Originally Posted by
91MF
having dt bosses and a der hanger on a singlespeed converted bike doesnt bother me in the least.
its a conversion, to me this means the bike is used alot and simplicity and ease of maintenance are key. adding crap to cover up the fact that the bike had gears once seems silly to me.
here is mine with exposed dt bosses and a visible der hanger. the horror.

I'm not concerned about them appearing ugly. The only thing I'd want to cover for certain are the downtube bosses - I'm trying to eliminate sharp edges that might scratch. The other stuff is extra. Since they're there already, I'd rather put them to use, but I have no issue with leaving a derailleur hanger empty on a conversion either.