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I have a Viper STX with a 4 1/2" drum/sprocket and want to upgrade the brakes to disk (see image). I'm thinking in this option (with the right hub)...

Hi everyone! I'm new in this forum and I need your help. I built a Viper STX using the MXK.COM plan. It is single drive with a sprocket/drum brake, so only one tyre brakes and it is a real safety issue. I use the go kart in the back yard and driveway. In the grass the traction is terrible...