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joffa1

Quick tyre question

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Hi guys quick one

 

have Factory 19 inch rims on my FG XR6T Ute,

 

running Kumho 245/35/R19s on front wheels

 

destroyed one of my rear tyres the other day but both rear were pretty low on tread anyway so going to replace rears (still plenty of tread on the fronts). 

 

My question is is can I run a wider and slightly higher profile tyre on the rears?

 

have a good deal on some Hankooks 275/40/R19s 

 

so basically just want to know if it’s ok to have a 40 profile on the rear and a 35 on the fronts and if I can go this wide also?

 

thanks for any advice!

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Your posts are contradictory, do you have 245/35 or 235/45 on the front? Big difference in rolling diameter 

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Sorry my bad!

 

245/35 on the fronts

 

I guess I’m hoping to go wider for more grip and a higher profile to smooth out the ride a little if that helps?

 

with a view to going a higher profile up front once they wear out too. 

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You don't want to be running 275/40/19 up the back then, rears will be nearly 50mm bigger diameter.

Plenty of conflicting info out there you can google, but I wouldn't be using tyres more than say 2% difference in diameter front/rear.

275 is way too wide for the factory rims anyway which if I remember correctly are only 8.0" - 245 is max 'recommended' width for an 8" rim, you could probably go to a 255 without too many dramas.... @arronm?? 

 

Best way to 'smooth out your ride' would be to go to an 18" wheel but probably not what you want to do.

 

Jump on http://willtheyfit.com and play around with your options, personally I'd be sticking with the 245/35 (or go to a 255 if it fits ok - some tyre brands are wider/narrower than others even size for size) or go 245/40 all round, or get different (ie. wider) rims and run wider tyres.

 

Check out http://tyresales.com.au and https://tyres.supercheapauto.com.au or your local tyre guy and see what's out there, read reviews, use the search bar on here and make your decision.

Edited by camo86T

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I actually looked at going down to 17 or 18 rims and running a higher profile tyre. Had a nice set with good tyres lined up but bloke sold them before I got there. Still keeping an eye out. 

 

Ok so 255 width on rear should be ok. What about a slightly higher profile. I.e. 40 on rear and keep the 35 up front? I would imagine this would be ok?

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Have someone selling a set of clean 17s now but with good tyres on and I’m assuming a 45 profile on a 17 inch rim would give a smoother ride? I.e. road noise and bumps not quite as harsh?

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it's all about sidewall and associated flex. it's hard to get good sidewall on 19's/20's but is definitely do-able on 18's and smaller.

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Ok I think I’ll bite the bullet and buy the 17s with the 45 profile tile on them. At least I’ll have a spare set of rims even if I’m not happy with the ride on them. Cheers. 

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The 17s are too junk so keeping the 19s for now.

 

Given that does anyone have a definitive answer on whether it’s ok to run a 245/40/19 or even a 245/45/19 on the rears and a 245/35/19 on the fronts? Once the fronts wear out I will replace them with exact same tyres as the rears.

 

dont want to drive around on the spare much longer so would love a definitive answer. Thanks. 

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Go the willtheyfit website I posted a link to earlier and enter the different sizes you've mentioned. You'll find that the 245/40/19 is about 25mm or 3.6% bigger than the 245/35, while the 245/45 is nearly 50mm larger diameter or around 7%.

The "acceptable" size difference  will depend on who you ask but above 3% is generally considered a no-no due to potential ABS issues.

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Yeah I took a look at that and saw that the mm difference for the 245/40 profile is more than I thought. All good sticking with same profiles for now. Will look to change all 4 tyres and possibly rims at same time down the track. Thanks for your help. 

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A good set of Ford 17 inch rims with 235/45/17 tyres has come up at a good price. 

 

Would this setup provide enough grip for an unmodified fg turbo? Or is 245 the minimum width required...

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Width wise there is fark all in it and depending on the tyre manufacturer there could be a lot less difference than 10mm of tread on the road. Tyre quality will play a much larger factor in getting grip.

 

Cheap tyres= short life with some grip (semi slicks) or slightly longer life with poor grip. The sidewalls generally suck arse with cheap tyres too.

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I dunno as I haven't used them but they are a $100 tyre so I wouldn't put much faith in them based off that. They might be fine though.

 

Most tyres should be fine for a stock car anyway. I was just pointing out before that quality is more important than a small size difference on paper.

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