I got lucky with my stumpjumper SS/Fixie. The 44/16 works out perfectly, no tensioner. But as I said, I got lucky. There are a few web sites that have tools to find a gearing that works. I have them saved at home but not here at work. You just need to measure the chainstay.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC