I am looking at the Trek FX line, particularly the FX3. Is there a real reason to get disc brakes if I never ride in the rain? The disc brakes cost $130 and add 1.5 pounds to the bike (it's the weight that really bugs me). Strangely, according to Trek, the FX2 disc and FX3 disc weigh the same, even though the FX3 has a carbon fiber fork.