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Track Hub Threading Issue

So... I built up a wheel using a Bitex Track Hub (the ones they sell on bikehubstore)

Anyway, the cog (EAI deluxe) didn't thread on by hand nearly far enough to even fit a lockring on. I thought I may have cross threaded, but no; rather, on further inspection, the issue appears to be that there are far fewer threads on the hub than on other track hubs I have used (i.e. all city / miche). It almost looks like they forgot to thread the last part of the hub, but apparently that's just the way their hubs are designed. (in a related note -- I wouldn't recommend bitex rear track hubs hah)

Couple questions.

1: If I am able to force the cog on with a chainwhip far enough to get the lockring on, would this pose a safety or durability issue? I.e. would the cog have a greater risk of slipping and/or damaging the threads?

2: Would a bike shop be able to add some more threads to the hub? Not sure if that's something they typically do, or if I would have to go to a machine shop (probably more inconvenient and expensive, I would guess)

thanks in advance for any help / thoughts.
June 28, 2019 05:03 PM
1. Probably, but it's hard to say especially without a picture. If I give BHS the benefit of the doubt, it may just be that you're not threading the cog onto the hub completely. For example: threading an EAI cog onto a phil hub for the first time takes a lot more effort than is usually necessary. People have told me that this is because the thread pitch is slightly different between the two, or because the anodization on both parts makes the threads a little tighter, but whatever the case a similar thing could be going on here.

TLDR: make sure the back on the cog is making contact with the stop of the hub.

2. Not a chance. You could talk to a machine shop about potentially doing that work, but I have serious doubts they'd be able to do it at all, let alone or a price that makes you happy. Machining is done in stages and it's not uncommon for say: step 6 to make going back to step 2 impossible. In this case you're trying to go from like step 30 back to step 12.

Contact bike hub store. They're a pretty reputable place afaik, so you should be able to work something out with them.
June 28, 2019 09:57 PM
From: Salem, Oregon
544 posts
13 bikes
thanks a lot for the helpful and detailed reply!

i actually had contacted bikehubstore and they were really helpful in confirming that this is just the way the bitex hubs are designed, and also offered to send a cog that was designed to work with the hub.

However, I'd like to use the EAI cogs I have, and they were (understandably) unable to answer the two questions I asked here.

measuring with a caliper, I found that the bitex hub has ~ 3.4 mm of threads, compared to the ~ 6 mm on my all city track hub (all city = silver in the below photos).

June 29, 2019 04:35 PM
In this discussion board you talked about the Track Hub related trading issues which need to resolved. Here different people put their suggestion which they definately should follow and make the low chances of getting similar issue again. Well! I try to get college paper reviews but i must say we should participate in such good discussion.
July 3, 2019 11:21 AM
2 posts
0 bikes
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April 13, 2020 03:45 PM
From: UK
71 posts
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