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R.Angus

G30 520d XDrive - Tyre selection

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Technical question on a new G30 xDrive. I opted for the xDrive on my new 520d as I live in the north of Scotland and snow/ rain are obviously a common occurrence. I previously ran an '06 325i SE which was rear wheel drive and I ran the car all year round with Vredistein Wintrac extreme winter tyres . They were a real good tyre wore exceptionally well and were good even in summer time dispersing rainwater after a summer deluge. The tyres on my 5 series are Michelin Primacy 3's, which are a highly acclaimed summer tyre, but I'm thinking of fitting a set of all season tyres as I think they will be a good compromise. When asking dealer about tyre options they said it was a matter for a tyre fitter to recommend tyres baised on a new star rating system. Does anyone have any knowledge on this subject or have a recommendation for a tyre?

Also on the subject of tyres - the tyres I ran on my 325i were not run flats and they didn't bother it at all. Does anyone have any info on this matter as have heard a lot of BMW owners looking a going away from run flats due to cost.

 

I have been advised that the electronic nature of the xDrive system makes it sensitive to tyre choice ?

 

Thoughts anyone?

 

cheers.

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On 20/03/2017 at 5:23 PM, R.Angus said:

Also on the subject of tyres - the tyres I ran on my 325i were not run flats and they didn't bother it at all. Does anyone have any info on this matter as have heard a lot of BMW owners looking a going away from run flats due to cost.

 

I have been advised that the electronic nature of the xDrive system makes it sensitive to tyre choice ?

 

Thoughts anyone?

I can't see how the xDrive could make the car any more sensitive to tyre choice than 2wd would?

 

I've been running 19" Michelin Pilot Supersports on my F10 for the last 12k miles and the difference between them and the OEM Michelin Primacy run-flats is profound. Ride comfort, steering feel, road noise, and grip are all improved - but the biggest difference is how the tyres feel from cold. The run-flats were truly awful. They followed every defect in the road surface and the car felt really nervous until they had some heat in them. 

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What size tyres? Im still on my michelin crossclimates and they have transformed the car into the quiet smooth barge the f10 was meant to be.

Only annoyance is there isnt a 275 width crossclimate option so now its warmed up will be adding supersports on the rear staggered msport rims.

Sent from my SM-G930F using Tapatalk

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I am a believer in winter tyres, and got some 17's 225's run-flats P7's for my wife X1 X drive.  She know her route to work, and never lost traction, during the winter.  When I drove it, they were not as sharp into corners until about 2 mile had passed under the wheels.  I only felt any tram lining when the tyres were warming on the front inside edge but twice a year I got the wheels aligned.  I have just come to BMW from a Merc and I was well impressed with my Nokian Weatherproof.  I have yet to try these on my G31.

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A 4wd system is very susceptible to poor tyre choice, by its very nature as both front and rear axles are connected mechanically. It will be far more critical to maintain even rolling radii on all four tyres.  A front axle rotational speed of less than the rear axle may upset some of the systems that use wheel speed as inputs, such as transmission, abs and traction control systems.

 

Years ago with less sophisticated 4x4 systems (ones without a fully open mechanical differential) such as that fitted to Sierras and Calibras, were notorious for faults if incorrect sized or grossly worn tyres were run on on axle compared to the other axle. It would stress up the centre diff which had a viscous coupling. A proper old skool Landrover Defender with its fully open centre diff wouldn't have this issue.

 

The BMW systems may be smart enough to fully disconnect the front prop shaft at the transfer box so that it isn't a problem, but I don't know the make up of the new BMW transfer box, it certainly won't have a fully open centre diff, there will be some form of electronic torque control between the two axles.

 

As long as you stick to BMW approved Tyre sizes you should be fine.

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