I’ve psyched myself up looking forward to the first ride on the refurbed city beater sporting its shiny NuVinci hub but it looks like I’ll have to satisfy myself with visualization exercises a little longer.
The idea was to give the old horse a new lease on life and get some experience with the NuVinci by ditching the spastic derailleurs. Besides fewer knees smashing into the steering stem due to spontaneously shifting gears, I liked the idea of fewer components and cables to maintain. The only caveat? The old Giant ATX770 frame has vertical dropouts, not the horizontal type for which the NuVinci was designed. To the rescue were little idler pulleys like this
that are designed to maintain chain tension in exactly this type of situation. The NuVinci introduces an unfortunate complication in that the rear pulley housing demands real estate already occupied by the idler pulley.
The picture makes it look like a little grinding might do the trick but what you see there is just the nut, the actual housing takes up another 6mm or so radially. Could this be the end of the line for the old steel frame as it’s cast aside in favor of a nifty aluminum number with dropouts pointing the right direction? Or will it soldier on with a new set of derailleurs lifted from the bottom of the closeout bin? Watch the craigslist classifieds for the exciting conclusion!