I have a set. I tried to email to author and I guess nothing happened. I dont think these
have been mounted. they are 170s set up as a double with a grease guard and I think
you could take that off and mount a third chainring on the outside position.
call me if you are interested and we can converse.
I have some other gear which needs to go as well.
thanks
bo in Bellingham
I can of course to photos