Assuming you are using MTB cassettes...
1. Max gear range, nice shift ratios in front for double shift, but all the little problems of a triple (22-32-42, 11-32)
2. Lose a top gear, front shift becomes very large but less often used, maybe a clutch in the derailleur (24-38, 11-34)
3. Lose two more gears, never worry about front shifting again, possibly limited chain ring life (10-42, front ring your choice)
they each get get a little lighter but that's probably not a big worry on a Surly
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."
Last edited by Darth Lefty; 05-06-16 at 08:35 PM.