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[cem_devecioglu]

I wasn't expecting others to agree, mind. I was merely stating what I've found out over the years.

I buy maybe 40 tyres a year, of different makes varying from premium to cheap- and yes, I really have yet to find a great difference in wet grip between new premium tyres and new cheapos. Driving style, ambient temperature, road surface and car spec all have much bigger effect.

Last time I did a tyre test for a manufacturer ( which was a long time ago ), we found something like a 10% variation in wet grip between best and worst.

Most of these tyres end their days on track, where the cheaper, softer ones usually provide more grip, but don't last as long.

2woody, probably you are not choosing worst tires..
 
a tire, in real life is subject to very different magnitude forces  and stress tests.. just a simple example is wet braking and lateral g forces that tire can withstand..
 
say you are cornering a road with a relatively high speed when you exceed the limit of lateral g force the difference is you end up with an accident..
 
similiar is also true for braking.. either you stop or dont stop..
 
please check this link
http://www.conti-online.com/generator/www/de/en/continental/automobile/themes/news/download/dl_artikel_pdf_en.pdf
 

[2woody]

it's funny you mention that - the tyre test that I was doing was for Continental ( and Volvo ). All about cornering and braking stability in the wet using a range of different tyres. Not in Germany, but at MIRA.

From memory ( and it was in the 1990s ) the worst combination we used was from four different manufacturers.

the test you posted has about a variation in the 20%s - but do remember it's performed by the manufacturer who stand only to gain from positive results.