Joined: Oct 2011
Posts: 354
Likes: 0
From: South Brooklyn, NYC
Bikes: '80 Trek 710, '81 Trek 613, '82 Trek 613, '86 Trek 500, '87 Bridgestone MB2, '87 Specialized Rockhopper, '87 Schwinn Circuit, '88 Miyata 712, '89 Trek 400, '97 Trek 6000, '11 Trek Utopia, '13 Specialized Allez Race, '15 All City Macho Man
If the saddle isn't good on the FX you can always swap it with the one of your 7100. I've never rode an FX but I own 3 Treks and have been extremely haoppy with them. Never really looked at GT so I can't say anything about them.