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VE SS Tyre fitment advice pls 245's or 255's best pairing with 265 rears

losh1971

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245/35, wall height =35% of the tyres width. So if you have a 265/35 it will be taller because it's 35% of the width of the 265.
 

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Honestly if it were me, I'd be going the 245/35 for 2 reasons....Easier to obtain, and cheaper and 2ndly it is a factory fitament....

Righto, so I've read on a thread here somewhere (or maybe it was elsewhere ?) that supposedly anything under a 3% overall diameter variance from the factory fitment should not cause any issues with the braking system and other electronics. Is this accurate from your experience as a wheel and tyre guy ?

245/35, wall height =35% of the tyres width. So if you have a 265/35 it will be taller because it's 35% of the width of the 265.

Ok sure got it, thanks - but what does that mean to my equation of potentially pairing the 265/35 rears with 245/35 fronts. Ok -Good ? or Bad idea not good?
 

losh1971

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I'd be punching those figures including rim size into a calculator and seeing if the OD changes much from the stock 245/45/18s. The SS is already too tall gear wise and unless you plan on a regear it will only be worse than it is now.
 

Kev38

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I'd be punching those figures including rim size into a calculator and seeing if the OD changes much from the stock 245/45/18s. The SS is already too tall gear wise and unless you plan on a regear it will only be worse than it is now.

Well I'm not sure where or how to actually do that Loshi and tbh I'm not sure if I would understand the results it spits out even if I did magically get it right.

My SS is an auto if that makes any difference and no I don't intend on a regear, I don't know anything about such wizardry. Hell, I don't even want to roll the guards let alone anything else.

I just want to try and find the best option possible for tyres to fit to the brand new rims I have sitting in the garage. If there's other better options you or anyone else can suggest I'm all ears !
 

vc commodore

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Righto, so I've read on a thread here somewhere (or maybe it was elsewhere ?) that supposedly anything under a 3% overall diameter variance from the factory fitment should not cause any issues with the braking system and other electronics. Is this accurate from your experience as a wheel and tyre guy ?



Ok sure got it, thanks - but what does that mean to my equation of potentially pairing the 265/35 rears with 245/35 fronts. Ok -Good ? or Bad idea not good?


Factory HSV fitament was 245/35X20 on the front and 275/30X20 on the rear....This means no issues with electronics
 

Kev38

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Factory HSV fitament was 245/35X20 on the front and 275/30X20 on the rear....This means no issues with electronics

Yep understood about the factory fitment meaning no issues with the electronics but would the same apply do you think with my proposed fitment of 245/35R20 & 265/35R20 ?
 

losh1971

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The issue is the HSV have shorter gears than the SS. This will mean the shift points may be affected in the trans, plus the speedo will be out. This is all assuming the OD is larger than what a stock SS has with 245/45 18s. I have never used a calculator other than a desk one to work out ODs.
 

losh1971

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I tried doing a manual calculation and it would seem a 265/35/20 is smaller than a 245/45 in an 18. But I may have miscalculated.
 

Kev38

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The issue is the HSV have shorter gears than the SS. This will mean the shift points may be affected in the trans, plus the speedo will be out. This is all assuming the OD is larger than what a stock SS has with 245/45 18s. I have never used a calculator other than a desk one to work out ODs.

I tried doing a manual calculation and it would seem a 265/35/20 is smaller than a 245/45 in an 18. But I may have miscalculated.

The online calculator I used to quote the dimensions in my earlier post above shows that the stock 245/45R18's have an OD of 677.70mm.
The 245/35R20 is pretty much the same with an OD of 679.50 mm

The 275/30R20 has an OD of 673 mm whereas the 265/35R20 has on OD of 693.50 mm.

So the 265/35 is 15.8mm bigger than a 245/45, not smaller.

The 245/275 combo is the ideal one of course but I can't go with it because the offset of my rear 20x10 rims is only +42 and they will rub the guard lips. I'm of the understanding that a minimum of +45 is necessary with a 275 tyre to avoid rubbing without a guard roll.

The online calculator also says that with a 245 & 265 combo the speedo will be out by 2.02 k's per hour.

However this is obviously a generic online tool and there's possibly Holden VE SS specific stuff I need to factor into considerations. Which is why I'm here and what I'm trying to find out (Thanks for your help so far btw mate - much appreciated !)
 
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