Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[TheBoy]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

[cem_devecioglu]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

[cem_devecioglu]

Let them scrub the coating/new layer/slippery bit off and then se how they perform.

So, these test on brand new tyres are pointless then

it means if the owner always purchases used tyres, will never get the first few months performance..

[05omegav6]

Ok allow me...

I have only ever had four different tyres on my Omega, (3.2 Estate with SL and used as a taxi),so in no particular order...

1. Goodyear NCTs, 225/55/16. Predictable wet or dry, but quite soft, lasted 10-12k,  £200 per pair iirc.
2. Durun 225/55/16 97W XL. Crap, wet or dry, lasted 3k, but front geometry was out, £140 per pair.
3. Autogrip F107s 225/55/16 97W XL. Ok in dry, crap in damp, deadly in wet, 10k+ v.durable if car set up properly, £140 per pair.
4. Runway Enduro 916+ 225/55/16 97W XL. Predictable wet or dry, proved good on snow as well. 20k if car set up properly, £140 per pair.

I've a set of MV6 wheels being refurbished, and have ordered Runway Enduro 916+ 235/45/17 95W for them. Can't comment yet, but they are £148 per pair. The same pattern is also available in 235/40/18, and will try them later if the 17"s prove as good (for me) as the 16"s.

[cem_devecioglu]

this link gives thread depth vs stopping distance ..  ( I hope you accept this organization valid)
http://www.rospa.com/roadsafety/adviceandinformation/vehiclesafety/tyresafety/tread-depth.aspx
 
so trying to get idea with old tyres , briefly is not a good idea..
 
 

[D]

Let them scrub the coating/new layer/slippery bit off and then se how they perform.

So, these test on brand new tyres are pointless then

The Conti/Bridgestone test site runs them for a 1000 miles before testing them, from memory?

[feeutfo]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

[cem_devecioglu]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

did falkens lead you to this idea?  (sorry for mentioning )
 
never trust bmw owners

[D]

Ok allow me...

I have only ever had four different tyres on my Omega, (3.2 Estate with SL and used as a taxi),so in no particular order...

1. Goodyear NCTs, 225/55/16. Predictable wet or dry, but quite soft, lasted 10-12k,  £200 per pair iirc.
2. Durun 225/55/16 97W XL. Crap, wet or dry, lasted 3k, but front geometry was out, £140 per pair.
3. Autogrip F107s 225/55/16 97W XL. Ok in dry, crap in damp, deadly in wet, 10k+ v.durable if car set up properly, £140 per pair.
4. Runway Enduro 916+ 225/55/16 97W XL. Predictable wet or dry, proved good on snow as well. 20k if car set up properly, £140 per pair.

I've a set of MV6 wheels being refurbished, and have ordered Runway Enduro 916+ 235/45/17 95W for them. Can't comment yet, but they are £148 per pair. The same pattern is also available in 235/40/18, and will try them later if the 17"s prove as good (for me) as the 16"s.

Again an interesting subjective assessment. For me if a pair of tyres seemed deadly(after giving it the benefit of scrub in), they would be off my car at the next possible opportunity. Not on for 10k. It doesnt make sense to me? And therefore the above review to me is of little benefit/help! Someone who would run a deadly pair of tyres for 10k isnt me and therefore difficult to correlate with. At least he was honest about it. There are folk who may not disclose things like this in a subjective review. No offence intended to taxi al.

[feeutfo]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

did falkens lead you to this idea?  (sorry for mentioning )
 
never trust bmw owners

...and also my tires will always be different from front to rear, as the rear wheels are 265 wide, with 235 on the front.

[cem_devecioglu]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

did falkens lead you to this idea?  (sorry for mentioning )
 
never trust bmw owners

...and also my tires will always be different from front to rear, as the rear wheels are 265 wide, with 235 on the front.

thats logical

[feeutfo]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

did falkens lead you to this idea?  (sorry for mentioning )
 
never trust bmw owners

...and also my tires will always be different from front to rear, as the rear wheels are 265 wide, with 235 on the front.

thats logical

But you haven't answered my question. Do you not accept a tyre will handle differently on a different chassis?

[05omegav6]

Surely that's a given 

As an example, had a Mk2 2.8i Granada with TRX wheels ran beautifully on Avons, tried Avons on my first Omega, and they were rubbish ok I can't recall which range of tyre that either were, and the Granada tyres were narrower, 195? against 225s...

None taken D , the Autogrips are absolutely not my first choice, I've probably bought 15-20 sets of tyres in the last 3 years, only three have been Autogrips. They make a useful spare because they are unidirectional, whereas the Runways are sided. If you are aware of a tyres short comings then you can drive accordingly what maskes such things dangerous is the first time you become aware of a problem might be your last. Also 10k for me can be as little as 6 weeks... My local tyre supplier generally stock the Runways in this size as their preferred choice for budget tyre, but on occaision they've only had the Autogrips on the shelf so wherever possible I ring the day before to pre order. Branded tyres generally have to be preordered.

[cem_devecioglu]

I would never assess a car that has different tyres on the 2 axles.

So cem's "a coeffient of friction is a set, carved in stone constant" is not valid then?

its valid.. but using different friction sets on rear and front is 

not ideal in this instance, but circumstances dictate and other compromises come into it. Much like life, not a test.

Will nobody accept a tyre handles differently on a Differant chassis?

did falkens lead you to this idea?  (sorry for mentioning )
 
never trust bmw owners

...and also my tires will always be different from front to rear, as the rear wheels are 265 wide, with 235 on the front.

thats logical

But you haven't answered my question. Do you not accept a tyre will handle differently on a different chassis?

a different chasis will effect friction if it changes the surface area of tyre touching asphalt by suspension.. 
 
by default, you expect it to be unchanged.. but my experiences showed me that old cars have serious deviations..
 
plus we are generally talking about normal/good road conditions.. if road is bumpy and suspension system is unhealthy you will get nearly 0 friction which will cancel a good tyres properties..

[feeutfo]

They have to, or all tyres would handle be exactly the same, and all cars would handle exactly the same. This is clearly not the case. Therefor a tyre test on a car other than an omega is not relevant.

But only not relevant beyond the parameters of that particular test.