Farm Equipment - D 21 ground speeds

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D 21 ground speeds

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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=117274
Printed Date: 08 Sep 2025 at 5:03pm
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Topic: D 21 ground speeds

Posted By: Allen Dilg
Subject: D 21 ground speeds
Date Posted: 08 Jan 2016 at 4:05pm

What is the ground speed with different tire sizes

Replies:

Posted By: Eldon (WA)
Date Posted: 08 Jan 2016 at 7:14pm

Listed in the operator's manual:
At 2200 rpm
18.4 x 34
1.5, 2.3, 3.3, 4.3, 5.7, 8.5, 12.2, 15.8
24.5 x 32
1.7, 2.5, 3.6, 4.6, 6.1, 9.1, 13.2, 17.0

These are for Series II, Series I speeds are slightly different.

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