Poor handling after replacing rear tires.

[Moocow]

Hi all,
I replaced my rear Conti 5's with new Kuhmo 39's. I also had an alignment done.
The car now feels terrible! The rear end doesn't feel solid and planted like it did before. Prior the car with my Coilovers felt like a little go cart, and the rear end was so solid, now the rear feels like a cheap arse Falcon.

I've checked pressures on the new tires, we're fine.

Any suggestions, or should I take it back to tyre power and get them to look at it?

Should replace the Conti's on the front also?

Thanks

[flinchy]

directional? (don't look as directional as the KU31 though :/).. old? (check the date on the sidewall?)

[dtcoff]

How many kms have you done on them? New tyres need a couple hundred kms to run in properly, especially noticable if you only change rears as the front will still grip well.

[flinchy]

Originally Posted by yulook

Kuhmos are rubbish... thats probably why

KU31's are even worse.. probably the worst of the lot

Can't tell a difference between FK452's and the KU31's on mine for half the price

not like i'm putting 400+hp through them though hah.

I thought KU39 were meant to be higher performance/lower wear rating than the KU31's anyway?

[DR-JEKL]

What are the before and after alignment specs?

[robbieredknapped]

I had a set if KU39 before. Nothing wrong with them.. Plenty of grip. I think better check alinement spec.

[Moocow]

thanks guys

I get the alignment checked.

cheers

[martymil]

It won't be the aligment Ku 39's are ok nothing great for the same price I would have recommended you the nitto invo, such a better tyre especially in the wet.

I run 12.2 116 mph on the nittos and so far done 13k on the and still heaps of rubber left

[Moocow]

I finally took the car back to the guys at Tyerpower North Melbourne.

They changed the toe on the front I think, to be less aggressive (back to stock). This made all the difference! Sure it turned in a little quicker before, but it was unsettling the rear end way too much.

A big shout out to the guys at TyerPower North Melbourne. Very helpful, easy to deal with and nice guys. Strongly recommend them!!!!!!!!!!!!

Cheers

[BrokenVert]

New tires come with a Teflon like coating to make pulling them out of the mould easy. It takes a couple hundred km for this slick coating to wear off.

[kyratz]

The tyres will need approx 300 kms to scuff in and remove the slippery outer layer from the manufacturing process. Also kumhos are arguably not as high grip/ quality as contis.

[WAY]

Originally Posted by yulook

Kuhmos are rubbish... thats probably why

That's a sweeping statement that is unfortunately incorrect. My JCW GP comes with Kumhos and no one has found a replacement that is better for turn in and grip. Too bad they only last 3000-5000km hard driving and are almost impossible to find.

[Moocow]

Originally Posted by BrokenVert

New tires come with a Teflon like coating to make pulling them out of the mould easy. It takes a couple hundred km for this slick coating to wear off.

Yep waited for a couple of weeks. The Kumhos arent as a grippy, but it was definitely the alignment.