Garrettohio
New User
What standard size tire is same size as these? Tires use to be sized in like 11.2 and 13.6 and sizes like that.how I convert a 420/70/24 size into the other sizes to get same width and height?
- Thread starter Garrettohio
- Start date
DoubleO7
Well-known Member
- Location
- Crystal River, FL
16.5x24, 70 is aspect ratio for the side wall or 70% of 16.5 or 11.5 inches from rim to top of tire. So the 420/70/24 would be 16.5x47 tall on 24 rim.
Probably an R4 tire?
The first number is millimeters so multiply mm x .03937. = inches.
There are more charts here:
https://www.yournexttire.com/tractor-tire-conversion-chart/
This post was edited by DoubleO7 on 09/24/2023 at 07:16 am.
Garrettohio
New User
So mine would be 16.9-24.whats the middle
number? Mine is 70 and that's 85.is it
the width?
number? Mine is 70 and that's 85.is it
the width?
DoubleO7
Well-known Member
- Location
- Crystal River, FL
Aspect ratios are delivered in percentages. Tire makers calculate the aspect ratio by dividing a tire's height off the rim by its width. If a tire has an aspect ratio of 70, it means the tire's height is 70% of its width.
Bob Bancroft
Well-known Member
- Location
- Aurora NY
I believe that number is called the aspect ratio. It's the ratio of the width to the height, or vice versa, I don't remember. You may not be able to match it up exactly. A little internet snooping around will probably give you more than you want to know!
Since there isn't a direct replacement in ''standard'' tire sizes because a 70 series is considered a low profile tire, you would have to go with the 14.9 and have a tire that is the same height as original but a little narrower, or 16.9 for the same width but be a little taller than original, although I don't see a 16.9-24 listed in this chart.
caterpillar guy
Well-known Member
The new tires sizes once again don't totally mach the olde sizes like the ones were different before. The 420 would be about a 16.9 width then just fit the rim diameter and forget about the concern of the middle number. They will vary some though not much to worry about.
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
The short answer is 420/70R24 is the same size.
They are phasing out the "old" sizing in favor of the "P-metric" style sizing that's currently used on car and pickup truck tires.
10 years from now people will be asking what the equivalent to a 16.9x24 is. There won't be any 16.9x24.
First number is the width in millimeters.
Second number is the "aspect ratio" the percentage of the width that is the sidewall height.
Third number is the rim diameter in inches.
420/70R24 is roughly 420mm wide, 70% aspect ratio (meaning the sidewall is roughly 294mm high, on a 24" diameter rim.
Most American tractors use 85% aspect ratio tires. 70% aspect ratio indicates that it is a European tire size as they tend to use wider tires with lower aspect ratios instead of duals.
If this is a front tire on a 4WD tractor you need to stick with the original size. If you go to 420/85R24, the tire will be too tall which will mess up your lead/lag and cause problems like driveline binding and/or power hop.
They are phasing out the "old" sizing in favor of the "P-metric" style sizing that's currently used on car and pickup truck tires.
10 years from now people will be asking what the equivalent to a 16.9x24 is. There won't be any 16.9x24.
First number is the width in millimeters.
Second number is the "aspect ratio" the percentage of the width that is the sidewall height.
Third number is the rim diameter in inches.
420/70R24 is roughly 420mm wide, 70% aspect ratio (meaning the sidewall is roughly 294mm high, on a 24" diameter rim.
Most American tractors use 85% aspect ratio tires. 70% aspect ratio indicates that it is a European tire size as they tend to use wider tires with lower aspect ratios instead of duals.
If this is a front tire on a 4WD tractor you need to stick with the original size. If you go to 420/85R24, the tire will be too tall which will mess up your lead/lag and cause problems like driveline binding and/or power hop.
Similar threads
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy