91 replies to this topic

[chetwin]

Been out on a new set of federal's this evening. Probably not full scrubbed in yet, but felt good. Braking performance better than KU39's I've had previously. Also feel nicer on the road than R888's.

[JohnTurbo]

Ad08 are the only tire you need. I took them and a048 to oulton and was faster on the ad08 which shocked me. They are better in the wet than 595 too...but a bi more cash.

[Winstar]

I had some KU39's fitted this afternoon to the rears

To say they are 'lively' before scrubbed in is an utter utter understatement. The back end is totally detatched from the front, in a really not good way.

More miles needed methinks. I've never felt the car so unbalanced after a new set of rears, but I never mix fronts to back (KU31's on the front)

Check the pressure I found the same only to find the tyre fitter had put 32 psi in despite me telling him to put 27 in

[Paulus H]

Checking pressure is super important. Giving a definitive review of a tyre is pointless without scrubbing it in to your car.. Using this site to see which tyres scrub in quickly and which tyres take hundreds of miles to scrub in is very useful. Kind regards, Paul

[jules_s]

Checking pressure is super important.

Giving a definitive review of a tyre is pointless without scrubbing it in to your car.. Using this site to see which tyres scrub in quickly and which tyres take hundreds of miles to scrub in is very useful.

Kind regards, Paul

Here we go again 'kind regards, Paul'

Did I give a definitive review of the tyres? No I bloody didn't. I just warned people they are very skittish before being scrubbed in.

IE the sort of advice that stops people ditching their car after having brand new Kumho KU39's fitted.

As for pressures (if anybody needs to know before searching) I asked for 26psi before, during and checked afterwards. 26psi.

The super important psi.that was 26psi. Not 22psi. not 1000psi. just 26psi. they are now 26psi aswell.

You seriously need to wind your neck in

Kind regards, Jules

[ChrisS1]

I had some KU39's fitted this afternoon to the rears

To say they are 'lively' before scrubbed in is an utter utter understatement. The back end is totally detatched from the front, in a really not good way.

More miles needed methinks. I've never felt the car so unbalanced after a new set of rears, but I never mix fronts to back (KU31's on the front)

Edit - just read you've checked pressures.

Was it damp? I'm sure they'll scrub in and perform the same as the 31s on the front but as you say, worthwhile noting it so others can be cautious too

Edited by ChrisSC, 21 April 2013 - 07:16 AM.

[Jason]

You running standard ride height? Wondering what they look like fitted assuming 205/45/16 so got any pictures?

I had some KU39's fitted this afternoon to the rears

To say they are 'lively' before scrubbed in is an utter utter understatement. The back end is totally detatched from the front, in a really not good way.

More miles needed methinks. I've never felt the car so unbalanced after a new set of rears, but I never mix fronts to back (KU31's on the front)

Edited by Јason, 02 May 2013 - 10:25 PM.

[jules_s]

No I had the rears only fitted with the existing Ku31's on the front. Quite frankly, I dont want to drive it at the moment, it's that bad. I drove it to the garage that's doing the suspension and in parts I was lucky to keep it on the road...that bad. GEO checked, pressures checked (all spot on) and it's still woefull. I've only done about 200 miles on them but it really is bloody frightening how badly disconnected the rear is to the front. Imagine an F1 tire warming 'wiggle' ....I'm losing the back end at 30mph

[Jason]

Does not sound good, try some burn outs maybe.. My research seems to indicate people rate these tyres on this thread and elsewhere http://www.racelogic....php?t-973.html This early is really for my own benefit convincing myself the KU39's are not totally crap.

[Bumblebee]

Standard ride height on the ku39's

[Jason]

Thanks Aimy much appreciated

[Mani]

No I had the rears only fitted with the existing Ku31's on the front. Quite frankly, I dont want to drive it at the moment, it's that bad. I drove it to the garage that's doing the suspension and in parts I was lucky to keep it on the road...that bad. GEO checked, pressures checked (all spot on) and it's still woefull. I've only done about 200 miles on them but it really is bloody frightening how badly disconnected the rear is to the front. Imagine an F1 tire warming 'wiggle' ....I'm losing the back end at 30mph

Something clearly not right. I have ku31 on fronts and new ku39 on back. Probably done about 250 miles but no issues with grip experienced.

[Mani]

Btw running 28 psi on rears

[jules_s]

Indeed,

 

I'm still on 26r/24f....but there may be more to it.

 

It's now been MOT'd and predicably failed on the ABS issue and a headlight owl spotting.

 

However an advisory on a rear toe link being worn....not sure whether this would cause such issues from worn to new tyres but I doubt it would help, and time will tell after it's all back together with brand new pretty much everything

 

 

[Mani]

I am sure it will sorted soon. Nothing worse than a Vx not handling right and sometimes it can be due to something quite simple. I just got some new brake pads and am taking it easy to bed them in before I can enjoy the car fully myself

[jules_s]

Yep,

 

It went from pretty much perfect to a horror show after fitting the KU39's...and I may have (with hindsight) made the understandable assumption that the tyres were the issue.

 

However, I guess a vx with 115k on the clock and changing one of the fundemental parts which put you on the road could (and not changing anything else in 115k) highlight inadequacies of all the other worrn out bits.

 

As I said time will tell.

[jameso]

KU39s I think are fine sub 250bhp but i found they were hilariously easy to spin up on a stage 4 turbo. Any more than half throttle in second and they would light up

[Jason]

Well my Kumho KU39's lasted just about 12 months on the rear. Another £165 fitted and I'm happy That with a 4 trackdays; Bedford Autodrome, Goodwood, Hethal, Rockingham and approx 10K road miles.

[CHILL Gone DUTCH]

I've been out today and I must say the federals are very poor in cooler conditions until they have been worked a little Very easy to lock the front up until I really worked them hard But the the rear 235 are very good

[Paulus H]

Checking pressure is super important. Giving a definitive review of a tyre is pointless without scrubbing it in to your car.. Using this site to see which tyres scrub in quickly and which tyres take hundreds of miles to scrub in is very useful. Kind regards, Paul

Here we go again 'kind regards, Paul' Did I give a definitive review of the tyres? No I bloody didn't. I just warned people they are very skittish before being scrubbed in. IE the sort of advice that stops people ditching their car after having brand new Kumho KU39's fitted. As for pressures (if anybody needs to know before searching) I asked for 26psi before, during and checked afterwards. 26psi. The super important psi.that was 26psi. Not 22psi. not 1000psi. just 26psi. they are now 26psi aswell. You seriously need to wind your neck in Kind regards, Jules

Nutter?