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Speedos 1:1 2:1 ?:1

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  • Speedos 1:1 2:1 ?:1

    Went for a ride today to do a speedo check. With my brother along side providing a reference (stock factory bike), my 45 solo speedo registered 15mph to my brother's 30mph.
    35mph to his 50mph.

    My speedo, drive gear and cable are all new reproduction.

    Since this doesn't appear to be a linear 1:1 vs 2:1 issue, where should I look for the problem?

    I'll take out the head and see if I can find a ratio marking.
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