I'm in the middle of this (3x9 → 1X9, Shimano Sora road groupset) and I've decided to use the middle ring of a triple, with said ring shifted to the other side of the spider for reasons that escape me now.
I'm basing it mainly on this: http://www.bikeradar.com/gear/article/workshop-how-to-convert-your-mountain-bike-to-1x9-or-2x9-gearing-29342/
Won't bother with any chain retention stuff unless it starts dropping
@fizzy.bleach started
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I'm in the middle of this (3x9 → 1X9, Shimano Sora road groupset) and I've decided to use the middle ring of a triple, with said ring shifted to the other side of the spider for reasons that escape me now.
I'm basing it mainly on this: http://www.bikeradar.com/gear/article/workshop-how-to-convert-your-mountain-bike-to-1x9-or-2x9-gearing-29342/
Won't bother with any chain retention stuff unless it starts dropping