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Author Topic: tire width static vs dynamic  (Read 1490 times)

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ltank

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tire width static vs dynamic
« on: October 30, 2012, 02:00:49 PM »
Hi
 I contacted Michelin about their Commander 2 high mileage tires. I asked about the tire widths. I was given
The specs and the tire width actually increased while in use. I expected just the opposite! Has anyone heard of this before. I was wanting to use a wider tire that would be close but under use it would be too wide!
Tire width increased 1/2" inch!!!???
Thanks
Ltank
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grc

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Re: tire width static vs dynamic
« Reply #1 on: October 30, 2012, 02:44:05 PM »
Quote from: ltank on October 30, 2012, 02:00:49 PM
Hi
 I contacted Michelin about their Commander 2 high mileage tires. I asked about the tire widths. I was given
The specs and the tire width actually increased while in use. I expected just the opposite! Has anyone heard of this before. I was wanting to use a wider tire that would be close but under use it would be too wide!
Tire width increased 1/2" inch!!!???
Thanks
Ltank

Ask them where that increase in width is actually measured, all around the circumference or only where the tire is contacting the road?  I'll bet it's the latter.  They are the only ones I've seen with two difference widths and circumferences listed in their spec sheets, and while the circumference difference is easily explained especially at higher speeds, the width difference needs more explanation.

Jerry
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ltank

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Re: tire width static vs dynamic
« Reply #2 on: October 30, 2012, 06:09:39 PM »
This was my 1st email question.
" What is the actual widest measurement on your Camander 2 Motorcycle tire 140/90 B16 77H (repl. MU85 B16)
and the 150/80 B16 77H"
the reply was
"140/90B16 = 6.14 inches (156 mm)"
"150/80B16 = 6.50 inches (165 mm)"
"We appreciate your business and thank you for choosing Michelin."
 
2nd email to them "Why are the tires so much wider than the numbers specified on the tire size?
How about the 130mm 16" tire?"
"The sizes given were in-use (deflection under load) measurements."
"The Commander II in size 130/90B16 measurements are as follows:"
"Static width = 129 mm (5.08 inches")
"In-use width = 142 mm (5.59 inches)"
"We appreciate your business and thank you for choosing Michelin."

Strange ?
Thanks,
Ltank









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grc

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Re: tire width static vs dynamic
« Reply #3 on: October 30, 2012, 07:48:13 PM »
Quote from: ltank on October 30, 2012, 06:09:39 PM
This was my 1st email question.
" What is the actual widest measurement on your Camander 2 Motorcycle tire 140/90 B16 77H (repl. MU85 B16)
and the 150/80 B16 77H"
the reply was
"140/90B16 = 6.14 inches (156 mm)"
"150/80B16 = 6.50 inches (165 mm)"
"We appreciate your business and thank you for choosing Michelin."
 
2nd email to them "Why are the tires so much wider than the numbers specified on the tire size?
How about the 130mm 16" tire?"
"The sizes given were in-use (deflection under load) measurements."
"The Commander II in size 130/90B16 measurements are as follows:"
"Static width = 129 mm (5.08 inches")
"In-use width = 142 mm (5.59 inches)"
"We appreciate your business and thank you for choosing Michelin."

Strange ?
Thanks,
Ltank

It's as I suspected, deflection under load means the tire cross section becomes shorter and wider "where the rubber meets the road" so to speak.  At the points where you would be concerned with clearance to the swingarm, belt, fender, etc., this should not be a factor.  I'd just use the static width from the spec sheet for your clearance calculations.

Jerry
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ltank

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    • CVO2: 1983 88" Shovelhead Won the World of Wheels 1985 Sept 85 Issue of Hot Bike Mag
    • CVO3: 1989 FXRS, 1990 Custom 100" Shovelhead/ EVO
Re: tire width static vs dynamic
« Reply #4 on: November 08, 2012, 02:21:23 AM »
I showed the Michelin tire chart to my local bike shop and they had difficulty believing that the tire width
Increased that much. They knew they get taller but not wider. I tried contacting Dunlop and Avon about their tires but they have not replied. They don't advertise this info.
Thanks
Ltank
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