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@k0vic
check / google "rabbit gear" and all your skid patch worries will be over. Just checked it and it's 3 skiddy holes not 2 for the 18t with the 48t up front(aren't I just a fountain of almost truths today)
The no. of skid patches comes from how the front to back cog teeth ratio can be simplified, so by putting a cog with a prime number of teeth on you will be getting that number of skid patches (i a nutshell)