Bike Forums - View Single Post - What is the actual effect of IGH on speed?

03-23-16 | 09:08 AM

#81

FBinNY

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Joined: Apr 2009

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by noglider

How feasible would it be to have a sun gear and planet gears custom made to adjust a hub's ratios? I know some machinists.

Not very. Not only do you need to cut the various gears, but you'd need to replace the planet cage since the center of the planets will change. Basically, you're building an entirely new hub. It would be easier to seek out an older or vintage hub.

Easier to find are older 5s hubs, which have the central 3 gears closer spaced than the classic AW. If you can find (and afford) a vintage hub there's the AM (looking for one myself) and the ultra close AC.

FWIW it's the AM's ratios of 87/100/116 that I'm suggesting are about right for GP urban/flat riders, vs. the typical 75/100/133 of most 3s hubs.

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