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Thread: new tyres

  1. #1

    new tyres

    Just reshod the Prado with a full set of Cooper LT225s; had run the others down to (?below?) the legal depth.
    Now have to drop back a cog on rises I use to get over in top!
    Tread depth 137mm.
    Think the petrol consumption figures might look good for a while, most of the driving is on the flat.

  2. #2

    Re: new tyres

    Check your soeedo against a gps sounds like you have radically altered your gearing.and will have to adjust your driving habits and drive by your taco.
    Cheers
    Ray

  3. #3

    Re: new tyres

    Coopers have deeper tread than factory stock tyres, so overall circumference is different for same size, especially in LT sizes!

  4. #4

    Re: new tyres

    Quote Originally Posted by littlejim View Post
    Just reshod the Prado with a full set of Cooper LT225s; had run the others down to (?below?) the legal depth.
    Now have to drop back a cog on rises I use to get over in top!
    Tread depth 137mm.
    Think the petrol consumption figures might look good for a while, most of the driving is on the flat.
    Don't be surprised if the extra tyre diameter actually increases your consumption. Going up one profile in the Nissan Patrol I had made the speedo accurate (at worst a 5% error prior) but also cut the range from the tank from 1100 km to 1000.

  5. #5

    Re: new tyres

    Followed Ray's advice and put the GPS on for a while.
    Looks like where I had a speedo fudge factor of about 5-6K at 100, it is now only a couple of K, and at the lower speeds it is virtually spot on, instead of under-reading a bit.
    Have just done a trip to the coast and back, with a petrol top up on the way back, looks like a 1.4MPG (I'm an old fart) improvement on previous trips.
    Note Scottar's comments, but the trip to and from the coast is mainly flat with a drop down the escarpment on the way down and a short sharp uphill bit on the way back.
    Plus there is now a long 80K* section in the middle which must help consumption figures.
    * was 100K before they did the road up????? An earlier bit was 100K when dirt, now 80K after being converted to wide bitumen with radiussed curves????

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