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Discussion Starter #1
I don't quite understand why the LT needs such a high load rated tire. My Harley FLH weighed in at the same if not more than the lt, and it didn't need any special tire, yet the Lt needs this incredibly high rated very hard to get special tire. Are people over reacting?
 

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Old Slow Guy in A Fast Car
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No people are not over reacting, there have been plenty of people try a lighter load rated tire on the rear of the LT only to have problems.
Sidewall of tire rubbing on the swing arm because the sidewalls were not stiff enough and the bulged out is one major problem. This can cause early and catastrophic tire failure.
 

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Discussion Starter #3
I understand this, but what i don't understand is that the LT is no heavier than some of the other cruises such as the Harley FLH or the glowing, but these bikes don't require such a high rated tire.
 

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I understand this, but what i don't understand is that the LT is no heavier than some of the other cruises such as the Harley FLH or the glowing, but these bikes don't require such a high rated tire.
It' probably because BMW riders use the bikes to the maximum more so than HD riders. You know how well the fat girl handles. I think that that stresses the tires more than just weight.

Robert
 

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Wrencher Extraordinaire
2005 K1200LT
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If you could run a larger tire you could get away with a lower rating. You will find that this in not a very big tire (limited room on swing arm) compared to the big Harleys.
 

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Those HD tires are H rated also, not V rated like the LT tire. Higher speed rating stresses tires more. But I see that the Dunlop and Michelin rear tires for a late model FLH are load rating 81, higher than the 79 of the LT.
 
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Cat Herder
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The 81 can hold more weight than the 79 but the "V" is the important part for me. I can cruise at triple digits for long periods of time here in the great southwest.

This is a good read (Clicky)
 

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The 81 can hold more weight than the 79 but the "V" is the important part for me. I can cruise at triple digits for long periods of time here in the great southwest.

This is a good read (Clicky)

You can't get an LT to the V-rating speeds. Barely H riding downhill with gale force winds pushing you.

H would be fine.
A Harder tire compound would be better for longevity.
The Metzeler and Bridgestone tire choices are too soft for aggressive riding.
The V just disintegrate when you start leaning the bike left to right and back frequently.

OMG... Here comes the comments from the road racers getting 19K miles on LT tires... WTF. - You are not riding the bike!
 

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Discussion Starter #9
My sentiments exactly. I very rarely if any ride my LT faster than 90, and that's only when passing. I'm not a road racer, but i enjoy pushing the LT a little. Live in FL and not doing the tail of the dragon type riding. IOW just nice easy normal riding, therefore, it seems to me that a tire with the correct load rating but NOT the speed rating should be fine. And probably last longer.
 

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You can't get an LT to the V-rating speeds. Barely H riding downhill with gale force winds pushing you.

H would be fine.
A Harder tire compound would be better for longevity.
The Metzeler and Bridgestone tire choices are too soft for aggressive riding.
The V just disintegrate when you start leaning the bike left to right and back frequently.

OMG... Here comes the comments from the road racers getting 19K miles on LT tires... WTF. - You are not riding the bike!
Relax mate.
 

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Wrencher Extraordinaire
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Y

OMG... Here comes the comments from the road racers getting 19K miles on LT tires... WTF. - You are not riding the bike!
Mike not everyone wants to be a track monkey especially on public streets. Ride your own ride but don't blast someone who is riding their own ride. I never get more than 8K out of a rear because I have a lead wrist, but I don't drag hard parts (well not very often).
 
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I don't quite understand why the LT needs such a high load rated tire. My Harley FLH weighed in at the same if not more than the lt, and it didn't need any special tire, yet the Lt needs this incredibly high rated very hard to get special tire. Are people over reacting?
I am not a tire engineer, but I am an engineer and have read a little about motorcycle design (started with Gordon Jennings and included folks such as Tony Foale). Let me offer you a few things to consider.

Motorcycle components are designed for the bike's GVWR, not the empty weight. I am not sure the specs for the FLH, but few bikes match the LT's gross weight rating.

Speed is another factor. High speeds generate heat and the tire needs to be able to handle that. Speed ratings generally are more of a heat rating than a strength rating, although both matter at sustained high speeds.

Lastly, dynamics matter. Every structure distorts under stress and vibrates at a specific frequency based on mass and stiffness. I can pretty much guarantee that the LT's chassis and suspension are much stiffer than the Harley. This likely puts more stress on the tire as well and may well require a stiffer sidewall. Higher load rating likely gives more stiffness and the LT requires even more stiffness yet, hence the special REINF requirement.

Since there is no tire spec for stiffness, the engineers may well have used load range as a surrogate to get stiffer sidewalls, even though the GVWR alone may not have required the 79 rating. Engineers in all fields do this all the time.

Components like tires are complex systems needing to meet many requirements simultaneously and the specified attributes are interrelated in complex ways and can't be looked at independently. Novices think that only load affects load range and only speed affects speed rating, but a given tire is specified because it works as part of the total system. This includes things like dynamics that can't be specified directly.

Using a tire other than that specified by the bike maker means you are now a factory test rider which is fine as long as you accept that responsibility willingly and inform your passengers. You may never have a problem, then again, you may hit just the right bump at just the right speed to excite a resonant mode of the tire and suspension that triggers a fun tank slapper. "Are you feeling lucky?" to steal a Dirty Harry phrase..
 

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You can't get an LT to the V-rating speeds. Barely H riding downhill with gale force winds pushing you.

H would be fine.
A Harder tire compound would be better for longevity.
The Metzeler and Bridgestone tire choices are too soft for aggressive riding.
The V just disintegrate when you start leaning the bike left to right and back frequently.

OMG... Here comes the comments from the road racers getting 19K miles on LT tires... WTF. - You are not riding the bike!
What university issued your engineering degree?
 

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Relax mate.
Hang around long enough and you will learn that:

1. MikeE makes one juvenile post per month on average.
2. He is the best rider on the forum.
3. He is the foremost tire expert on the forum.
4. His riding style is the only "one right style" and every other riding style is decidedly inferior.

Did I miss anything, MikeE?

:histerica
 
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Discussion Starter #15
Voyager.. best explanation yet.. Thank you.. I never said i wasn't going to use the recommended tires. Of course i will. I was just wondering why as stated in my original post. Your explanation makes perfect sense. thanks again.
 

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Hang around long enough and you will learn that:

1. MikeE makes one juvenile post per month on average.
2. He is the best rider on the forum.
3. He is the foremost tire expert on the forum.
4. His riding style is the only "one right style" and every other riding style is decidedly inferior.

Did I miss anything, MikeE?

:histerica
Now Ward, you were pretty hard on the Beaver.>:)

Robert
 

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Hang around long enough and you will learn that:

1. MikeE makes one juvenile post per month on average.
2. He is the best rider on the forum.
3. He is the foremost tire expert on the forum.
4. His riding style is the only "one right style" and every other riding style is decidedly inferior.

Did I miss anything, MikeE?

:histerica

I wouldn't expect anything less out of a forum troll. It is sad you are so unhappy with your life. You should go outside more. The sunlight will do you some good.
With 46xx posts and usually a useless comment in every thread, I thought you know all?

Not the best rider and never said I was. I just use all of my bikes and and tires in world's best riding location.
Not to mention I change more motorcycle tires in a year than you have used in your entire life (including every car you have ever owned). I know a little about tires and how they perform on a bike.
 

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I wouldn't expect anything less out of a forum troll. It is sad you are so unhappy with your life. You should go outside more. The sunlight will do you some good.
With 46xx posts and usually a useless comment in every thread, I thought you know all?

Not the best rider and never said I was. I just use all of my bikes and and tires in world's best riding location.
Not to mention I change more motorcycle tires in a year than you have used in your entire life (including every car you have ever owned). I know a little about tires and how they perform on a bike.
Q.E.D.
 
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