Jump to content
SAU Community

Recommended Posts

mythbusters isnt needed dude. some common sense and thought is all that is needed :P

the inner and outer circumference cant be changed. the inside being the rim size, ie 18". no matter how wide that rim is (within reason) its always 18"

the outside, the rolling diameter also remans the same because only the sidewall angle changes. it doesnt get longer, or shorter.

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967232
Share on other sites

  • Replies 49
  • Created
  • Last Reply

Top Posters In This Topic

mythbusters isnt needed dude. some common sense and thought is all that is needed :P

the inner and outer circumference cant be changed. the inside being the rim size, ie 18". no matter how wide that rim is (within reason) its always 18"

the outside, the rolling diameter also remans the same because only the sidewall angle changes. it doesnt get longer, or shorter.

ahhhh lol but thats why the rolling diameter DOES change!

i give up. you win by default lol

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967240
Share on other sites

i dont want to win im trying to explain how it doesnt change

its also steel belted so it cant change.

only the sidewall angle can change to suit the rim width, yes the sidewall will flex. but thats half the reason why the tyres are filled with air.

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967242
Share on other sites

something would have to change as you get some pretty big angles when stretching tyres (big angles for engineering are anything over 5°)

but you are correct, the cylinder that makes the tyre cannot get that much smaller (but the rubber is elastic so it can contract a little bit)

so the sidewalls must either get dragged inwards on the rim or stretch a little

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967248
Share on other sites

i dont want to win im trying to explain how it doesnt change

its also steel belted so it cant change.

only the sidewall angle can change to suit the rim width, yes the sidewall will flex. but thats half the reason why the tyres are filled with air.

based on the fact that the sidewall will physically stretch, and that rubber is softer that the steel belts, your right. makes sense now. if it was all rubber, physics simply wouldnt allow it.

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967250
Share on other sites

the sidewal is designed to flex and distort. its normal for a tyre to do that (within reason) but when you stretch them, youre not allowing much movement. thus the tyre is 'firmer' and doesnt allow it to..... squirm?

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967640
Share on other sites

i know im goin to get flamed to death for saying it, but IMHO the federal 595 is highly over rated on a daily drive car. they are great for a weekend warrior or if u do ALOT of hard cornering. but for the daily commute i'd suggest something thats a little better in the wet and maybe wears better. i also agree with the other guys a 245 is pretty narrow on a 9.5 inch rim. id be goin a 265 to protect the rim a little better.

I'll be flamed with you then. The wife had a big accident on Bells Line of Road going down into Lithgow on these. Conditions were wet. Now, not saying that it was entirely the tyres fault, thats impossible and stupid to even consider that. However, I believe tyres play a big part of the dynamics of a car. Needless to say, post accident, Pirelli tyres went on all 4 corners.

I wouldn't consider buying them again, but thats just my opinion/experience.

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5967693
Share on other sites

  • 2 weeks later...

mythbusters isnt needed dude. some common sense and thought is all that is needed :P

the inner and outer circumference cant be changed. the inside being the rim size, ie 18". no matter how wide that rim is (within reason) its always 18"

the outside, the rolling diameter also remans the same because only the sidewall angle changes. it doesnt get longer, or shorter.

i understand what your saying. but they are right. try it for yourself. head down the tyre shop with an 8inch and a 9inch rim and have 2 identicle tyres fitted and inflate them to the exact same pressure then messure the circumference. there will definately be a difference. it wont be much (0-5mm), but they will be different. you answered it yourself when u said:

"the sidewal is designed to flex and distort. its normal for a tyre to do that (within reason) but when you stretch them, youre not allowing much movement. thus the tyre is 'firmer' and doesnt allow it to..... squirm?"

the stretched tyre is under tesion and cant balloon out where as the unstretched tyre will. thus changing the circumference

Link to comment
https://www.sau.com.au/forums/topic/373541-tyres/page/3/#findComment-5988174
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • There's no current law that stipulates that you cannot eat dessert with a soup spoon, although, it is socially unacceptable of course, shame on you But, there are emissions laws, which is sort of on topic to the OP's questions Things like emissions are, if anything, going to get stricter in the future for road registered cars I believe, 'Merica has yearly emisions testing in some states, the UK has it's yearly MOT testing as well which includes emissions Building, and purchasing modified vehicles may become alot more problematic if you want to keep them registered, how, if, and when each state handles this is anyone's guess  More food for thought really
    • I'm on the AD09, strictly on the street. They are a very nice tyre, have done ~16k km and are near the end, might make it to 20. They are, in my opinion, very much just a street tyre. I wouldn't expect them to be equivalent to some of the others in your list on the track. Although I'd be pleasantly willing to be surprised. My memory of the AD08Rs is vague enough, due to the passage of time, that I shouldn't try to compare them, but I feel as if the AD09 is not quite as "sporty" as the AD08R was.
    • There's a difference between "selling" a product to someone (which, if you walked into a workshop or bricks and mortar store and bought and walked out with it, is just the act of buying and selling) and rolling your buggy into a workshop and having them fit non-roadworthy stuff to the car. And for the latter, let's ignore any potential legal loophole arguments that the armchair lawyer might want to make to differentiate between supplying your own parts to be fit by the workshop or getting the shop to supply and fit. The workshops that have been dealt with in the US for this are in the latter category. It would be near impossible to try to charge/attack/criminalise a shop for selling "for off road use only" parts to someone unless those things were intrinsically illegal in their own right, or had other legislation wrapped around them, such as there is for guns, pharmaceuticals, etc. Well, no. And you knew your argument was silly when you made it. And there is. it might be somewhat harder in Vic, but then that's the price you pay for electing the long list of (unts that you have to run the whole shit hole**. But otherwise, you can put an aftermarket or otherwise tunable ECU into a car and get it run through the whole shebang of emissions testing as part of an engineering cert and, so long as the tune is "locked" afterwards, then that modification is on the list that is approved on the cert. But....it is an expensive process. ** Of course, the (unts who make up a large proportion of the population that eternally try to get around the rules are also a part of the problem and the reason that you end up with draconian rules in the first place. By contrast, SA was founded and the government and civil service set up and run by very sensible types (largely German) who set up good structures that enabled a lighter touch of government on the somewhat better behaved population. it is only more recently that we have followed the rest of Australia down the criminal drainhole of penal colony behaviour and now we have to catch up with mobile phone cameras and so on.  
    • Not specifically the revamp Toyos. In the past I've used Nitto NT01s, which were essentially the same compound as R888 with a different pattern (that's what the internetz said, so just be facts). I did like the NT01, progressive fade, didn't go from grip to 0 grip in a split second. If you look at the serious street/track guys, most are either on Cup 2, A052, A050, AD09, CR-S or AR-1.  
    • I have one of these! It is absolutely useless. It provides not nearly enough force on the bolt, it just slips over anything that is not finger tight. And if it's finger tight, you can use your fingers.
×
×
  • Create New...