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  1. #1
    Team NZH: Order of Merit STina's Avatar
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    Flat spotting tyres - School me

    As above I want to know about flat spotted tyres.

    Is it a major problem? What does it feel like when driving on them? how does it effect the car?

    How can you tell if a tyre is flat spotted (aside from canvas showing through).

    Basically on the market for some new semi's, everything on trademe seems to be flat spotted just wondering if its worth the risk or I should bite the bullet and purchase new and then flat spot them myself

    Please no "i read on the internet/my cousin is part of TZR and he told me this"

    Thanks
    Basic B-series EG that does more laps than most race cars

  2. #2
    8,000rpm (B Series Redline!) kiwi pauly's Avatar
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    Re: Flat spotting tyres - School me

    A really bad flatspotted tire will induce vibration, a not so bad, not so much.. the problem is, once it starts, it has a tendency to grab that spot all the time... think of nice and round vs flat, the flat spot will catch due to a higher rolling resistance, so will continue to get worse and worse.
    I've locked my clubsport semis hundreds of times on and continue to use with no worries, but the risk if running a tire cause of that one spot is greater.
    If you can seriously see the flat - I would stay away, if its just someone being paranoid and all you can see is a scuff, if its cheap, will do you fine.
    " Do not think yourself more clever than anybody else, for this will lead you into many a troublesome mistake." http://www.acjs.co.nz

  3. #3
    6,000rpm (Max Torque)
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    Re: Flat spotting tyres - School me

    /sidetrack comment

    Semi's get harder when you heat cycle them and over time in my experience. So if you're ok with that, then go second hand, but if you're being quite serious about going faster, there's few things as nice as using nice new soft tyres :-). This applies more to sprints/hillclimbs, and less to doing many circuits of a racetrack (where you will want harder compound tyres anyway).

  4. #4
    Team NZH: Order of Merit STina's Avatar
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    Re: Flat spotting tyres - School me

    Quote Originally Posted by Leon View Post
    This applies more to sprints/hillclimbs, and less to doing many circuits of a racetrack (where you will want harder compound tyres anyway).
    have done neither sprints or hill climbs but a few trac days so this is where they will be used.

    Thanks for your thoughts Paul & Leon

    Any tips about spotting flat spots? or is it done by feel when driving?
    Basic B-series EG that does more laps than most race cars

  5. #5
    19,000rpm+ Honda F1! DrRubber's Avatar
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    Re: Flat spotting tyres - School me

    By feel when driving yes....but you will best notice by jacking car up and spinning the wheel and observing the contact patch as it were.

    Or better yet spin up on balancer.

    A quick burnout sorts flat spots

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