Tyres question

[LeeD]

post 5

[AndrzejM]

Originally Posted by Saks

Last semester we have learned about tyres, and tyre dimensions. And in theory it says, lower tyre profile and wider = lower rolling resistance, higher tyre profile = higher rolling resistance.

Here is a picture of the difference betwen high profile, and low profile tyres


As you can see the the wider and low profile tyres have less surface contact (I don't know hot so speel it right because my English is still not that good, and I know that now sounds like the wider tyres are less safer than thyn tyres, but I hope somebody will get my point )

The contact patch is the same for every tire. With the same pressure of course.

I've found an explanation what was easier for me than writing it myself, because of my English skills ;-)

Anyway, you may want to take a look here: Tire question

[AndrzejM]

Originally Posted by LeeD

Cześć!
Andrej, independent of the width, I would buy the best rolling resistant tire you could afford. I am not sure what is available in Polska, but the research I have done tells me that Michelin Energy Saver A/S is the best you can buy. Because I am still new here, I can not post a link to the review that compared it's mpg to other tires, but it was significantly better than the others in the LRR tire category.

Cześć

unfortunately I was low on the budget and I bought Kleber tires. But thanks for the effort.

[LeeD]

Now I have enough posts.

Here's one review from the Tire Rack in the USA: Tire Test Results : When Round and Black Becomes Lean and Green

[AndrzejM]

I just found a polish test of All Season Tires (like my Klebers) and it turned out that Quadraxers have very low rolling resistance


The chart is based on measuring RR in kg per tone

Whole article here (in Polish): Na ka

[mcrews]

Originally Posted by Saks

Last semester we have learned about tyres, and tyre dimensions. And in theory it says, lower tyre profile and wider = lower rolling resistance, higher tyre profile = higher rolling resistance.

Here is a picture of the difference betwen high profile, and low profile tyres


As you can see the the wider and low profile tyres have less surface contact (I don't know hot so speel it right because my English is still not that good, and I know that now sounds like the wider tyres are less safer than thyn tyres, but I hope somebody will get my point )

Saks,
Sorry but I'm not believing that the skinny tire has that much foot print.
Think about it.
IT"S ROUND!!!! Round is still round.
To have that much difference in footprint it is either very very low on air or is square.

[Saks]

Well I'm just saying what I have learned in the last semester on my college. This picture is actuall material from the lecture I have listened, and the proffesor who taught us is not just only a normally professor, he has all the highest titles a man can get in engineering and is a specialist for motor vehicles and construction vehicles...so he must know some things

[CapriRacer]

OK, Time for additional information.

Contact patch size? Sorry, it is not the same at the same pressure. Wider tires have larger contact patches:

Fact or Fiction? Tire contact patch and air pressure.

It's a common myth. but you can NOT calculate the size of the footprint, if you know the pressure and the load. The physics involved is more complicated than that.

Also, rolling resistance is only slightly related to tire size - but in general, bigger is better.

But more important to rolling resistance is the tire itself. Not just brand, but make and model.

Here's some of what is going on:

Barry's Tire Tech

Briefly: There is a technology triangle involving treadwear, traction, and rolling resistance. In order to get improvements in one area, one (or more) of the other areas has to be sacrificed. It's all about the compromise. Careful selection of tires can yield the compromise that works for you.