Silvia Club of NSW

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PostPosted: Thu Jan 18, 2007 11:35 pm 
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TO4

Joined: Sun May 14, 2006 6:37 pm
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Car: s15
Hi guys,

I need to change my rears and was wondering what would be the best size in your opinion?

Currently I have 235/40/17, should I keep this size or should I pick another one?

Cheers
Kostya


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PostPosted: Thu Jan 18, 2007 11:55 pm 
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i have 235/45/17 on my rims at the rear, got a S15 there is also a tyre calculator in the technical area on the main index of the site...


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PostPosted: Fri Jan 19, 2007 7:33 am 
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I wouldn't go over a 225 on an 8 inch rim. Any smaller and it will be a bit stretched (which is ok up to a point), Any bigger and it will start to bulge out a bit (which i'm not a fan of).

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PostPosted: Fri Jan 19, 2007 11:52 am 
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Location: 127.0.0.1
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235s sit with square sidewalls on an 8" wide rim.

235/40/17 will be slightly smaller than stock rolling diametre, whereas a 235/45/17 will be slightly larger.

I use 235/45/17 personally.


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PostPosted: Fri Jan 19, 2007 1:03 pm 
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235/45/17 - as the local falcodores use this size alot, should prove to be easier in find the right tyre as its common.

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PostPosted: Fri Jan 19, 2007 6:44 pm 
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but I guess 235/40 wpuld handle better than 235/45 right?


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PostPosted: Fri Jan 19, 2007 7:54 pm 
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There are other things you can look at into tyre performance first, rather then a 5% decrease in profile size.

You can try buying better compound for a start before anything else

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PostPosted: Fri Jan 19, 2007 7:55 pm 
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maybe 0.01% better?


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PostPosted: Sat Jan 20, 2007 3:00 pm 
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Joined: Sun Aug 06, 2006 11:43 pm
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you can go down to 215 on 8" (I have this right now on the fornt of mine) but the sidewalls taper a bit. 235/40 were on before and were just right IMHO. A 45 section gives rubbing problems if you've lowered your car.

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Rich


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PostPosted: Sat May 12, 2007 6:40 pm 
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Ive found a 235/40/17 feels better on the back than a 235/45/17

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PostPosted: Tue Jun 05, 2007 8:08 am 
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wouldnt a slightly stretched tyre provide better turn in response due to less tyre wall flex at a higher G turning?

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PostPosted: Tue Jun 05, 2007 8:44 pm 
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blue180 wrote:
wouldnt a slightly stretched tyre provide better turn in response due to less tyre wall flex at a higher G turning?


Sure would. Ive gone from 225/40/18 on an 8.5" rim to 225/50's on a 16x7.5 rim and the amount of sidewall movement at high speed gets a bit scarey since there was none with the previous stretched tyres on bigger rims


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PostPosted: Wed Jun 06, 2007 8:18 am 
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that's assuming that you're not overcoming the grip level of the tread itself already.

factory recommended width for an 8" rim is a 235. I run 235/45/R17's all 'round on my wagon,and they work well enough. this is also a common-as size,so they're cheaper to come by.


Justin...

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