My Quickbeam, & I think yours too, will handle a 10T gear difference. When I was choosing my gearing I started with the fixed gear we used back in The Day, a 42X16T gear (45X17T is the same gear inches). (We used this because nearly everyone had 42/52or53 rings, and a 16T cog gave a 70 inch gear. This was big enough to give us some relatively gentle aerobic workout and allowed us to use occasional big rpm spins that we supposed to be good for 'suppless.') What I ended up with, to get as much gear spread as possible out of the 10T difference built into the Quickbeam, was 39/45 chainrings, then 17-19/21T flip/flop on my free wheel, and a 17-21/23T flip/flop. The 17-19T cog is a White Industries Duo, and the 17-21T cog is a Surly Dingle. The 21T freecog was the largest I could find. So with my free wheel on 28mm tires I have gears of 70-63-55-50. On my fixed wheel 70-61-57-50-45 http://www.flickr.com/photos/79695460@N00/2760281945/in/set-72157607471577085 I don't care where my rear wheel is in the dropouts as long as it IS fully in the dropouts, the chain is snug, and the wheel is centered in the chainstays.
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