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Technical & Reference Section => Tech and Restoration => Topic started by: Mikku on August 02, 2017, 12:43 PM

Title: Cog ID
Post by: Mikku on August 02, 2017, 12:43 PM

I was rummaging through a sale box in a Tokyo BMX shop the other day and found these 2 cogs in an unmarked bag. The only marking they have on them is the tooth size, and from what I can gather by looking at the splines and digging around online, they're either older Shimano DX cogs or Shimano-compatible ones. Being a bit of a newbie when it comes to cassette hubs, does anyone recognize 'em? Thanks in advance! :daumenhoch:

Title: Re: Cog ID
Post by: insectbones on August 02, 2017, 09:58 PM

I'm sure early skyways had those type cogs too Mick  :daumenhoch:

Title: Re: Cog ID
Post by: Mikku on August 03, 2017, 02:44 AM

Thanks Lee! Now I just need to work out if I can use them! ::)

Title: Re: Cog ID
Post by: monkian on August 03, 2017, 05:03 PM

Nice little find Mick. They look like they could well fit Shimano cassette hubs. There were two different versions for BMX though and I think the cog fitting was different on them. Unfortunately I haven't got one here to check for sure. Suntour also made a BMX cassette hub. I guess they'd most likely be for a Japanese brand ;)

Title: Re: Cog ID
Post by: monkian on August 03, 2017, 06:21 PM

Not sure if this helps Mick but here's some shots of the Shimano cassette hubs from the 81 JBM catalogue:

(https://uploads.tapatalk-cdn.com/20170803/2801147f4cb6bedafc197dd16bedfcc2.jpg)

(https://uploads.tapatalk-cdn.com/20170803/12c82cd333f79411ddb001c09a0d8351.jpg)

(https://uploads.tapatalk-cdn.com/20170803/8b91a8b10adbc30b81435149a937855e.jpg)

Title: Re: Cog ID
Post by: Mikku on August 04, 2017, 04:45 AM

Thanks for posting that Paul. The teeth on those cogs look to be directional (not sure if that's the right word but you know what I mean!) whereas mine aren't. However, I've seen some others that look more like mine, so maybe there were 2 versions.