Originally Posted by
fietsbob
Seeing a SRAM 11x1 MTB drivetrain, in the catalog, a odd double could result
since the high added to a normal 9 gear set is 10 on one side , and a 42 after the 34
so 50:10, and a 34 :42 might be possible , just be sitting down when asking; How Much?
The guy from the LBS is right for practical purposes in that with a 10 speed 11/36 cassette and a mountain double with 40/28 rings you can get a range of 98" to 21" which is an excellent touring range. I've used a 42/26 with an 11/34 cassette for a long time and get 103" to 21".
I've never seen the need for high gearing on a touring bike and you should design your gearing give the gear inches you ride most of the time with the least amount of chain angle. I far prefer to ride a double than a triple and I've found that gearing becomes less and less of a concern the more you tour. I currently tour on a 50/34 with an 12/25 cassette and love it. Go with a double.