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ThePeginator
I ran a magic gear on one of my frames for a while. I used the same link that you posted to work out the gearing. I had to run it with a BMX half link chain to get the gear to work and I was totally happy with it. Two things to check are
1) that the chain is long enough if you go half link
2) that you are happy with the available gear ratio - I think my only choice was 48 / 18
Looked like this (ignore the bars - they were swapped for risers immediately afterwards)