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Some Assembly Required
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Discussion Starter · #1 ·
I was czechen out the latest issue of Decline & saw the DT Swiss advertisement with the star ratchet hub & my brother, a mechanic, asked me why don't they build hubs with a sprag instead of star ratchets & pawls. He explained they were bomb proof, instant engaugement & most importantly CHEAP! Anyone ever tried a sprag application that you know of ??

O'yeah......Merry Christmas !!!!!
 

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Some Assembly Required
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Discussion Starter · #2 ·
I did a search on sprags & found lil' to nuthin' of a definition of sprag. However, my bro says it's a oneway clutch that freewheels one way & engauges the other. He says automatic transmissions in cars & trucks have'em in them.
 

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Training in Mexico
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Sprag Clutches

I believe Sprag Clutches will be heavier than rachets and pawls for the same torque capacity rating.
 

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Shimano Deore LX Silent Clutch

Shimano did make one about 8 years ago. I don't know of one in a disc brake version. It is black. They can be had on Ebay for about $20 or a little less. I was tempted to get one, but have sworn off all new rear hubs that aren't geared or/and disc brake compatible.

It is heavier, but what you get is instant engagement and higher torque capacity...theoretically. It is 540 grams; I think. I would get one. honest

I would conceed 100 grams for instant engagement. Any day.
 

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Harmonius Wrench
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Silent Clutch still available

long_strange_ride said:
Shimano did make one about 8 years ago. I don't know of one in a disc brake version. It is black. They can be had on Ebay for about $20 or a little less. I was tempted to get one, but have sworn off all new rear hubs that aren't geared or/and disc brake compatible.

It is heavier, but what you get is instant engagement and higher torque capacity...theoretically. It is 540 grams; I think. I would get one. honest

I would conceed 100 grams for instant engagement. Any day.
All Trek Police issue bikes come with them as stock equipment
 

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I know this is old, but there was a company arund for a while called "stealth" that made hubs with roller clutches for most biking applications.
 

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That's definately the stealth hub that I was talking about. I remember them being fairly expensive. The guy I knew who had one on his trials bike blew it up on two seperate occasions before returning to a king hub. The engagement was instant and almost annoying. The problem is that even though teh engagement is instant, there is a smal progression that occurs as the little cam shaped needle bearing is beggining to squeeze against the rotating face. for normal riding I'm sure this would be fine, but the explosive nature of trials riding puts the force into the system too fast for this progression to fully take place, then the hub slips. one it started slipping like this it must have worn one of the faces down to the point of failure.
 
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