At speeds under 65mph, I prefer the breeze, and earplugs take care of the noise.
For those who've added a windshield, is it for noise reduction, protection from cold/rain, or another reason?
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I agree, under 50-60mph it's not needed for me. I don't have one on my Racing King 180 but normally ride in town or near and don't get over 50mph. Having one on my 650 Burgman is a must as I usually cruise around 70-75 and it keeps the bugs and other nasty stuff of my helmet and jacket. And the rs100 would just not look cool without it's little swept back shield. Windshields also keep lots of dirt and grime off your face and clothes. Lots of older people here in Taiwan have shields on their bikes and all the others just ride with their jackets on backwards.