The schlumph mountain
bottom bracket with planetary gears looks pretty cool.
It is foot actuated and allows a reduction of 2.5. I was curious
what sort of gears it would give my bike so I calculated:
No wasted gears, a nice shifting pattern with only one double
shift, as low a gear as I could want for a really steep hill or a
really heavy trailer. A total range of 501%, which is almost as
good as a rolholff
526%. The schlumpf is rated for use with coaster brakes, and my
SRAM T3 is tough enough for the schlumpf. But how to justify $.5K
for a new bottom bracket?
For reference, my current gearing is based on approximately 28
inch wheels (622mm rims, largeish tires), a 48 tooth front cog, a
22 tooth rear cog, and a SRAM T3 hub that offers 1st, 2nd, and 3rd
at 73%, 100%, and 176%.
Comment via: facebook