Does anyone know why the new plug is so much cheaper than the old one?
Is it not as well built?
Because it was obscenely overpriced in the first place, and because their costs and what they can get away with charging have both probably come down.
My questions:
Is this a totally mad idea?
*** imo no, not in the slightest. I think tilover built up a 3-speed on a track frame - but I can't remember if it was fixed 3-speed. Maybe drop him a PM.**
Will the use of a torsion bar with a track end dropout be more trouble than it's worth?
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do you mean the brake arm for a coaster brake? If so it will be fine. Road dropouts are always going to be easier for wheel changes, but trackends aren't the end of the world.
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Are the Sturmey drum brakes canti or v pull? I read canti but that they take a lot of pull. Could I use my Avid SD levers with drums?
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No idea, but I'd use caliper brakes over drums. Plus you've already got the rear drilled. Add some nice neatly lined up cable clips, and it will look nice.
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Because it was obscenely overpriced in the first place, and because their costs and what they can get away with charging have both probably come down.