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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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4,063 Posts
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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NoTubes.com
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man w/ one hand said:
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 !!!!!
As far as I know there aren't any currently available that can be made small enough and still handle the loads required. Weight becomes an issue as you make them larger of course and then fitting them within the current geometric constraints creeps in to the equation. Not saying it couldn't be done though.
 

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Premium Member
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Mike B. said:
As far as I know there aren't any currently available that can be made small enough and still handle the loads required. Weight becomes an issue as you make them larger of course and then fitting them within the current geometric constraints creeps in to the equation. Not saying it couldn't be done though.
I was wondering about size. Bicycles have space and weight issues that are less of a concern it other applications.
 

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man w/ one hand said:
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 !!!!!
This is something different, but it's worth checking - just click "technique" and than "ROLLIN' ROLL" in the menu.
I don't know how well it works or anything but I think you may be interested.
 

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*Hotter than Hell*
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710 Posts
sprag

sprag is a bearing with ramps that will only let a shaft roll in one direction.
if the shaft tries to roll in opposite direction the bearings roll up the ramps
and lock the shaft.

www.powercranks.com use this type bearing.
 
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