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  #21  
Old 5th February 2020
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Quote:
Originally Posted by Will1250 View Post
On a general note: does everyone know and use the four psi rule for setting tyre pressures?

Cheers, Will
I've never heard of it but Duck Duck Go has ....

https://www.tyrereview.com.au/tyre-advice/the-4psi-rule

The only problem I see is if you're checking a 21" MH90 tire/tyre it has a very low volume of air compared to a car tire/tyre this is based on.
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  #22  
Old 5th February 2020
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Originally Posted by NLXL View Post
MC tyres have stronger side walls to prevent less sideway movement. They use softer rubber for rainy conditons and have a different carcass to accommodate comfort for a two wheeler. Car tyres seem to have a harder type of rubber, which can have less grip in rain on a motorcycle. Let's not forget that a car uses all 4 tyres to let it stop and handle rain. The heavier weight of a car presses more on the tyre which probably compensate the harder rubber.

And like you said, economics make them more expensive. In comparison to the car tyre industry there is less demand for motorcycle tyres. Less demand = higher prices

But it all depends on the environment if you want to use a car tyre. I won't, because I live in a country with rain, cold weather, cobble stone and often slippery bitumen. But I sure would try it if I lived in a hot, dessert like country with bad or no roads.
I believe almost everything you stated here is incorrect.
To start with, there are all kinds of automotive tires and all kinds of motorcycle tires. The grooving, pattern and sipes are what make a tire bad, good or great in a given environment like rain and wet pavement and depending on a tire to tire comparison, the sidewalls may or may not be stiffer on one or the other.

Even in your video he states (or at least infers) auto tires might be better on the bigger bikes like a Goldwing. There is a video on Youtube of a Goldwing with a car tire going through the Dragon I think, though it was supposed to discourage using auto tires, most in the comments agreed it supported the use of auto tires on a large bike.

I have never seen a scientific comparison on the differences in handling and just like mentioned by ParrotHead, no one can find where the use of a car tire has caused any issues.

You can buy and install the wrong motorcycle tire for your motorcycle as well, I would run a car tire if the only motorcycle tire didn't have the proper ratings, there are IIRC some bikes out there like that. I've seen where some (particularly some older motorcycles) are running a front motorcycle tire on the rear due to sizes and availability.

Probably the biggest thing against auto tires on a motorcycle (I don't think I have seen this mentioned anywhere in these debates) is the fronts and rears are usually designed to work together, particularly in wet/rainy conditions.

In the end, I don't waist any of my time worrying about what other people do.

I do wish more sizes in radials were available for motorcycles.
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  #23  
Old 5th February 2020
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The 4 PSI rule is okay I guess, there are better ways. I sometimes do the reverse when travelling, with a warm tire I set the pressure 3 or 5 PSI over what I would run on the cold tire, that's why many have under inflated tires since they check them at the gas station when they are warm and inflate to the Manufacturer Specifications which is for a cold tire (ambient outdoor air temp, not garage temps).

From a Honda Manual

Quote:
Measure the air pressure when tires are cold. This means the vehicle has been parked for at least three hours, or driven less than 1 mile (1.6 km). If necessary, add or release air until the specified pressure is reached. If checked when hot, tire pressure can be as much as 4–6 psi (30–40 kPa, 0.3–0.4 kgf/cm2) higher than if checked when cold.
P.S. It is better to err on the side of slightly higher than slightly lower, many more safety issues for an underinflated motorcycle tire.

]Which goes back to the OP, what would be a good starting point for inflation pressures for an automobile tire on a motorcycle, maybe some dark siders can weigh in on that?
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  #24  
Old 5th February 2020
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Quote:
Originally Posted by SLW210 View Post
I believe almost everything you stated here is incorrect.
To start with, there are all kinds of automotive tires and all kinds of motorcycle tires. The grooving, pattern and sipes are what make a tire bad, good or great in a given environment like rain and wet pavement and depending on a tire to tire comparison, the sidewalls may or may not be stiffer on one or the other.

Even in your video he states (or at least infers) auto tires might be better on the bigger bikes like a Goldwing. There is a video on Youtube of a Goldwing with a car tire going through the Dragon I think, though it was supposed to discourage using auto tires, most in the comments agreed it supported the use of auto tires on a large bike.

I have never seen a scientific comparison on the differences in handling and just like mentioned by ParrotHead, no one can find where the use of a car tire has caused any issues.

You can buy and install the wrong motorcycle tire for your motorcycle as well, I would run a car tire if the only motorcycle tire didn't have the proper ratings, there are IIRC some bikes out there like that. I've seen where some (particularly some older motorcycles) are running a front motorcycle tire on the rear due to sizes and availability.

Probably the biggest thing against auto tires on a motorcycle (I don't think I have seen this mentioned anywhere in these debates) is the fronts and rears are usually designed to work together, particularly in wet/rainy conditions.

In the end, I don't waist any of my time worrying about what other people do.

I do wish more sizes in radials were available for motorcycles.
I replied to Kbetts question.

Yes, there are different types of tires, that's obvious...I didn't mention anything about. I was talking in general about a car tire.
Where did I say something about automotive tires on large bikes in my answer?
Where was I talking about differences in handling in my answer?
Where was I talking about front and rear in my answer?

Again, what I wrote was a reply to Kbetts question, but you seem to have missed that. In your reply to me you seem to have a wealth of knowledge about tires. Therefore I think that you are the designated person to answer the question he asked:

Why do car tires last so long on a motorcycle compared to a purpose built tire?
http://xlforum.net/forums/showpost.p...9&postcount=18

Parrothead was right...
"When it comes up as a topic it almost rivals an oil thread."

Last edited by NLXL; 5th February 2020 at 19:57..
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  #25  
Old 5th February 2020
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All season car tire have thread depth of around 14/32, motorcycle have thread depth of about 8/32.

Now you have your answer.

Knobby tire wear fast because less surface.

Slick tire wear slower because more surface.

Most bike tire has more surface than sipe for comfort like the car economy tire that save gas.

I've run more than 5000 kilometer on a trip up north (James Bay). I had a rear car tire; no problem and all the ones who run car tire neither. All the rest on motorcycle tire had flat. So 8 on car tire with no problem and 18 on bike tire all with flats most on the rear wheels.

The ones on bike tire were also slowing the ones on car tire???

Most front tire last about twice as long as the rear and have less thread depth!
I did install a new commander II before the ride in the front.
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  #26  
Old 5th February 2020
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It's been my experience that all season tires run 11/32. The tire wear is almost exclusively due to the compound. High silica/high density compounds give 70,000 mile tread warranty with 11/32" original depth.

I get roughly 8,000 miles on my 80/20 semi-knobby tires pn my Vstrom with way more than 15/32". More like 3/4" tread depth or more.

Michelin claims their Commander 2 will go "UP TO" 30,000 km. I can't find anything advertised with a longer tread life.

As far as grip goes, my General Altimax R43 70,000 mile tires I put on my wife's car have a lot of grip in corners and even in snow. That technology has to translate to all tires including motorcycle tires. I think they just don't want to make them.
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  #27  
Old 6th February 2020
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Quote:
Originally Posted by NLXL View Post
I replied to Kbetts question.

Yes, there are different types of tires, that's obvious...I didn't mention anything about. I was talking in general about a car tire.
Where did I say something about automotive tires on large bikes in my answer?
Where was I talking about differences in handling in my answer?
Where was I talking about front and rear in my answer?

Again, what I wrote was a reply to Kbetts question, but you seem to have missed that. In your reply to me you seem to have a wealth of knowledge about tires. Therefore I think that you are the designated person to answer the question he asked:

Why do car tires last so long on a motorcycle compared to a purpose built tire?
http://xlforum.net/forums/showpost.p...9&postcount=18

Parrothead was right...
"When it comes up as a topic it almost rivals an oil thread."
I saw no quote. Nor did anything you post seem overly related to a single response than to the topic in general.

YOU posted the video and made false claims and (by your own admittance) generalizations and suppositions. Back them with FACTS. You can't, that's why all of these threads end up in mostly opinionated (interesting the dark side speaks from real world experience (FACTS?)) debates, based at best on suppositions, by people that have never done it, like you.

The FACT is, until you do an actual controlled test, you don't really know. Though the FACT that there are no reports of dire catastrophe from car tires on motorcycles, that no problems exist in the real world anyway is the obvious intelligent conclusion. The best we have is a lot of people running car tires and their experiences, most if not all seem to be positive. If it was as dire as you say, Insurance Companies would be refusing motorcycles that run car tires, they don't as far as I know here in the still great USA.

Don't start none, there won't be none!
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  #28  
Old 6th February 2020
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Quote:
Originally Posted by NLXL View Post
...But it all depends on the environment if you want to use a car tyre...
And what you're putting one on. Remember the VN2000 Kawasaki's? Running motorcycle rear tires would put you on the tire manufacturers' Christmas card list. They lasted maybe 2,500 miles. In general I've never liked car tires on bikes but that was a bike I would have run a car tire on...
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  #29  
Old 6th February 2020
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Quote:
Originally Posted by SLW210 View Post
I saw no quote. Nor did anything you post seem overly related to a single response than to the topic in general.

YOU posted the video and made false claims and (by your own admittance) generalizations and suppositions. Back them with FACTS. You can't, that's why all of these threads end up in mostly opinionated (interesting the dark side speaks from real world experience (FACTS?)) debates, based at best on suppositions, by people that have never done it, like you.

The FACT is, until you do an actual controlled test, you don't really know. Though the FACT that there are no reports of dire catastrophe from car tires on motorcycles, that no problems exist in the real world anyway is the obvious intelligent conclusion. The best we have is a lot of people running car tires and their experiences, most if not all seem to be positive. If it was as dire as you say, Insurance Companies would be refusing motorcycles that run car tires, they don't as far as I know here in the still great USA.

Don't start none, there won't be none!
I did post a video, but that doesn't mean I agree with everthing that is said or claimed in it. I posted this as what I find is remarkable information. If you want to prevent people sending in video's in this forum, please contact the owner/admin of this forum. I will gladly comply to this prohibition....and then leave...

For the second time: It would be nice if you just anwered the questions in my previous post instead of going on ranting about things I did not say. So, once again, where did I write the things you accuse me of? I'm afraid you can't and that you are just following your own assumptions. If you accuse me of things it shouldn't be hard for you to copy and paste 'the false claims' I made when I posted the video and that I even 'admitted' it? To make it easy for you: You may place them here ---->

Last edited by NLXL; 6th February 2020 at 17:20..
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