Sturmey Archer 2 speed/Skip tooth question

[rlhender]

I built a set of 26'' Alienation hoops with a new Sturmey Archer 2 speed kick back hub, I want to use a skip tooth chainring on the front. The question I have is can you cut off every other tooth of the 2 speed cog and make it work with a skip tooth chain? it looks like it would work but thought I would ask before getting the grinder out.

Thanks

 

[deorman]

A number of people here have done that. Not a perfect fit, but apparently it works well enough for casual riding. I would expect if you really racked up some mileage it would put grooves in the rollers.

 

[Anonymous]

YES it does work,but its got to be an even number of teeth on that rear cog.

 

[Wildcat]

Maybe you can use the existing rear skiptooth sprocket as a template and use it to grind down the SA sprocket, if the diameters are the same.

 

[c.p.odom]

Of course you can cut off the extra teeth and it will function but the chain will be a loose fit.
The tooth profile for a "Skip Tooth" / "Inch Pitch" is not based on a 1/2 inch chain. The fact is it is neither a Skip Tooth or an Inch Pitch chain. The chain is based on the two separate links a 3/8 and a 7/8. The cog profile is for a 7/8 chain. This means the drive teeth are quite a bit larger than a regular 1/2 sprocket.

 

[rlhender]

Thanks Guy, I will proceed with the Grinder...

 

[hubgearfreak]

s'only a few quid if you mess it up 8)

 

[jalopyjimmy13]

so how did that work out man

 

[Dr. Tankenstein]

It may be too late, but here's one done for ya!

http://www.ebay.com/itm/Skiptooth-S...ultDomain_0&hash=item4cfd2e6e08#ht_500wt_1202

Either way, good luck!

Cheers,
Dr. T

 

[c.p.odom]

Now those are nice. Proper tooth profile and dirt cheap for the work involved.
Of course you can't fake it with a 1/2 inch pitch chain.

 

[rlhender]

I have not had time to get the grinder out yet, think I will try and buy the one on Ebay, I did get the wheels done....

 

[Harvie]

The sprockets are different thicknesses. 1/2 X 1/8 VRS 1 X 3/16 chains with the last number being the thickness/width....

 

[jaysmo]

this may sound newbish ... but couldent you just have the LBS take and swap the cogs.... i mean if you have a single speed coaster hub with a skip tooth cog and take and have that cog mounted on the SA hub? I ask cause im looking to do this for a CWC pre war frame im building on now.... and sorry if im jacking a thread just looked like the time to ask. 8) if not i might just pick up one of those cogs off ebay.

 

[c.p.odom]

The short answer is no.
Back when inch pitch cogs were common they almost exclusively were thread on. Most hub manufacturers (except track hubs) used a proprietary thread so that few interchangeable.

 

[deorman]

And even if they weren't, the skip sprocket is too thick. :|

 

[c.p.odom]

And even if they weren't, the skip sprocket is too thick.

Point well taken. This is why the maker of these new cogs has counter bored them to the correct thickness.

 

[Harvie]

you could always do what I did and weld one on the top other after cutting and fitting the pieces together.

 

[jaysmo]

The short answer is no.
Back when inch pitch cogs were common they almost exclusively were thread on. Most hub manufacturers (except track hubs) used a proprietary thread so that few interchangeable.

WOW the guy at the LBS said it could be done.. go figure ....so i guess the sturmey skipt tooth from ebay would be the way to go.....Thanks fellas...

 

[gcrank1]

And not to be too harsh on him, if, in his experience they fit on whatever he worked on, he could be right, just didnt know the whole story.

 

[rlhender]

The Ebay cog will not work on the S2C hub : (