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[Cicli]

A longer hanger will move the derailuer down to clear a larger rear cog. So, if your max out back is a 28 on account of the top jockey pully hitting the inside cog, moving it down with a longer hanger may let you run a 32 or 34. Keep in mind, a short derailuer cage may still not hold all the chain needed to run a 12-34 with a compact or triple up front.

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[smontanaro]

Even in pre-replaceable hanger days, all dropouts were not created equal. I have an '81 Schwinn Super Sport frame awaiting it's turn at the front of the build line. It has SunTour GS dropouts, which by my crude measure have about a 4mm longer hanger than the Campy 1010-style dropouts (and probably SunTour GT) than I'm used to. I'll be building it up with a SunTour Superbe derailleur, and hopefully coaxing a bit larger rear cog than usual out of it. Heck, if I get adventurous, I might see if I can swap in the pulley cage from a Cyclone GT derailleur. :D

[zank]

I've found there's very often interference between the QR nut and the derailleur knuckle during wheel installation and removal when using the short hanger. I spec the long 7075.

[Tim Porter]

Yes, my Jaegher has the affliction that Mike mentions due to a short hanger. With Campy QRs, the diameter of the nut is such that it has to be taken of the skewer in order to mount a wheel. I think they have fixed the problem on subsequent bikes. Luckily not racing that bike! Tim