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Bike Gallery / Re: Fixed gear bikes/ Post your big bikes V2
« on: March 22, 2015, 11:31:01 AM »
Lower back pain leads me to believe the saddle is too high. Saddles themselves will have different height between the top and the rails, so swapping saddles without moving your seatpost could change the effective height. Try bringing it down a few mm. Next time, measure from the top of the saddle to the top tube before swapping, then match that number after installing the new saddle.