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Old March 11th 19, 03:09 PM posted to rec.bicycles.tech
Rolf Mantel[_2_]
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Posts: 267
Default Coaster Brake Failure

Am 01.03.2019 um 21:38 schrieb Ralph Barone:
"Internally geared bottom bracket"? You mean, like a Schlumpf drive?

http://www.schlumpfdrive.com/index.php/home-en.html

I wonder what would happen if you coupled that with the 13 rear cogs
system mentioned upthread?


Bah. Go big or go home. SRAM makes a three speed IGH that will also accept
a 9 speed cassette. Use that on the back and a three speed front derailleur
with a Schlumpf drive up front. Then add computer control because you'll
never figure out which of the four shift mechanisms you should be using at
any given time.


Actually, figuring that out (on a recumbent trike minus the Schlumpf)
was not that difficult as long as you take into account that the
three-speed is significantly more efficient in the direct drive-2 setting.

You use the 3x9 derailleur like on a normal bike. You use the IGH for
two purposes:
1) to extend the gearing on extreme uphill and extreme downhill
2) you can switch IGH to low for re-start after an "emergency stop" (red
light, yield to unseen car) in a high gear

Rolf
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