in tractor speeds over the years for the different models won't allow uniform speed.

highly unlikely you'll ever go top speed unless you stop at a roadside park, take a nap and want to catchup.

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Posted By: Bill_MN
Date Posted: 14 Aug 2020 at 5:28pm

I know the guy who leads the two local rides I go on, he has some Allis and knows how slow they can be so he usually puts me near the front to set the pace. Any smart tractor ride will either split into groups or put the slow tractors up front and just go their speed.

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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow