Prototype adjustable cranks on eBay

lol these cranks are really wierd ... they do have a pretty good
adjustment idea, but the cranks are specially made for workout bikes
and they go all diff directions there is another thread about this

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skianduniaddict said:

im to hard core to use my elbows i either use my head or the mouse
swungs as a whip

yeah buddy thats right ... uni 4 christ 🙂
-stephen skrobarczyk- cctx 🙂
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Somebody had better buy these and put them on a unicycle (how I know
not...)

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'PowerCranks' (http://www.powercranks.com/) are a very strange product.
I tried them on a stationary bike at the Seattle Bike Expo a few years
ago. It was as if I didn't know how to pedal at all. I could not keep
the cranks even remotely 180 degrees from each other. I quickly turned
the stationary bike into an almost kangaroo bike. If anyone gets a
chance to try them on a stationary bike take the opportunity. They are
that strange.

The product descriptions and video clips on the PowerCranks site will
explain the concept behind the cranks. The cranks are on one-way
bushings that apply force on the bottom bracket spindle only in the
forwards direction. They will not turn the bottom bracket spindle when
you pedal backwards. There is nothing mechanical forcing the cranks to
stay 180 degrees from each other. The cranks are free to spin
independently of each other.

The bearings that you see on the spindle end of the cranks in the eBay
pictures are the one-way bushings. The eBay cranks seem to be missing
the part that actually fits on the bottom bracket spindle. That
adapter would be either fit a square taper or one of the road bike
spline designs (like the Shimano design). Without the other parts the
cranks in the auction would just be a paper weight. It's not even
clear if he has one left crank and one right crank. They could be both
right side or left side cranks.

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john_childs said:

The bearings that you see on the spindle end of the cranks in the eBay
pictures are the one-way bushings. The eBay cranks seem to be missing
the part that actually fits on the bottom bracket spindle. That
adapter would be either fit a square taper or one of the road bike
spline designs (like the Shimano design). Without the other parts the
cranks in the auction would just be a paper weight. It's not even
clear if he has one left crank and one right crank. They could be both
right side or left side cranks.

I wonder if a square taper could be fixed aside the round holes.
Anyway, it was an interesting item because of the adjustability.

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steveyo

steveyo

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steveyo said:

I wonder if a square taper could be fixed aside the round holes.
Anyway, it was an interesting item because of the adjustability.

They could still be an interesting buy for a unicyclist if the price
doesn't go up. You could buy them just for the one-way bushings
(bearings) and use the bearings to make a custom coaster unicycle. A
coaster unicycle is a unicycle that you can pedal forwards but not
backwards. I don't know how much the one-way bearings are worth by
themselves, but probably more than the current bid plus S&H.

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