Jump to content
SAU Community

Tyres

capturedcreation
 Share

Recommended Posts

zei20l Grand Master

zei20l

Posted
Posted

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

Popular Days

Top Posters In This Topic

Popular Days

Sunkist Grand Master

Sunkist

Posted
Posted

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
zei20l Grand Master

zei20l

Posted
Posted

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
pipster11 Grand Master

pipster11

Posted
Posted

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
Sunkist Grand Master

Sunkist

Posted
Posted

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
zei20l Grand Master

zei20l

Posted
Posted

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
PN-Mad Grand Master

PN-Mad

Posted
Posted

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...
Raysboostin Mentor

Raysboostin

Posted
Posted

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Dose's Sometimes DIY and Pay Someone Home & Boat Improvement Thread

      By MBS206 · Posted

      Why are people so insistent on making dirty water?!
    • Dose Pipe Sutututu
      Duncan's V37.......race car?

      By Dose Pipe Sutututu · Posted

      Fark what are the changes of that snapping like that, clean. Nek minnit, custom radiator goes in, with built in oil cooler like those discontinued PWR ones from yesterdeacades ago
    • Duncan
      7 Speed Auto transmission fluid change (Skyline, Q50, Q60, Fuga, Q70, A62 Titan and probably heaps of others including Navara...)

      By Duncan · Posted

      I thought I'd do a write up on an auto transmission fluid change for a the nissan 7 speed Automatic. At some stage the genius engineers decided that the fluid in the trans was "for the life of the transmission", (which seems kind of self supporting to me) and removed the dip stick and fill tube (funnily enough there is still a casting for it). Anyway, for this job you do need 2 specialist tools in addition to regular hand tools, jack and good chassis stands. You need a way to pump fluid up to the transmission; I got one of these but there are plenty of other options: https://www.ebay.com.au/itm/364584087070 Don't trust the generic listing though, it does not come with the required adapter for the Nissan 7 Speed. You need one of these, can't do the job without it: https://navarapart.com.au/product/genuine-nissan-patrol-y62-d23-np300-navara-re7-dipstick-fill-connector1 You need a heap of compatible transmission oil. Could be Nissan, could be anything else rated for Nissan Matic S. You need at least 10 litres, I had 15 to give it a better flush... Also, you need some biiig oil catch trays, at least one of these, or bigger if possible (volume was fine, size was very marginal): https://autobarn.com.au/ab/Autobarn-Category/Tools-%26-Garage/Specialty-Tools/Oil-Service/Garage-Tough-Oil-Drain-Pan-Black-16L---GT1068/p/TO03191 Finally, a measuring jug is very useful if your pump does not have volumes marked on it, I got a 6l one: https://www.repco.com.au/oils-fluids/fluid-accessories/measuring-jugs/penrite-measuring-jug-6l-pmj006/p/A5322648 Oh, and gloves.....this stuff is horrible (not as bad as diff oil, but getting there) ....First, jack up your car.....
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      So I mentioned the apprentice, @LachyK helped take the bonnet off. We just undid the nuts on the hinges and unclipped the gas struts, then pulled the bonnet back a little as the front was catching on the front bar.  I had a good look at everything today and have removed the rams, repaired/reset the hinges and bolted it back together like it never happened. I'll do a separate write up on the repair, and I also removed the poppers from the Fuga today too to save grief down the road.....as said above it is at least $5k to repair retail. I'm also happier about my ability to prepare a race car, and less happy about Nis-nault's engineering (I can hear @GTSBoy sAfrican Americaning) because the top hose of the radiator didn't slip off.......it snapped clean off. By practice I put the hose clamp hard up against the flare on a neck to make it least likely to ever move (thanks @Neil!). I guess that puts a little more pressure on the end of the pipe as it is further away from the rad, but still, that is pretty shit. I've put it back on for now as there was a fair bit of neck still there, but obviously there is no lip on the neck any more so I don't think I'll track it again until I have a new rad. Speaking of which....more research required. It looks like Koyo makes a standard size radiator in ally which I'll grab in the meantime, but I really want something thicker so might have to go custom in the medium term (ouch) Coolant still needs a refill and I have the pressure tester on it over night, but other than a wash down of the engine bay it seems alright. And @MBS206 noted something noisy on the front of the engine and I think I agree....time for a new accessory belt and tensioners I think.
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      our good friends at nismo make a diff for it, I have one (and a spare housing to put the centre in) on the way. https://www.nismo.co.jp/products/web_catalogue/lsd/mechanical_lsd_v37.html AMS also make a helical one, but I prefer mechanical for track use in 2wd (I do run a quaife in the front, but not rear of the R32)
×
×
  • Create New...