ku39 kumho 20x10 wheels

[rodders188]

The car is booked in for Kumho KU39 275/30 20 rear and 245/35 20 Fronts, the rims are new Niche GT M133 Sport, 20x10 and 20x8,5 40 offset and front 35

Initially I thought maybe a 255/35 20 rears to avoid any rubbing on guard

On the tyre side of things, for the price I couldn't really resist, 4 for 3 price $825 fitted , originally was getting RE003 Bridgestone but went into shock when I slept on the 1765 fitted which I would love to have but the price killed it, so cancelled and went Kumho instead as the car isn't driven hard, and is every day driver, the roads in WA are long and straight

Questions, is the 275 tyre going to rub the inner guard on my VE SS V Sedan, its lowered on King SSL Springs, ? Any comments on the Kumho tyre be appreciated as well...

cheers

[Wonky]

I wouldn't go 255 wide on 10" rims! Apart from looking stupid due to being too narrow they must be borderline illegally narrow given manufacturers typically run tyres 20mm wider on 12.7mm narrower rims.

I ran DTM Shine 20x10 (+45 offset) on my SSV ute with 275 Kuhmo KU31s and once the guards were rolled only very, very occasionally scraped on certain bumps when I'd just filled up with petrol. That was with King SSSLs! When I later went to the H&R coilovers (slightly stiffer but very comfortable) it never rubbed.

I've never had the KU39s and given I never push my car hard through corners found the KU31s quite good. Many people who've gone to them from the OEM Bridgestones find them pretty equivalent at about half the cost. Only thing is the KU31s tend to get noisy as they wear, though I did hear the KU39s supposedly addressed that.

[rodders188]

I wouldn't go 255 wide on 10" rims! Apart from looking stupid due to being too narrow they must be borderline illegally narrow given manufacturers typically run tyres 20mm wider on 12.7mm narrower rims.

I ran DTM Shine 20x10 (+45 offset) on my SSV ute with 275 Kuhmo KU31s and once the guards were rolled only very, very occasionally scraped on certain bumps when I'd just filled up with petrol. That was with King SSSLs! When I later went to the H&R coilovers (slightly stiffer but very comfortable) it never rubbed.

I've never had the KU39s and given I never push my car hard through corners found the KU31s quite good. Many people who've gone to them from the OEM Bridgestones find them pretty equivalent at about half the cost. Only thing is the KU31s tend to get noisy as they wear, though I did hear the KU39s supposedly addressed that.

Thanks
I preying the 275 will be ok and not rub on guard the current wheel on rear is 19'' 275/35 Tyre , no rub at all , so may get lucky, car is on SSL Kings at moment and the tyres are fitted tomorrow!! However from looking today, the plastic liner in the guard is gonna be close to the edge of inner wall of tyre.
The thing about the whole changing wheels is the placard in the door, only says 245/40 19, 98 W, yet VE HSV can run a 275/30 20 97Y from factory, I which if I was to try and match the index rating of 98W on the SS, with 20'' Rims, Im buggered if I could find 20'' tyres that will work.

[Wonky]

Must admit I cheated and put a HSV tyre placard on, not that that really counts for anything if a cop knew his stuff and peeled back the door rubber covering the HSV logo. In your case, I haven't kept up with the latest VF stuff - do any non HSV VFs come with staggered 20s?

[rodders188]

That's a good question Wonky, not sure why HSV and Holden have placards for 19 and 20s yet VE VF SS Holden can only run a 19'' wheel n tyre rated to 98 W unsure if the VF have placards for 20's anyway I am replacing the placard with a HSV Tyre Placard for 19 and 20's , this actually this was suggested by my local Holden Dealer Parts, who have ordered me a placard. As long as the tyres match the placard , I cant see a problem.

KU39s , look pretty decent, im very happy with the price im paying for all 4 fitted and balanced $825

[Wonky]

From when I did it I believe that, like many of the things we do, using a HSV placard on a non HSV is technically illegal but hey, if it works it works!!

[CLUBRED]

I thought the redlines had staggered fitments?

[jc_sv8]

Redlines have staggered wheels, but are only 19 from the factory.
The Lowndes and the Collingwood editions had 20's standard.

[team illucid]

Thanks
I preying the 275 will be ok and not rub on guard the current wheel on rear is 19'' 275/35 Tyre , no rub at all , so may get lucky, car is on SSL Kings at moment and the tyres are fitted tomorrow!! However from looking today, the plastic liner in the guard is gonna be close to the edge of inner wall of tyre.
The thing about the whole changing wheels is the placard in the door, only says 245/40 19, 98 W, yet VE HSV can run a 275/30 20 97Y from factory, I which if I was to try and match the index rating of 98W on the SS, with 20'' Rims, Im buggered if I could find 20'' tyres that will work.

You have to match or exceed the placard - so for example, you could run a 105W nitto tyre in 275/30/20 no problems, but you couldn't run a 93W in the same size.

As for those wheels and tyres, you will need to massage the rears guards a little to make them fit without rubbing. I have a set in the garage of the original wheels (before they put the grooved niche on the rim) with 275/30/20 on the 10" and 255/35/20 on the 8"

My experience on a non-lowered VE Clubsport wagon was that they did not rub at all, but on my wife's VE Senator (also non-lowered) they rubbed on every corner, and every half decent bump in the road.

As for the tyres, the KU39 I have just put on the Senator (285 rear and 255 front) and they are brilliant in the wet and the dry (not that we have had much dry here lately - but exiting corners in the wet I can give a decent amount of throttle where before I could barely feather the throttle without wheelspin)

[Wonky]

Redlines have staggered wheels, but are only 19 from the factory.
The Lowndes and the Collingwood editions had 20's standard.

In that case they'd be very pernickety if you had a tyre placard from one of those non HSV variants and were picked up on it.

[sjhugh]

This is the tyre placard from my VF2 Redline.



Without knowing the legal requirements in WA, the rule for the Eastern States is as follows:

I’ve lifted this from the RTA NSW requirements which are generally the same for most States.

Wheels
As a general rule, it is recommended you only fit wheels and tyres that are listed on the tyre placard or in the
owner’s handbook. These have been tested and proved for your car.
Sometimes the range of wheels listed by the manufacturer may appear to be limited. While it is recommended
that you only fit these wheels, the RTA does not oppose the fitting of wheels outside the range providing they are
safe for the vehicle.
An important requirement for all replacement wheels is that the wheel track must not be increased by more than
25mm beyond the maximum specified by the vehicle manufacturer for that vehicle.
Where non original axle or suspension components are fitted, the offset of the wheel in relation to the axle or stub
axle assembly used shall not be increased by more than 12.5mm each side of the vehicle based on the specifications
of the axle components used. If an axle assembly is shortened then the track width limit is taken as the axle
manufacturers original track dimension, less the amount the assembly has been narrowed, plus 25mm.

It goes on to say you can go up to 26mm wider than OEM and that the overall tyre diameter cannot be increased or decreased by more than 15mm.


http://www.rms.nsw.gov.au/documents/...si-09-rev4.pdf



If a variant of your model runs a bigger and wider rim/tyre combo it is usually accepted ok and therefore the HSV which is registered as a Commodore and the VF2 which is the same platform as the VF should be ok to use as your baseline.

I don’t know anything about Kumho tyres as I’ve never owned them but most reports are they are good value for money.

If you don’t roll the rear guards I do believe you’ll rub with that rim offset as it’s a little aggressive.

I run a 275 on a 10.5 inch rear with a +42 offset on a lowered car and I can get away with a 285 without scrapping but it definitely would if the guards weren't rolled.

I have a Ute and it never carries any weight in the back.


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[rodders188]

Thanks for that good info, I bought a HSV Tyre placard from my local holden dealer, for 19's and 20's, I had the wheels installed and there is scrapping over bumps, not major, but enough to annoy and warrant attention. The 20's seem a lot more smoother and less harsh than 19's. The kumho on 500 km drive seemed pretty decent, quiet, as far as the actual look of the wheels, im more partial to the ones that were on!

[rodders188]

Im wondering if there is much speedo error ?
New wheels
20x10 275/30 20
20X8.5 245/35 20

Old
19x8.5 245/40 19
19X9 275/35 19

[offshore]

Use this http://www.willtheyfit.com/

Can change the speed error in the E38 ecu

[sjhugh]

Im wondering if there is much speedo error ?
New wheels
20x10 275/30 20
20X8.5 245/35 20

Old
19x8.5 245/40 19
19X9 275/35 19

Not much and well within acceptable limits.


Front:

19x8.5 – 245/40R19 – overall diameter = 678.60mm – 100.00 km/h
20x8.5 – 245/35R20 – overall diameter = 679.50mm – 99.87 km/h


Rear:

19x9 – 275/35R19 – overall diameter = 675.10mm – 100.00 km/h
20x10 – 275/30R20 – overall diameter = 673.00mm – 100.31 km/h



Front To Rear

OEM existing differences

245/40R19 – 100.00 km/h
275/35R19 – 100.52 km/h

Aftermarket differences

245/35R20 – 100.00 km/h
275/30R20 – 100.97 km/h




http://www.1010tires.com/Tools/Tire-Size-Calculator


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