sliding

[darkon]

my old tires were 205/65r15s on a 6 inch rim
my new ones are 225/55r16s on an 8 inch rim
the arse kicks out WAY easier on my new 225s which doesnt make sense to me? is this a sideeffect of having a much stiffer side wall or are the rear tires really worth the next to nothing that I paid for them. I know wit suspension it's usually stiffness vs grip so any light anyone wants to shed would be great

[Hen is a total nutcase]

IMO tyres are the single thing with the biggest impact on handling of a car. If you bought shitty tyres, they wont grip, and you will slide.

Get some good ones, or if they're going to be drifter (ON TRACK) then find some decent second hand ones.

Hen

[drft86]

it's actually probably due to a lower profile and tighter fitting tyre, hence there is less tyre squirm.

Drag cars, big, higher profile tyres for grip

but yeah, shit tyres would also do the trick

[mikewestphoto]

The profile of the 205/65 is 133mm and 123mm for the 225/55 so not much difference there but I think the stretch will make a difference enough to notice.

When tires slide, the grip of the tire is mostly dependant on compound so I'm guessing you bought the worst tires money could buy for you.

[ke70dave]

one idea I just had, was that you now have a much wider tyre so therefore the pressure on the ground is lower

pressure = force/area

force = weight of car

area = tyre width.

I was reading somewhere, that there becomes a point where a larger tyre surface are, can actually be detrimental to grip because, like above, the actual pressure on the ground drops.

obviously this is a very crude analysis, and there are a lot more factors involved with "grip", but it was just an idea I had.

my bet would just be you have crap tyres, if they are 2nd hand, maybe they been sitting somewhere for ages and have gone hard and buggered.

[roadsailing]

blah blah blah[/b]

cheap shit tyres don't grip, if they did then the universe would be all topsy turvey

no offence ke70dave :P

[rthy]

yeah I use to buy cheap pov pack 185/60/r14 rwc $10 tyres for my 1st ae86 and wondered y I spin out all the time...
now using goodyear grid 195/50/r15 tyres that stick in the wet :D

[ke70dave]

where did you get that quote from? it's not in my reply there???? :blink:

I know cheap tyres don't grip, if they did, like you said, the world would be silly

edit: yeah I get what you've done, very cunning and smart, yeah ill agree it was a bit bla bla bla-ish lol

[darkon]

one idea I just had, was that you now have a much wider tyre so therefore the pressure on the ground is lower

pressure = force/area

force = weight of car

area = tyre width.

I was reading somewhere, that there becomes a point where a larger tyre surface are, can actually be detrimental to grip because, like above, the actual pressure on the ground drops.

obviously this is a very crude analysis, and there are a lot more factors involved with "grip", but it was just an idea I had.

my bet would just be you have crap tyres, if they are 2nd hand, maybe they been sitting somewhere for ages and have gone hard and buggered.[/b]

I was actually thinking that myself. also I was thinking less pressure on the tire could mean improved tread wear. is it just me or have we solved the age old question of "if drifting's about sliding why do d1 drivers have rediculously large tires on the rear but small ones on the front" lol

and yes I'm pretty sure they'v been sitting around getting old and buggered.. I mean the tread has cracks in it lol if you see me round il probably be taking advantage of my crappy tires and rippin skids :P

[Hen is a total nutcase]

Don't put much faith in the "derivation" above. Tyre grip and wear depend on a huge number of factors that aren't particularly well understood (Google "pacjeka magic tyre model" and have a read).

You have shit tyres. They will slide.

The stiffer, smaller sidewall should help the situation. However refer to the above again.

Hen

[driftke70]

there are many variables, pressures, rolling diameters, side wall thickness, profile, how old and shitty the tyres are, compounds, offset plays a fairly big role.

Check the build date on the tyres, there should be like a little capsule shaped indent with some numbers, if it says something like 339, that means it was made in the 33rd week of 99. If it says 3306 then thats the 33rd week of 06.

Hope they arnt those blue streaks, I had them on my old Fairmont once, I could not stop aqua planing on anything wetter than a patch of spit.

[darkon]

yeah the tires on my old rear stockos were blue streaks on a rainy day id be sittin at the lights for a solid 30 seconds spinnin em on and off tryin to get traction while my mates were off in the distance lol
well of coure it's not simple but disregarding things like design and defect it usually does come down to traction vs stiffness/response. I'm pretty sure they're old as the hills and before that they were yokohamas so I guess traction is a bhit too much to expect lol

[screech]

not being silly guys, none of us are handling specialists.

I say youve found a good thing, just go with it, experiment some more and have some fun along the way!