On Tue, 14 Apr 2015 19:16:04 -0400, Frank Krygowski
wrote:

I remember Jobst claiming that if you used slick tires, you don't need
fenders; that it's the tire tread that slings stuff around.

I still doubt that. I still like fenders on (almost) every bike,
slicks or no.

Yep, slicks throw stuff around just fine- but not as effectively as
tires with tread.