8mm pitch pulleys from an exercise bike

Today I picked up some handy belt drive parts from an exercise bike that was amongst verge side rubbish.
I am hoping to use this on my next build using a RC motor.
Unfortunately the bike was in bad condition and I couldn't find a brand or a model anywhere on it and I didn't have the camera with me.
The pedals were attached to the large 116 tooth pulley and this drove the smaller 17 tooth pulley on the flywheel. To save anyone doing the calculation, the ratio is 6.82 to 1.
The 17 tooth has a sprag bearing that fits on a 16mm shaft.
Here are some photos.




Hopefully this is interesting to someone.
Cheers,
Matt.P.

WoW ...nice find ! 8)
Any clues as to what make or brand of exercise bike that was ?

PS, i think that is technically a roller/ramp clutch rather than a sprag.

I found this: http://www.searspartsdirect.com/partsdirect/part-model/Stairmaster-Parts/Exercise-cycle-Parts/Model-3400CE/3360/1307200/50034495/00002

Hillhater said:

PS, i think that is technically a roller/ramp clutch rather than a sprag.

Click to expand...

Thanks for that, I wasn't sure what to call it.
I wonder if it can take 5 to 7 kw?

Hillhater said:

Any clues as to what make or brand of exercise bike that was ?

Click to expand...

1000w said:

Unfortunately the bike was in bad condition and I couldn't find a brand or a model anywhere on it and I didn't have the camera with me.

Click to expand...

Miles said:

I found this: http://www.searspartsdirect.com/partsdi ... 4495/00002

Click to expand...

Interesting, not the same model but maybe many exercise bikes have toothed pulleys.
Cheers,
Matt.P.

1000w said:

Miles said:

I found this: http://www.searspartsdirect.com/partsdi ... 4495/00002

Click to expand...

Interesting, not the same model but maybe many exercise bikes have toothed pulleys.

Click to expand...

It says it's for an HTD belt. I shouldn't imagine a replacement part for an exercise bike would be a cheap way to get a pulley, though...

Miles said:

It says it's for an HTD belt. I shouldn't imagine a replacement part for an exercise bike would be a cheap way to get a pulley, though...

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Cheap when they are on the side of the road.
I am keen to do a single stage reduction with a RC motor, so I want large pulleys like these.
I and many others have not been able to source large toothed pulleys so I think this is quite interesting.
The pulley in the link you posted looks like it has heaps of teeth.
Cheers,
Matt.P.

Nice find, great idea.. thx 4 posting.

1000w said:

Hillhater said:

PS, i think that is technically a roller/ramp clutch rather than a sprag.

Click to expand...

Thanks for that, I wasn't sure what to call it.
I wonder if it can take 5 to 7 kw?

Click to expand...

See attached, Matt.