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11-18-2009, 10:27
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#1 (permalink)
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4 Star General
Join Date: Jun 2004
Location: Oklahoma City
Posts: 3,426
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Tire Size Comparison 16 vs 14 vs 15.5
I get a lot of questions regarding tire sizes. Here is a comparison pic to show the difference between 16R20, 14R20, 15.50/80R20, all in the Michelin XL tread pattern. They measure about 52", 49" and 46", respectively. Any of these sizes will work as super singles on a 5 ton, with only the 15.5 tires being suitable for 6x6 deuce.
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The Following 7 Users Say Thank You to M1075 For This Useful Post:
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11-18-2009, 10:42
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#2 (permalink)
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Sergeant Major
Join Date: Nov 2009
Location: San Jose, Ca
Posts: 129
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Its nice to get a real world view of the tires side by side.
Thanks!
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11-18-2009, 10:50
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#3 (permalink)
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4 Star General
Join Date: Jun 2004
Location: Oklahoma City
Posts: 3,426
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Quote:
Originally Posted by skark_burmer
Its nice to get a real world view of the tires side by side.
Thanks!
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No problem! I have explained it to customers many times. Most have a hard time grasping the fact that 15.5 is smaller than 14.00. Next time, I need to throw in a "tiny" 11R20 for real comparison!
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11-18-2009, 11:08
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#4 (permalink)
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Moderator
Join Date: Jan 2005
Location: Meadows of Dan, Virginia
Posts: 9,929
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The aspect ratio should always be taken into consideration. Like the "/80", which means that the tire is only 80% of the width in height.
The 15.5/80R20 should be 44.8 inches tall going by the numbers, while the 100% aspect ratio 14R20 should be 48.0 inches tall on a 20 inch wheel. Real world measurements will be different, no doubt, depending on tire pressure, wear and tread pattern.
The tires on my 8x8 are actually 16/70-20, which makes them only 42.5 inches tall while they are 16 inches wide (image below compared to 1100-20 NDCC).
__________________
Bjorn
MEP-018A (needs new generator head)
Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake and more. (SOLD)
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".
"Some things can't be made better, just differently......a lot of things actually"
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The Following 2 Users Say Thank You to cranetruck For This Useful Post:
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11-18-2009, 12:13
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#5 (permalink)
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Command Sargent Major
Join Date: Sep 2009
Location: Hattiesburg, Mississippi
Posts: 458
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more please 
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Jeff Davis
CSM 3rd Bde Mississippi State Guard
Hattiesburg, Mississippi
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M1028
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11-18-2009, 12:41
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#6 (permalink)
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4 Star General
Join Date: Oct 2006
Location: Huntington, NY
Posts: 1,257
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Hi,
Thank you for taking the time to take measurements & post pics.
Two questions:
1.) Are the 15.5" 80R20s still in production, if not then on a scale of 1-5 (five being the most difficult) how hard are they to source?
2.) I'm wondering out loud if the above tire can be run as duals in the back for a 5ton application?
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11-18-2009, 13:22
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#7 (permalink)
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4 Star General
Join Date: Jun 2008
Location: CT W. R.
Posts: 1,507
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Pic previously posted by someone.
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11-18-2009, 14:04
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#8 (permalink)
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4 Star General
Join Date: Jun 2004
Location: Oklahoma City
Posts: 3,426
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Quote:
Originally Posted by 11Echo
Pic previously posted by someone.
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Yeah that someone was me. 
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11-18-2009, 14:10
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#9 (permalink)
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4 Star General
Join Date: Jun 2004
Location: Oklahoma City
Posts: 3,426
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Quote:
Originally Posted by No.2Diesel
Hi,
Thank you for taking the time to take measurements & post pics.
Two questions:
1.) Are the 15.5" 80R20s still in production, if not then on a scale of 1-5 (five being the most difficult) how hard are they to source?
2.) I'm wondering out loud if the above tire can be run as duals in the back for a 5ton application?
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1) Easy to source. They are used on M1076 PLS trailer and are heavier ply (1  than 395/85r20 tires. I usually have some.
2) You should be able to run these as duals on a bridge truck. There would not be enough clearance on a regular 5 ton.
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11-18-2009, 14:15
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#10 (permalink)
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4 Star General
Join Date: Jun 2004
Location: Oklahoma City
Posts: 3,426
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Quote:
Originally Posted by cranetruck
The aspect ratio should always be taken into consideration. Like the "/80", which means that the tire is only 80% of the width in height.
The 15.5/80R20 should be 44.8 inches tall going by the numbers, while the 100% aspect ratio 14R20 should be 48.0 inches tall on a 20 inch wheel. Real world measurements will be different, no doubt, depending on tire pressure, wear and tread pattern.
The tires on my 8x8 are actually 16/70-20, which makes them only 42.5 inches tall while they are 16 inches wide (image below compared to 1100-20 NDCC).
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Thanks Bjorn. What is strange is that 15.5/80r20 is the same size as 395/85r20. It is weird that they have different aspect ratios.
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