I was looking at the specs on the '11 Flash Carbon 29er 1 and noticed the the Lefty is 90mm. I have a '10 Flash Alloy 29er 1 frame with an '08 alloy DLR 80mm that's been upgraded to Solo Air. Knowing that the 29 version of the Lefty is a reduced travel 110mm, would increasing travel to 90mm work with the '10 Flash. Cannondale's archive website doesn't have geometry information available anymore to compare against the '11 Flash 29 geometry.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Lefty 29 80mm to 90mm