I'm in the same boat (or bike?) as Casrider. My commuter is also my weekend ride bike. I have a NiteRider classic with extenral battery pack that I used also on my mountain bike. It's just heavy and it's annoying putting it on and off every few days. I was looking into the cygolite MilIon 150 or 200 (http://www.cygolite.com/products/new...milion200.html) but they are new and I haven't heard much about them yet. Anyone else? The EagleTac flashlight solution looks interesting too though I hate kludgy solutions. (and I have a feeling I'd kludge that on...)