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Home > General > MY11 SD4 GS vs MY15 Metropolis |
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pporocki Member Since: 30 Apr 2011 Location: PL Posts: 100 |
What tires do you have fitted in MY11 SD4 GS?
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6th May 2015 9:55 am |
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Stuartc Member Since: 01 Dec 2014 Location: Perth, Australia Posts: 2292 |
I'm finding both the engine and tyres very quiet and I've come from a petrol! Only time I notice the engine is on cold mornings. Normal operating temperature quiet and refined at any rpm. Only noise at speed is wing mirrors unless I've got roof bars in place.
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6th May 2015 10:07 am |
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decho Member Since: 10 Mar 2011 Location: Fife Posts: 113 |
Yes that's what I had/have on both except the Metropolis has 19 inch. Continental are very noisy except on very smooth tarred road. |
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6th May 2015 11:01 am |
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paxman Member Since: 12 Apr 2015 Location: Northumberland Posts: 243 |
When the dealer replaced my 2 front tyres and I paid for the rear 2; I wanted to fit the Michelin Latitude Tour HP but they declined saying Michelin tyres aren't OE recommended.
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6th May 2015 11:22 am |
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Stuartc Member Since: 01 Dec 2014 Location: Perth, Australia Posts: 2292 |
If you want to compare apples with apples you should compare tyres of identicle width/aspect ratio.
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6th May 2015 12:07 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
Sorry to be pedantic but the contact patch will be the same regardless of tyre width. If your car weighs a certain amount say x pounds and the pressures are say 30psi then you need x/30 sq inches of contact area to hold the car up regardless of tyre width. I agree with the rest of what you say. 3 x FL1 2 manual + 1 auto
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6th May 2015 2:14 pm |
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Stuartc Member Since: 01 Dec 2014 Location: Perth, Australia Posts: 2292 |
In short "no"!
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6th May 2015 2:42 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
I am looking at the basic physics here and not allowing for sidewall deflection etc but the total force exerted by the air in the (static) tyre pushing on the ground through the tyre must equal the weight of the vehicle so vehicle weight is tyre pressure times contact area.
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6th May 2015 2:54 pm |
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Dartman the one Member Since: 04 Apr 2013 Location: Seville, Spain Posts: 1689 |
The ground contact of a 235 tyre is constant, what changes in the profile is the amount of air. the air is compressible, the side wall is flexible, the lower the profile the less flex, the less air, there is less tyre compressibility for the same load hence a harder ride. my PC is slightly to the right of Genghis
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6th May 2015 2:56 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
The argument here is simply that for a given vehicle weight and tyre pressure the (static) contact patch size is constant regardless of tyre geometry. This ignores the secondary effect of sidewall flexibility and other dynamic effects etc 3 x FL1 2 manual + 1 auto
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6th May 2015 3:06 pm |
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paxman Member Since: 12 Apr 2015 Location: Northumberland Posts: 243 |
Can you define what is "higher perfomance"? Do you mean for higher speed exceeding 70 MPH? Surely the Michelin Latitude Tour HP can handle at these speeds as well as the day to day going about. If the tyres can give you a comfort ride, good fuel and low noise I will choose them. |
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6th May 2015 4:46 pm |
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decho Member Since: 10 Mar 2011 Location: Fife Posts: 113 |
Actually the tyre noise is what bothers me least because I can explain it away.
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6th May 2015 6:55 pm |
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Wireworld Member Since: 17 Feb 2011 Location: Shropshire Posts: 65 |
Strangely I have a similar experience. My 2015my metropolis with 4,000 miles subjectively isn't as smooth to drive as my 2013 HSE Lux was. Especially the gearbox and engine appear less smooth. |
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6th May 2015 9:20 pm |
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pporocki Member Since: 30 Apr 2011 Location: PL Posts: 100 |
I've just compared my both cars MY11 TD4 manual and MY14 Si4 Auto once again, one after one, on the same road in the same conditions, on the same surface. Old one's mileage is 45.000kms and new one's mileage is 1000kms.
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6th May 2015 11:15 pm |
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