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Old 12-16-07, 02:11 PM   #1
john_iverson
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BMX and some cruiser frames use same headset?

This is a repost of sorts sinice I didn't get any response to my last one.....

I was reading on Sheldons site that some one piece crank bikes (cruisers and BMX were mentioned) use a different headset than the standard 1 inch or 1 1/8. I am building up a ~2000 Jamis cruiser frame for my daughter and 1 inch headsets are WAY too small, yet a 1 1/8 is just a little too big, on the order of a milimeter or so. I'm hoping to get this wrapped up by Christmas but am losing hope. Please help!!!!!

Thanks,
John
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Old 12-16-07, 02:39 PM   #2
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Yes, there is a BMX-specific headset (threaded) that sounds like what you are looking for. Cup size is something like 32.4 mm (off the top of my head)
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Old 12-16-07, 05:20 PM   #3
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LWab,
Thanks, that's what I am gathering. I'm hoping that there is not a third, BMX/cruiser type steeer tube that I need to account for as well? I've got several 26" forks that I can use but they are either the "normal" 1 inch or 1 1/8.

I could have easily bought a bike for what I've got into this so far--Guess that's my very own Christmas present to myself!!!! It'll be cool as hell when it's done, even if it's not finished on the 25th.............

Anyone else got any experience with this sort of thing???


John
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Old 12-16-07, 08:12 PM   #4
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BMX steerer tube is pretty normal externally but with a thicker wall. The headset is designed for a 21.1 mm stem, not a 22.2 mm. You can replace or modify the locknut to allow fitting a 22.2 mm stem. Watch the crown race size if you swap forks. The difference between 27.0 and 26.4 mm can be a pain.

Most BMX cruisers were designed around 24" wheels, not 26". I guess you are talking about '50s Schwinns and suchlike with 26" wheels though.
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Old 12-16-07, 10:18 PM   #5
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You are right, it's a old school style beach cruiser style frame although it was built by Jamis around 2000 or 2001. They still sell it, (it's called the Earth Cruiser) although it is now tig welded aluminum with more standard BB and head tube. Mine is steel and definately a learning experience!

I have both a 1 inch fork and a 1 1/8 but these are just your average cromoly rigid forks--will either steer tube diameter play nice with this headset size? (that is assuming I can pick one up at one of my LBS this week...

Thanks for the help--I'll get this ******* to gether so my daughter can ride it next week if it kills me!
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Old 12-17-07, 12:12 AM   #6
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1" fork might but check. As I mentioned previously, 26.4 is not the same as 27.0 (crown race diameter). Ask your LBS for more info and measure your 1" fork and headset accurately.
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