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Old 07-08-2010   #16
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Re: Croma Tyre Choices

Quote Originally Posted by s130 View Post
Clearly some folk like to lead interesting lives on the public highway ...

The ZZR is the tyre for those seeking the ultimate in grip and handling; it's designed specially for trackday use and has the same rubber compound that Avon Tyres Racing employs in its Group N saloon car race tyres. The road-legal ZZR's predictability at the limit makes it ideal for anyone looking to get the most from their car and tyres. The ZZR is designed to give maximum grip in dry conditions but offers considerably less grip in wet conditions where caution should be exercised.

Fitting your car with a premium brand high performance tyre, such as the Avon ZZ3, will also add to your trackday pleasure, giving you greater roadholding and predictable 'breakaway' behaviour when you approach the limit of grip. Alternatively, there's the ZZR, which essentially is a race tyre you can also use to drive legally to and from the circuit.


Source: http://www.avon-tyres.co.uk/car/avon-drivers-track-days
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Old 08-08-2010   #17
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Re: Croma Tyre Choices

pleased to see I have Bridgestone Turanzas on back,One with plenty of meat on it the other on the limit.Don't know if I'll replace it with like, I gather they're very expensive.
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Old 08-08-2010   #18
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Re: Croma Tyre Choices

Quote Originally Posted by leew View Post
pleased to see I have Bridgestone Turanzas on back,One with plenty of meat on it the other on the limit.Don't know if I'll replace it with like, I gather they're very expensive.
... & the front?

Croma Dynamic? 205/55R16 91V ?
That size doesn’t look too much of a problem (from here 225/45ZR18 95W) – the boundaries between top, mid & bottom look reasonably tight. ER300 are around £70, a mid-range (say) Kumho KU31 Ecsta Sport 91V around £60, & the budget around £50.

It appears that folk could easily get stung for a poor tyre - where +£10 would provide for a good tyre. Anyone have experience of that?


Edited 2010/08/08 23:49
Just checked-out some prices on tyretraders - ER300 = £69, Kumho = £59, LingLong/Wanli = mid£50s
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Last edited by Caravadossi; 08-08-2010 at 23:49. Reason: error + text
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Old 09-08-2010   #19
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Re: Croma Tyre Choices

95Y is the required load/speed rating for 18" tyres.

Lower ratings are often cheaper, as they're not built as well as needed (no reinforced sidewall).
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Old 09-08-2010   #20
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Re: Croma Tyre Choices

Will be going in on Weds to have two new Avons fitted to the front, £117 inc vat.
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Old 11-08-2010   #21
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Re: Croma Tyre Choices

I'm on the new replacement for the Goodyear NCT5.
One thing I have noticed is the tyre pressures in the handbook are not correct. I have been running on the part load 35psi and found the sides of the tread was wearing fast so I am now using the full load 39psi.
Something for us to watch?
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Old 16-08-2010   #22
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Re: Croma Tyre Choices

Quote Originally Posted by Granvilleb View Post
... I have been running on the part load 35psi and found the sides of the tread was wearing fast so I am now using the full load 39psi. Something for us to watch?
My ContiSportContact3 have done 15K mls - & while the centre tread has plenty of hours left, the shoulder sipes are not holding-up so well. My OH gives bar as 2.7 (39psi) at warm/med load - mostly solo (or with a.n.other) trips with all-manner of clutter in rear & 42(±20) L of fuel. I’m already running at 2.8 (41psi) as for warm/full load & considering tweaking-it-up further.

Any Croma folks running around 3.0 (43.5psi)? Max is 3.5 (51psi)

While under-inflation causes the centre tread to cave back from the road surface, & increase wear on the shoulders – in contrast, over-inflation is argued not to balloon out the centre tread (due to the steel banding?) … why?

---------------------
55 Prestigio 1.9/16v 150hp (53Kmls): 225/45ZR18 95W SportContact3
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Old 11-11-2010   #23
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Re: Croma Tyre Choices

Right Guys and Gals

I've just replaced all my tyres.

I've replaced the Kumho Ecsta Sports (KU31) with nice Pirelli P7

Data at tyre replacement:

Old Fronts - 19457 Miles - Tread (L) 4 5 4 4 4 3 - (R) 3 5 4 4 5 4
Old Rears - 31142 Miles - Tread (L) 4 4 4 4 3 2 - (R) 2 3 4 4 4 4

NOTE! Rear inner shoulder edge of tyre shoulders were nearly BALD.

Comments: Rear tyre wear much improved but inners well gone. Front tyres
actually have/had plenty more miles to go.

As you can see I've replaced the fronts well early but at least I got 31K miles out of the rears compared to the original 11K miles from new and before the 4 wheel alignment changes.

I've tinkered with the rear alignment, reducing the toe-in.

Problem with my Croma rear suspension is that the toe-in is dramatically affected by the camber and am now running with -2.0 degrees of camber just to stop the toe-in from going toe-out.

Also I originally had -1.6 degress of camber 31K miles ago and the springs have sagged a little in this time moving the camber from -1.6 to -2.0.

I'm really pleased with the P7s thus far. Lets see if I can get 30K miles out of the rears again. Fronts should easily last 24K.
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Old 12-11-2010   #24
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Re: Croma Tyre Choices

Quote Originally Posted by s130 View Post
... I'm really pleased with the P7s thus far. Lets see if I can get 30K miles out of the rears again. Fronts should easily last 24K.
Quite possibly. What version?

I’m impressed with comments on the Cinturato P7 – said to stuff everything in sight for lifespan & noise, & arguably as good dry or wet as any other from the Big 6.

Still undecided on replacements - every new day I seem to change my mind. Tempted by the FK452 or Ultrac Sessanta – but they’re both `heavies.’ Maybe the Uni Rainsport2 – but some find their mpg knocked-back.

-------------------------------------
55 Prestigio 1.9/16v 150HP (Conti SC3 225/45ZR18 95W XL)
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Old 12-11-2010   #25
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Re: Croma Tyre Choices

Quote Originally Posted by Caravadossi View Post
Quite possibly. What version?

55 Prestigio 1.9/16v 150HP (Conti SC3 225/45ZR18 95W XL)
P7's with asymmetric tread pattern. Not Cinturato P7.
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Old 27-11-2010   #26
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Re: Croma Tyre Choices

My 4x 225/45ZR18 Conti SC3 are a few hours short of 20K miles – but given the climate, I decided to replace the front pair a little earlier than expected. Went for a pair of Falken FK-452 95Y at 08:30 this morning & while the snow was being cleared from the fitting bay doors – I noted the DoT coding. Then “U2J7” & “3410” checks-out as manufactured by Sumitomo’s Shirakawa plant in late August. The rear SC3 are now on the front.
-----------
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Old 28-11-2010   #27
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Re: Croma Tyre Choices

I finally got round to getting the £55 Forceum tyres fitted on my 18" wheels. They were fitted to the front and I drove it with them on the front, then I swapped them onto the back.

They are absolutely fine. I don't know why I'd want to pay £90 for the Hankooks again, never mind £200 for a European brand.

I'll see how they go on for wear, but grip and noise levels are perfectly OK.
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Old 28-11-2010   #28
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Re: Croma Tyre Choices

Update on my P7s now I've had them for a few weeks.

Dry handling is very good.
Wet handling is very good.
Turn-in and track stability is very good.
Ride is firm to hard
Bump transition to chassis/suspension is hard
Noise on concrete and lumpy/bumpy/stoney surfaces is medium high to high
Noise on smooth surface (eg. new tarmac) is almost silent

I've not pushed these tyres really hard yet but I will once they have 6K miles on them so come summer 2011 I'll really given them some serious stick.

Overall I would say that they suite the sportier driver style. If you are after a limo smooth and quiet ride then you will only get this on smooth decent surfaces, something we don't have too many of in this country.

Thus far would I buy them again. Yes, though you might not :-)
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Old 30-11-2010   #29
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Re: Croma Tyre Choices

I would add that the Forceum tyres seem a bit harder than the Hankook ones. It's a bit more bone-shaking now, but perhaps there is more air in the tyres now, as I pumped them up to pressure while the weather was very cold.
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Old 01-12-2010   #30
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Re: Croma Tyre Choices

Quote Originally Posted by Doofer View Post

They are absolutely fine. I don't know why I'd want to pay £90 for the Hankooks again, never mind £200 for a European brand.
Thats why:

The Autocar Tyre Test - Chinese Tyre Quality Lags Behind
The Autocar Tyre Test
Chinese quality lags behind

Tyres are a distress purchase for many car owners, so when the time comes to replace them it’s no surprise that many motorists shop on price. But Autocar’s latest tyre test reveals that fitting budget Far Eastern tyres can seriously affect the way a car copes in wet weather.

Imported tyres from China and Taiwan currently account for one-fifth of all tyres sold in the UK, and although these pass the minimum ECE R30 high-speed test, there are no statutory tests for braking, handling or aquaplaning performance, and even the R30 test is considered inadequate by many car makers.

Autocar tested five leading budget brands – the GT Radial, Linglong, Nankang, Triangle and Wanli – against an established premium tyre from Continental. The magazine conducted its own tests for wet handling and braking, dry handling and braking and aquaplaning, plus a more stringent high-speed test.

Autocar senior tester Jamie Corstorphine said, “We expected the bargain tyres in this test to fall short of the Continental, but we were not prepared for just how poorly some performed.”

With on average 200 days of rain each year, a wet handling and braking test is vital for learning about the capabilities of a tyre. Braking from 50mph, the Continental stopped in the shortest distance, followed by the Nankang, GT Radial, Wanli, and Triangle, with the Linglongs taking the longest to stop. Shod with the Linglongs, the VW Golf Autocar used for its tests was still doing 27.8mph at the point where it had stopped on the Continentals.

Overall the Continentals easily won, scoring top marks in all but one test. A consistent performance earned the GT Radials second place, but a wet lap time 3.4sec adrift of the Continentals indicated just how far even it falls short.
“Having seen how the five cut-price tyres in this test perform, we’re in no doubt that quality pays dividends,” said Corstorphine.

and also:
http://www.msnbc.msn.com/id/32899266/ns/business-autos/

You don't know what you're saying in the public forum! Don't encourage anybody to buy this Chinese sh*t!
You will save a couple quid but may injure yourself or whats worse somebody else.
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