16 to 28 is a huge jump. It might not work exactly as you have planned. Sometimes adding a washer is helpful between the derailleur and the frame to both keep the mech out of the spokes and get the geometry right for a big rear cog. When you say "eating the chain" do you mean chain suck, or...? Length of chain shouldn't have an impact here unless you have zero tension on it.
You will want to keep up the maintence on those drum hubs and make sure you are using the right kind of grease. Drum and coaster hubs have specific lube requirements. Love the bottle dyno.
I know. It's going to be interesting to see if it works or not. But the washer is a good idea. Otherwise I'll have to figure out if I can grind down some of the sprockets for a third cog in between.
As to the "eating the chain", it fell off and wrapped itself around the rear axle. The chain itself hasn't been shortened yet so it's probably a lack of tension. Just slapped on the 114 link chain to see if it worked. Probably fell off when I hit a big bump. I'll wait until the big sprocket comes in to shorten it.
I'm aware of the special needs of Shimano's roller brakes. Really good brakes but you need a special grease to increase their stopping power.
The Sturmey Archer brake hubs don't need any grease as far as I can tell.
Just keep them clean and grease the pawls and springs inside. They also have the added benefit of having basically no drag when you are riding because the brake shoe completely disengages.
I'm planning on putting some modern, but good-looking, lights on there. Probably a silver
B+M Cyo (60 lux) with a
Secula Plus in the rear. Similar to what I have on my current bike. Though a silver
B+M IQ-X would probably fit as well and 100 lux from a dynamo light is amazing.
The current dynamo is a 12V 6W, so I'll have to check if that plays nice with modern LEDs which are designed for 3W.
The best looking dynamo I've found so far is the
Velogical rim dynamo but those are in the price/quality range of SON dynohubs... Maybe in the future.
Just made an
album on IMGur so I can easily refer to all the pictures if anyone is interested.