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Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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I totally agree with both their suggestions! Chain stay length is so fashion and not function directed. Put back in that 10mm longer amount and after looking at the tire clearances consider another 5-10mms of length. I might have split the 50mm of stem spacer length that you added to the head tube. Maybe 30+ onto the HT and 20- of spacer? Is the fork length (A-C) the same as with the Mag 21's (and that's not the dimension given on the drawing)?
Maybe give us more info? Tires, crankset, Stem/bars WRT the seat, Seat height/setback. No mention yet of Top Tube length. Andy
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AndrewRStewart