If your buddy isn't going to upgrade the drivetrain then he will probably stick with the original tires and want to burn them up. As long as they don't hook up and spin you will be relatively safe. But if they ever catch hold the rest of the drivetrain will let go. You don't want to be around. I wouldn't want to be riding with him when that happens. You already know what will happen but he probably won't see any warning signs until it is too late.
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