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Thread: Defender bonnet tyre mount

  1. 19th October 2021, 07:55 PM #21
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    Probably works as a vortex generator and allows the air coming over the top of the bonnet to break away and go over the roof and off to the sides rather than going full tilt against the windscreen.
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  2. 19th October 2021, 08:31 PM #22
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    Quote Originally Posted by pop058 View Post
    Directing the wind past the ( round) tyre as opposed to hitting the block of flats head on ??
    Quote Originally Posted by JDNSW View Post
    Probably works as a vortex generator and allows the air coming over the top of the bonnet to break away and go over the roof and off to the sides rather than going full tilt against the windscreen.
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  3. 19th October 2021, 09:10 PM #23
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    Does anyone have a pic of the plate that goes on the top of the spare wheel mount? My stage 1 has this same mount but has no top plate. I have the bolts but that's all. Cheers
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  4. 19th October 2021, 10:39 PM #24
    rovers4
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    Quote Originally Posted by W&KO View Post
    Im guessing your 110 is a ute?
    Nup. 110 Wagon, with a Dolphin logo on each side, just in front of the front doors.
    Spare is currently on rear door. Only use bonnet mount for 2nd if going remote.
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  5. 19th October 2021, 11:12 PM #25
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    Quote Originally Posted by 67hardtop View Post
    Does anyone have a pic of the plate that goes on the top of the spare wheel mount? My stage 1 has this same mount but has no top plate. I have the bolts but that's all. Cheers
    I made the one I have. Just a piece of thick alloy U channel with locators and holes.
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  6. 19th October 2021, 11:39 PM #26
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    s-l1600.jpg



    s-l16002.jpg


    is whats on mine

    available on ebay etc
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  7. 20th October 2021, 05:01 AM #27
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    Quote Originally Posted by rovers4 View Post
    Nup. 110 Wagon, with a Dolphin logo on each side, just in front of the front doors.
    Spare is currently on rear door. Only use bonnet mount for 2nd if going remote.
    Are, so not factory…..
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  8. 20th October 2021, 05:11 AM #28
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    Quote Originally Posted by JDNSW View Post
    Probably works as a vortex generator and allows the air coming over the top of the bonnet to break away and go over the roof and off to the sides rather than going full tilt against the windscreen.
    Yes, I think you are right.

    Without the tyre mounted the wind screen washer water goes up and out to the sides in a smooth pattern and hence in the full sweep of the wiper blades.

    With the tyre mounted, the water is pulled towards the centre and slightly downwards with an oscillating/turbulent pattern of movement on the wind screen on both water jets and hence slightly towards the outside sweep area of the wiper blades.

    235/85 16 Bridgestone muddies tyre. When I ran the old 7.50/16 Dunlops they were a skinnier tyre and thus slightly flatter on the bonnet, the pattern if I recall was slight taller up the window but still pulled towards the centre.
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  9. 21st October 2021, 10:25 PM #29
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    Quote Originally Posted by incisor View Post
    s-l1600.jpg



    s-l16002.jpg


    is whats on mine

    available on ebay etc
    Ordered today and paid for. Don't like buying of this particular seller but needs must.
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  10. 22nd October 2021, 02:13 PM #30
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    Quote Originally Posted by windsock View Post
    Yes, I think you are right.

    Without the tyre mounted the wind screen washer water goes up and out to the sides in a smooth pattern and hence in the full sweep of the wiper blades.

    With the tyre mounted, the water is pulled towards the centre and slightly downwards with an oscillating/turbulent pattern of movement on the wind screen on both water jets and hence slightly towards the outside sweep area of the wiper blades.

    235/85 16 Bridgestone muddies tyre. When I ran the old 7.50/16 Dunlops they were a skinnier tyre and thus slightly flatter on the bonnet, the pattern if I recall was slight taller up the window but still pulled towards the centre.
    A study tested it in a wind tunnel, the result was an improved cd with tyre on bonnet.

    Study link here:

    Wheel on Bonnet = Aerodynamic improvement
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