What cogs fit a JoyTech hub?
 

I have a single-speed Kona Unit bike. The rear hub is a disc hub with a splined freewheel from JoyTech. I see a multitude of threaded and splined cogs on the market. Which are compatible (and which aren't) with the JoyTech? The most common cogs I see are three-tab Shimano Nexus/Alfine ones. Although my JoyTech hub has more lands and grooves, will the Shimanos work?

I've learned to look at Mr. Sheldon Brown's site before posting stupid questions here, but I find no mention of the JoyTech rear hub.

Thanks - FH

I probably don't know the whole Joytech range. The one I know used a Shimano compatible freehub shell.
And AFAIK the 3-tab pattern used for IGHs isn't compatible with the splines for the EGH.
"Splined freewheel" is a strange way of putting it.
Freewheels are generally treated as complete units, clutch and sprockets as one.
And they thread onto the hub.
But take the sprockets OFF the freewheel, and guess what - it's splined.
Freehubs, you treat the clutch mechanism and the sprockets as separate units. And yeah, the sprockets are splined.

Why not post some pics?

Normal single speed cogs. Surly are probably the most common but there are a few brands. You'll get 3/32" ones for your unit. Here Universal Cycles -- Surly Single Cogs

- joel

most cogs for single speed and track are either splined (shimano or campy compatible) or threaded (two common and mutually incompatible thread patterns).

there are some proprietary cogs, like White Industries, that work with only their hubs.

when purchasing, most will denote their compatibilities. same goes for the hub.

a pic of the cog you have showing it's pattern would help give a definitive answer.

oh, and as noted above, they can come in 3/32" or 1/8". and yes, it may make a difference. :)

Specifics unseen. Joy Tech is a lower cost component company prone to copying other common parts .
companies spec them to lower a bikes selling price.


Whole freewheels screw on or if a driver on the end of the hub freeweels count the spline teeth many adopt Shimano's 9 spline . squared shape
they introduced a BMX Racing freehub that is where that spline type originated and others copy to be compatible.

[Now cassettes use similar but 2 splines 1 wide 1 narrow , align the shift gates on cassettes .. ]

The single speeds 9 are all same width.

which is as used on Sturmey Archer the size of a standard screw on freewheel . so the spline tip is threaded..

but the splines , machined down from that so they in that specific case also take the 9 spline cog (there they get the Fixed Function)
Or a screw on Freewheel .. the 9 spline thru Sturmey Archer (S3X parts) etc. would be $5 where the Surly one is $30.

the other 3 spline rounded notch, is shared by many makers of 3 speed hubs for almost 100 years

Hmmm - Not so simple:

There's 1.27 and 1.39 diameter hubs, both with 24 tpi left-hand threads.

The JoyTech hub has both splines and threads (for the locking ring). There is no document that I can find that gives the diameter for the JoyTech.

Shimano makes multiple splined hubs for their cogs. There are the 3-tooth Alfine cogs, and others with more splines.

NOBODY that I've seen seems to have a clear description of the hubs, their dimensions, or their cog compatibility. Cambridge Bicycles seems to offer the most cogs that I've seen, but even their site doesn't go into any detail about what is (or isn't) compatible. Sheldon Brown's site seems similarly bereft of good information.

In addition to the incompatible "track" and "single speed" cogs, there are also a host of incompatible coaster-brake, three-speed, internal-gear, and multi-speed cogs.

Considering the voluminous information available for all other aspects of bicycling online, I'm very surprised at the lack of single-speed cog info. Does anyone know of a comprehensive reference?

Thanks - FH

JoyTech only makes one single speed hub with splines and the website indicates that it is a "cassette gear" hub, which means it uses the standard Shimano/Sram cassette spline pattern. You can test it by taking a single cog from a cassette and fitting it on the splines.

Is this the same as a "HG" splined cassette hub? Because that's what the "Gusset 1'er steel cog" says it is on the Cambria site.

Or is this the same as a "Shimano MX66 cog?" Because that's what the Shimano cog says it is on the Cambria site.

Or is this the same as the "Shimano BMX cog?" Because that's what the Dimension cog says it is on the Cambria site.

Or is this the same as the "Shimano Dura Ace 7600" threaded cog? Because that's what the Dura Ace cog says it is on the Cambria site.

Or is this the same as the "Shimano 1 type cog?" Because that's what the Crupi cog says it is on the Cambria site.

And these are just from the first page of MULTIPLE pages of cogs. There is NO compatibility chart given, and only some of the cogs have sufficient info to determine their dimensions. So what, exactly, is a "standard Shimano/Sram spline pattern?" And how, exactly, does it match with the other definitions given in the product descriptions?

"Is this the same as a "HG" splined cassette hub?"

cannot see a thing .. it's all guess work .. brand name alone really is not sufficient.

Pictures always clarify ... any links to what you have..

the company has been around for decades ..

Sorry, fletsbob - My comment was intended for Mr. dsaul, who also attempted to help. He says that the JoyTech is a "standard Shimano/Sram spline" model, but I'm not sure which of the multiple cogs on the Cambridge site meet that description. Even if I took a photo & measured what I've got, unless I understand the terminology that the manufacturers use, I may still end up ordering the wrong cog (as I've done at least three times, now, via eBay).

This is far less simple than one might suppose. Apparently, there may be multiple names for the type of hub that meets the "Shimano/Sram spline" specs. There are (for a fact) multiple cogs that look like what might fit on my hub, but actually don't. There are at least two different diameters of splined hubs (may be more) and more than one spline pattern. The possibilities seem to multiply like rabbits. Nowhere have I been able to find a table that gives all the different names of cog types and shows which are actually interchangeable.

What I plan to do is to disassemble my rear wheel, measure both the land and groove diameters, count the splines and measure the widths of the lands and grooves, and measure the thread pitch on the outside surface. I'll then e-mail the data to Cambridge and ASK what fits.

This could have been simpler, quicker, and far more obvious if only someone had taken the time to make the "cog-interchange table" that I've been looking for.

I appreciate the help, and maybe you can tell by looking at the pictures on the website which cogs will and won't fit a specific hub. My attempts have been far less successful, and it is becoming an expensive effort to buy cog after cog that won't work.

Cordially - FH

HG is actually a tooth profile.

ANY current Shimano/SRAM 7-9 speed cassette cog (with the possible?? exception of the smallest end cog) will work.
They will only fit on one way because the large spline is offset.

I didn't include 10 speed because there are some exceptions.

Maybe you can stop by the LBS and see if they have a loose cog to test fit?

Can threaded cogs also be used on this hub?

S-A S3X or the JT ?

JoyTech

Every cog you listed will work on your hub, with the exception of the Dura Ace 7600 cog. The Dura Ace cog is a thread on fixed gear cog. Threaded cogs will not work on your hub. Your hub should have one wide spline, which positions the shift ramps on geared bikes. Its not necessary on a single speed, but its there so you can use cogs that have that pattern. Most aftermarket cogs will have the splines all the same size, but they will fit on the shimano hub and just leave a small empty space where the large spline would be.

Thank you, dsaul. The JoyTech also has threads on the outside of the splines for a locking ring. Since it seems to be threaded across its entire surface, do any threaded cogs fit?

I don't know for sure if any threaded cogs will fit. The entire surface is probably threaded to accommodate different width cogs. The base of some single speed cogs is wider than the teeth to prevent digging into aluminum freehub bodies. On a steel freehub body, you can just use single cogs taken from a cassette with spacers to get the proper chainline.

Yes - This JoyTech does have spacers so that a variety of cog body thicknesses can be accommodated. For a plain "flat" cog, the proper chain line seems to be with the cog in the direct center of the splined/threaded part of the hub with an equal number of spacers inboard and outboard. Some cogs, however, have a cast-in "shoulder" on the in or outboard side of the actual cog. A single threaded locking ring tightens the spacer/cog pack against the inner shoulder of the hub.

If a threaded cog had the same diameter and same 24tpi left-hand-thread configuration, it could also (theoretically) be used on the hub. Whether or not the diameter would match is the question.

I made the mistake of ordering a variety of 3-tab cogs via eBay thinking they would fit, but it seems unlikely that they will. I also ordered one threaded cog on the (mistaken) assumption that all threaded cogs were standardized (not!). I've re-ordered the two cog sizes that I want most in the proper spline configuration as a result of this thread. Thanks for the helpful feedback.

I may still e-mail Cambria and/or Sheldon Brown with the suggestion that a "single-speed cog compatibility table" be created to avoid confusion. Even the splined cogs seem to come in a variety of diameters and cog-configurations. The Shimano Nexus/Alfine, the Rolhoff, the Campagnolo, the coaster-brakes, and the Sturmey-Archers all seem to use unique cogs that aren't compatible with the Shimano spline pattern. Despite this, they all can use the ⅜ or ¼ inch chains. Further, the cogs that DO use the Shimano splined pattern seem to be marketed using a variety of names.

All's well that ends well, so I think I've actually got the proper cogs coming to me now. It really shouldn't have been this hard, though...

I doubt that you will get a reply from Sheldon Brown.

True, but somebody runs the site...

A picture would be worth a thousand words in this thread.

Dude I linked to the right cogs up at the top. The threads are just for a lock ring. They're interrupted by the spines and will not take the force of pedaling. Plus how would you unscrew one? You'd need a spline cog to us on your chainwhip anyway.

- joel