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Old 07-15-06, 09:18 PM   #1
Tom2slow
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so is it possible?

Couldn't you use a multiple chain ring with a internal hub? One of a rear derailleur's functions is to take up the slack in the chain to compensate for different sized gears. Couldn't a derailleur be used in this application?
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Old 07-15-06, 09:46 PM   #2
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yes you can.

in fact, with the SRAM dual drive system, you can even have an internally geared three speed hub, a 7 speed cassette, AND a triple chainring all at once and get 63 gears all on the same bike. the only real utility for this would be to have a super super easy gear, or a super super hard gear. i think the gears in between would be so close that it wouldn't matter. which is why the dual drive system is usually paired with a 33T front ring.

same thing with 3 rings in front and in internal hub. there isn't much utility in combining the two. the whol point of the internal hub these days is to make the drivetrain less copmlex, and have less maintenance. adding both front and rear derailleurs would pretty much defeat that purpose. and most internal hubs are geared wider than most triples.
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Old 07-15-06, 10:00 PM   #3
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Cool, I am looking at doing this for a winter commuter and with my commute being part thru a state park where I know there will be deep snow, and part with some hills that make me spin during the summer I am looking to have a big gearing span. My thinking in using the internal was to limit getting stuck in what ever gear I was in when the rear derailleur decided to freeze in place.
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Old 07-16-06, 01:08 PM   #4
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Quote:
Originally Posted by Tom2slow
Cool, I am looking at doing this for a winter commuter and with my commute being part thru a state park where I know there will be deep snow, and part with some hills that make me spin during the summer I am looking to have a big gearing span. My thinking in using the internal was to limit getting stuck in what ever gear I was in when the rear derailleur decided to freeze in place.
What are you planning to use for brakes? When the weather gets cold enough, you can freeze a thin layer of ice on your rims making rim brakes utterly useless.
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Old 07-16-06, 05:36 PM   #5
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In the 1950s and 1960s Cyclo made a really slick hybrid drivetrain conversion kit, which added multilpe cogs and a rear derailleur to a Sturmey-Archer epicyclic hub. My favorite combination was 14-16-18-20 on a standard AW (wide- ratio, 0.75 / 1.00 / 1.33) hub. A half-step chainring combination, such as 38-40 or 40-42, would have provided at least 20 non-redundant ratios spanning a very useful range of roughly 40 to 100 gear-inches.
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Old 07-17-06, 09:00 AM   #6
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Hi Retro,

Thats part of why I am starting planning now. I certainly am open to suggestions, I was thinking the roller brake for the rear hub, and disc up ft.
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Old 07-19-06, 02:44 AM   #7
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Hi Tom2slow, see Sturmey hub, 3 chain rings
Since that posting I changed the rear sprocket from 23 to 18 for more top end (the 18 tooth is for a coaster hub and didn't need thinning). The 23 sprocket is very low and sounds like what you want. I like the big steps in gear ratios and simple operation; with smooth kevlar tires it is fast, rides over glass, potholes and kerbs - a ghetto blaster and one of my favourites.
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Old 07-19-06, 03:19 AM   #8
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About the only real advantage of hub gears is that you can do away with fragile, maintenance hungry derailleur mechanisms and have a simple clean chain setup. This is an advantage esp on a muddy winter ride.
There are 2 ways of extending the range of hub gears without having to use derailleur mechanisms:
1. Use a 14spd Rohloff hub which was designed for MTB use.
2. Use a Schlumpf 2speed chainwheel.
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