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Here's a magic gear generator: http://eehouse.org/fixin/formfmu.php
48x15 and 50x17 seem to be the other 2 magic gears besides 52x19. I wouldn't think 46x13 is a gear anyone would wanna run, but is also possible.
Jaap
I have a regular vertical dropout frame I'm considering single speed-ing. It would be nice to avoid a chain tensioner if I can find a magic gear that works. Firstly, do 'magic gears' generally work ok? Or are they usually a bit crap due to iffy chain tension or chain stretch over time? or other issues I've not foreseen?
Frame has chain stays of 430mm, I've popped it in on eehouse. I just want some advice before I buy any chainrings/cogs etc.
From experience will any of the gears within the purple strip in the middle of the chart work, or am I best sticking only to the ones bang in the middle? I presume the ones closer to the centre will be the best fit in terms of chain tension?
52x19 is looking like a decent option at the moment, particularly as it doesn't require a half link chain.
Or is it just better/easier to use a tensioner?