My current primary commuter (spring, summer, fall) is a Kona Sutra touring/road bike but I only got that in the fall of last year; prior to that, I had urbanized my KHS Tempe 29er with narrower, slicker tires, racks, panniers, lights and fenders. On the 29er, I rode two metric centuries (back to back) and did it fine but this year, I'm going to use my Kona or my old Bianchi road bike (that needs more tuning). My 29er has been returned to its MTB form with knobby tires, seatpost rack, no fenders or lights. For next year's winter commutes, I'll be using my old Norco Bigfoot MTB that has racks, lights, fenders and I'm just making some DIY studded tires (both wheels need spoke work so this bike wasn't used this winter).