Tyre/mag size, DC2r

[freakygeek]

i really cant imagine why this would be the case?

i will definately go 195/55 for the next set for the stockies though..

Well, when you think about it, it's not that hard to see why.

You car is putting the same amount of pressure onto the road, so if you increase one dimension of the contact area, then the other will be decreased so the actual contact area will be the same (tyre pressures and other variables remaining equal). Just the contact area will be a different *shape*.

Edit: This calls for a tinkerbell style MSpaint picture!!!!

[tinkerbell]

i really cant imagine why this would be the case?

imagination requires effort,

but in this case, google can help:

http://www.toyojapan.com/tires/pdf/TTT_08.pdf

http://www.tirerack.com/tires/tirete....jsp?techid=10

as can pictures:

[tinkerbell]

how do you keep your lines so straight freakygeek?!???

[Jingers]

its called the line tool

[freakygeek]

how do you keep your lines so straight freakygeek?!???

hahahaha you're just jealous of my uber MSPaint.exe skillzz0rz!

PS. I used the rectangle tool

[-Ad-]

applying simply physics might simplify things perhaps.
using: Force = Mass X Area.

in our case, force is the cars mass X gravity. this is a static number as it doesnt change much at all.

so to keep force constant, mass and area have an inverse relationship.
if increasing the tyre width, there is less mass to be exerted per area squared, therefore, a narrower contact patch. if u wanted to increase contact patch by going wider and maintaining the longitudinal aspect, then greater mass would be required.

[VTECMACHINE]

I run 205/45/16 on my 16x7. I got 205/50/16 on my spare 16x6. I prefer the 205/45/16 though.

Thanks so much dude! Just needed the 45 part. Does it change the rolling diameter?

[tinkerbell]

http://www.1010tires.com/TireSizeCalculator.asp

work it out yourself... we are all here to learn

[JCE]

I believe JCE experienced this same phenomenon with his CRX, going from 195 on the OEM wheels back to the standard 185, and making the cars response feel much sharper.

When I had the OEM wheels on the CRX, 195 felt like shit (it is too late for me to elaborate, so I'll leave it a that). Going to 185 was a vast improvement.

My ITR is the same as well, it currently has 205/50/15 Kuhmo v700's on the stock rims. While the grip of the tyres is superb, the feel is not.
The car is constantly railroading/tracking on irregularities in the roads surface and it feels as though you are constantly fighting the tyres.

While this may be acceptable on the track, i find it annoying on the street.
Both freakygeek and myself run much higher tyre pressure than normal, so the disadvantages of a wider tyre would only be excaerbated if you followed the manufacturers recommedations on tyre pressure.

Freakygeek's ITR with re010's (195/55/15) on stock wheels is a world of difference.

[00dc2]

imagination requires effort,

but in this case, google can help:

http://www.toyojapan.com/tires/pdf/TTT_08.pdf

http://www.tirerack.com/tires/tirete....jsp?techid=10

as can pictures:

ive read the stuff on those links and it says that contact patches with sharper corner give better cornering traction and grip and less straight line stability while more rounded contact patches give better straight line traction..

it also says that when the patch becomes extreme like a butterfly then it gives even more cornering grip.

sounds good to me

so the lower the profile the sharper the patch corners.. also the design of the shoulder of the tyre can effect this too..

i think the "feel" being crap with 205's might be more related to sidewall balooning/flex than the patch?

this needs more thought..

[JCE]

I run around 36-38 psi in my tyres.

There is minimal sidewall flex at all.

Track down a set of 195/55/15 re010 and feel the difference, you will not want to drive on another set of street tyres again on OEM wheels.

[00dc2]

where can i get them from?

[JCE]

I have just bought the last few from the Bridgestone Sydney warehouse.

They are extremely hard to track down.

[TAFKA TMB]

I wondered who would buy them. I bought a set in Aug/Sept and they said that there were only 8 or 13 tyres left in the country then.

[VTECMACHINE]

http://www.1010tires.com/TireSizeCalculator.asp

work it out yourself... we are all here to learn

awww tink's you are awsome brother! Thanks... comes veryy handy