Are BMX cogs compatible with HG?
 

I'm setting up an old mtb as a winter single speed. Looking at cogs on Ebay I see some inexpensive options listed as BMX cogs. Will they fit on a Hyperglide cassette body? Hard to tell from the picture.

Shimano 9 spline cogs are all the same*, hyperglide have 1 thick and 1 thin spline.. measure?


* Sturmey Archer S3X and the Brompton 3 by 2 6 speed hub also made by S-A use the 9 spline.. (& you can get Gates Belt Cogs)

why not start out with a freewheel hub wheel , you can build it dishless and have a stronger wheel ..

symmetrical bracing spoke angles are a winner.





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Thanks. Just throwing this together with what I have on hand, which is a cassette hub.

These would: https://www.universalcycles.com/shop...&category=5833

Thanks for the link. Those look perfect but are about double what the BMX cogs are selling for on Ebay.

Just thought to consult the Sheldon page on SS and got my answer:

You can use one of the old sprockets from your taken-apart cassette, but it you are less likely to have accidental derailment if you use sprockets made for single-gear us, with longer teeth. BMX cassette sprockets are best. These sprockets are quite inexpensive, and are available in a range of sizes.

What brand? I can tell you Shimano DX or DXR BMX cogs work and are pretty cheap. They will completely destroy anything but a steel freehub body though.

I have a feeling if they are really cheap they are coaster brake cogs and those wouldn't work. Post a link to one of the ebay cogs.

https://www.ebay.com/itm/Shimano-Typ...%257Ciid%253A1

I discovered I have a 16t in the stash so I am going to try that with my 42 ring, so about 67 inches. Normally I'd say that's low but for this bike I might actually want something lower still. Time will tell.

you might find that a 16/42 is a bit tall for a 26"wheeled bike... that's a popular BMX gearing, and the smaller wheels on them lends a different final ratio...
if you've got them, give it a try, but i'm thinking it might be too tall... your use and terrain will be the deciding factor.