How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 21614
Experience:  BEng hons Mech engineering, in auto industry 22 years
Type Your BMW Question Here...
Matt is online now

I go skiing Switzerland and drive on snowy roads often. It

Resolved Question:

I go skiing Switzerland and drive on snowy roads often. It is the rule
there to have winter tyres and summer tyres.
I used to have an old heavy BMW X5, and I used it a lot in the snow. It was very steady.
Last year I bought a BMW X5 M50d.
The garage who sold me the car gave me a set of wheels with summer tyres on,
and a set of wheels with winter tyres on.
The winter set they gave me are 255/50 R19,
The summer set of wheels and tyres are 315/35 R20 (rear) and 275/40 R20 (front)
The car was terrible in the snow on the 255/50 R19
I now approach the time to put on the winter tyres again. I understand that
the weight pressing on the snow will be heavier on the narrower tyres, but
that I will get more friction with the wider set of tyres.
Which wheels should I fit new winter tyres to?
Is the problem actually my driving as I notice the torque on the new X5 in first gear is much higher (50% more) than the old X5?
Finally, if it is the torque, I would ideally like to pull away in 3rd gear, but trying this today, the car stops me using 3rd as a 'pull-away' gear. Can I turn this off?
Submitted: 9 months ago.
Category: BMW
Expert:  Shantal-Mod replied 9 months ago.
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.
Please let me know if you wish to continue waiting or if you would like for us to close your question?
Thank you,
Customer: replied 9 months ago.
I would like the answer pleasethanks
Expert:  Matt replied 9 months ago.


in all snow conditions you will be better off with a narrower tyre than normal as this has more bite into the snow , look at rally cars on full snow you'll see they run a very narrow tyre there

I'd say the extra torque certainly will make it more difficult to move off and your strategy of pulling away in 3rd is a good idea and try pressing the DSC button once to disable it in snow as this should then allow some wheelspin and allow you to move

Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 21614
Experience: BEng hons Mech engineering, in auto industry 22 years
Matt and other BMW Specialists are ready to help you

Related BMW Questions