I don't give a damn about rude comments really. My skin is thicker than that. What I enjoyed actually is that, despite not agreeing with each other, there was very little "you're a gay idiot and I've done your mum" comments. It's somehow more rewarding having a conversation with someone with a brain.

Let's agree to differ shall we? Otherwise we'll get harassed for arguing, and everyone will get fed up

Quote from tristancliffe :

Let's agree to differ shall we? Otherwise we'll get harassed for arguing, and everyone will get fed up

Yip, kiss kiss, hug hug, lick lick... and so on

Is my tongue still brown?

Is this thread still about tires? Here's my story. I change from 205/45/16 to 195/55/15 every winter and it SUCKS.

Words can not describe the suck. No feedback. Very numb on turn in. Take ages to settle into a turn. with the engine off (and hence, powersteering off), I can poke at the steering wheel and watch as the wheel turns, but the tire stays put on the ground because there's so much give in the sidewall.

while were on the subject of proper damping wheel weights etc while its a small scale example the general idea should hold
the rc cars a friend and i race against each other for fun are near as makes no difference ideantical appart from the tyres wheels and dampers
as far as the suspension goes neither of them has got any arbs both have some random spings on front and back that have been on there for years and none of us know what the wheel frequencies are also the dampers have some random oil in them and are probably mostly filled with air by now

thus far across vastly different sets of tyres and wheels and on tracks and carparks with entirely different tarmack delevation changes corner mix etc theyve been consistently doing pretty much identical laptimes that are only hampered by my inability to drive

point is i still think youre vastly overestimating the improtance of the springs and dampers beyond the point of adjusting the roll stiffness balance to your needs and call it a day
granted i have no idea what the ride comfort might be like in those rc cars but as far as outright performance goes it appears to be almost irrelevant

It might just be that both your cars are setup equally badly, and against a sorted car you'd be lapped hundreds of times

im sure we wouldnt stand a remote chance against a modern well set up car with a driver whos actually competent

while it may well be true that theyre set up equally bad they drive rather differently however i cant say that any of them has any problems with road holding over bumps through off camber corners or whatever else the world of carparks can throw at us

speaking of carparks actually wed probably stand a pretty good chance against the pros since all modern rc cars seem to have a very exposed drivetrain which in the environments we race would fill up with stones almost instantly shredding the belts and rendering the car useless

I'll toss in my two bits here.

Note that profile = tire sidewall height / tire width. A wider tire is going to have a lower profile number even if the sidewall height is the same as a narrower tire. So it would seem that a better question would be the ideal rim size for a given width and outer diameter tire.

Tire construction can compensate for sidewall height. Indy Racing League cars have tall but very stiff sidewalls, and the slip angles involved at the limits for IRL cars are less than that of Formula 1 cars which in turn are less than the lower classes of racing cars.

One issue with "low profile" tires, is the larger wheels and the greater amount of weight, increasing unsprung weight. Since the key factor is ratio of unsprung weight to total weight the weight of the car is a factor.

I can only think of two examples: Light cars like a Formula Ford, Formula Mazda (Rousch), Caterham, seem to do best with 13 inch wheels, and fairly tall sidewalls. Most Porsche 911 track cars are running 18 inch wheels, with relatively shorter sidewalls, but still smaller than the 19 inch wheels you find on some street versions.

Formula 1 cars also have smallish wheels and tall sidewalls, but I don't know the actual numbers.

I imagine a very light car like a Caterham can get away with taller sidewalls as there's a lot less centripetal force that they need to withstand as the car corners.

doe sanyone know the sizes of clio cup wheels and tryes but converted trye sizes to normal tire sizes not in slick measurements please i would extremely appreciate this

Quote from Crashgate3 :

I imagine a very light car like a Caterham can get away with taller sidewalls as there's a lot less centripetal force that they need to withstand as the car corners.

Probably offset by running lower inflation pressures.

Quote from brt900 :

doe sanyone know the sizes of clio cup wheels and tryes but converted trye sizes to normal tire sizes not in slick measurements please i would extremely appreciate this

If you have the measurements in a size format you are not familiar with, post them here and I (or someone else) should be able to convert them.

there is :20/62/17 (these are michelin off a clio cup car)
and these 240/610/17 ADVAN wtcc slicks

Clio Michelin - 200-47R17
WTCC Slicks - 240-37R17

2 x 225/580/15"
and
2 x 200/580/15"

how about these

15" = 381mm
580 - 381 = 199mm
199 / 2 = 99.5mm = sidewall height
99.5 / 225 = 44%
99.5 / 200 = 50%

So they are 225-44R15 and 200-50R15

Hope this helps.

Hi,
i might have an improvement suggestion which wasn't...suggested yet, but first i'd like to hear a few more opinions on whether i am or not right.

After some reading, this thread is as close as it can get, so please excuse me for going somewhat offtopic.

Here goes: in a race tonight during the pit it so happened that only rear right tire got changed, as it was the only one over 80%, as i was 'requesting'.
The other tires were at 79% though. What happened next was different from what i expected.

Not taking into account temperature, should the car have been 'pulling' towards the newest tire simply due to the difference in left to right tires' weight (and also in diameter, but i think that is negligible) ?