Could use help with a rather odd issue

hermit · 06-13-2015, 05:14 PM

Quote:

Originally Posted by Spooler

You can always try something and if you don't like it, go a different route the next set of tires.

Exactly what I was thinking.

Spooler · 06-13-2015, 05:22 PM

I have got 265/35/19 Front and 285/35/19 Rear now. I am stepping up in size next set. My rears are just about done. I have over 20,000 miles on them and about 5,000 more to go before I see cord. LOL, I don't get new tires until I get ALL the goody out of them.

kenchan · 06-13-2015, 07:00 PM

Spooler · 06-13-2015, 08:20 PM

Quote:

Originally Posted by kenchan

Yeah man, I have driven farther in less than a year in my Z than you have the whole time you have owned yours...

hermit · 06-13-2015, 08:24 PM

Quote:

Originally Posted by Spooler

Yeah man, I have driven farther in less than a year in my Z than you have the whole time you have owned yours...

I put on about 3k miles since I've owned mine. So, you got me beat by a long shot there.

Spooler · 06-13-2015, 08:26 PM

Quote:

Originally Posted by hermit

I put on about 3k miles since I've owned mine. So, you got me beat by a long shot there.

Yeap, it is my DD and it is 52 miles to work one way. It puts a smile on my face every time I go to work. Makes the drive bearable.

hermit · 06-13-2015, 08:28 PM

Quote:

Originally Posted by Spooler

Yeap, it is my DD and it is 52 miles to work one way. It puts a smile on my face every time I go to work. Makes the drive bearable.

Have to agree with that.

Red__Zed · 07-06-2015, 06:59 PM

Quote:

Originally Posted by MacCool

Physics is physics. These friction concepts have been known since the time of Coulomb (18th century). You can prove the concept mathematically yourself using the formula I included above. Ffind the variable that represents contact area. (you can't....it doesn't exist)

Contact area has nothing to do with friction, and increasing contact area won't increase your traction. Now, if you're going to track the car, then you'll want wider tires for the same reason race cars use wider tires...to keep them from getting greasy when you really push them on the track. I'd be pretty surprised if more than a few people here on this forum had the skill to push their Z, even an FI Z, that hard on the track where the difference between 325's and 275's would affect your ability to run the car.

Coulomb's model hasn't been considered an accurate representation for pneumatic tires since...well...ever. His model works well for "hard" solids, not so much for sticky, deformative surfaces.

Contact area definitely does matter for systems like a tire on pavement. We've already establish that pretty clearly in the other threads where this has come up - both adhesive and deflective components rely on surface area.

https://en.wikipedia.org/wiki/Fricti..._Coulomb_model

06-13-2015, 05:22 PM	#47 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,525 Drives: 2013 Nismo 370z Rep Power: 2684391	I have got 265/35/19 Front and 285/35/19 Rear now. I am stepping up in size next set. My rears are just about done. I have over 20,000 miles on them and about 5,000 more to go before I see cord. LOL, I don't get new tires until I get ALL the goody out of them. hermit likes this.

06-13-2015, 07:00 PM	#48 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	hermit likes this.

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