A couple years ago, I test-rode a bike with a Hebie Chainglider on a visit to NYC (a VanMoof, at Rolling Orange in Brooklyn). I was really impressed by the lack of drag and noise.

So, I bought one (the 44-tooth model). Now I'm trying to make it work on a 1984 Motobecane mixte with a 44t chainring and a Sturmey-Archer AW hub in the back. The Chainglider is rated for a 19- or 20-tooth rear cog; the Sturmey has dished 20t cog. But it really doesn't fit in the rear -- the drag is huge. Like, unusably huge. I'm not sure what I'm doing wrong.

I've read that the Chainglider works better with a flat cog than with a dished cog, but I can't really change the dished cog without screwing up the chainline -- the chainring is already as far left as it can possibly be without hitting the frame, and the dished cog is out in its rightmost position.

Any tips on how to modify the Chainglider to make it fit?

Also: do you put extra oil on your chain in the Chainglider? I put on a new chain and figured that the factory lubrication is better than what I'd add to it. But does it need more lubricant on the outside of the chain?

Thanks!