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How To Convert 1inch Threaded To 1 1/8 Threadless  RSS Feed

#201 2016-11-10 6:06pm

ritchiecamaro
Pro MemberI'm no role model
From: Battle Creek, MI
Registered: 2011-03-30
Posts: 4279
Bikes: 75
For Sale: 6

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

So, what I have done is just the opposite... I put threaded 1" forks on a Haro cruiser 1 1/8' threadless frame... Same concept, just use parts from both headsets til you find something that works... Here's what I've come up with...

http://uploads.bmxmuseum.com/user-images/61851/100_67385825270a7b.jpg
http://uploads.bmxmuseum.com/user-images/61851/100_673758252719ec.jpg
http://uploads.bmxmuseum.com/user-images/61851/100_67395825271a18.jpg
http://uploads.bmxmuseum.com/user-images/61851/100_67415825271acf.jpg


44t BMX Club, "Midway Chapter"... Favortie bike:1983 Schwinn Predator... Schwinn, SuperCross, Free Agent, Anlun, Mongoose and Redline PL24 fan, as long as it's not a Hutch, I'll ride it... Predator owners show your PREDATOR LOVE and post your Predators here: http://bmxmuseum.com/forums/viewtopic.php?id=741107
                      Predator count: 15 (and rising)       420 for LIFE!!!

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#202 2016-12-29 6:15pm

duramaxhp
Centurion Member
From: Washington
Registered: 2014-06-01
Posts: 156
Bikes: 10

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Building a Hawk F24 xxl would 1" Chris king cups work  for the 1 1/8" conversion?


WANTED HAWK FRAMES or completes

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#203 2017-04-01 11:19pm

ChattyMatty
Pro Member
From: La Mesa, CA
Registered: 2009-05-24
Posts: 2098
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For Sale: 6

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Not to be Mr. Shameless, but since the other guy posted himself up here for kits he used to sell I might as well. If you don't want to go through the hassle of all this, the proper way to do this is to machine the 34mm threadless cups to fit the smaller 32mm headtubes of traditional BMX bikes on a lathe. The reason the old hit-and-miss method works is that the cups for a vast majority of threadless headsets are the same as BMX sizing, they just have thicker walls for the portion which inserts into the headtube. Just sorta how they evolved BITD, they used existing caged bearing sizes when they invented 1 1/8th threadless (with exceptions of course, YMMV).

Atomic Paul sells a traditional steel caged bearing version on his website, and I stock sealed bearing units or can customize your favorite headset (Chris King or whatever you like) to order. And yes, compatibility with integral forks is doable, even the ones with the thicker base on the steertube, just depends on the brand of headset you choose. And yes, I can do one-off sizing like Worksman frames which often use a proprietary size right in between. The prune bot closes threads every month, but I've always got an ad running in the Swap section if you search, or just PM me. I won't be discontinuing these any time soon.

http://uploads.bmxmuseum.com/user-images/29827/img_20161001_13124957f040779b_blowup58e0973d84.jpg
'95 Schwinn (originally 1" threaded) with one of my sets installed on 1 1/8th Landing Gear forks.

Last edited by ChattyMatty (2017-04-01 11:20pm)


I machine sealed bearing 1 1/8" threadless conversion headsets and extensions to fix those cut bars.

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#204 2017-04-02 2:35am

briscokg
Pro Member
From: Clinton Township Mi
Registered: 2015-09-22
Posts: 161

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

That's what I hate about this site. I'd like to save just your post but I have to get the whole thread instead. I'll save the email notice until I figure out my questions.


On FB - Michigan local Bmx, Join us.

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#205 2017-04-02 4:28am

troynlori
Moderator"Pedal Peddler"
From: Virginia Beach, VA
Registered: 2009-11-22
Posts: 12235
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Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Click this link:

http://bmxmuseum.com/forums/viewtopic.p … 2#p5801492

Brings up his post.


Hutch Fun Facts: All main line Hutch's with digits only S/N (no letters or baseballs) on the rear drop outs were US made and had their dropouts stamped between late '83 and '86.  Obviously the frame manufacture would occur slightly after that, even if they just threw 'em in a bucket randomly.  There is an obvious date code in that the first 2 digits seem to be the month and the 3rd digit is pretty obviously the last digit of the year running from '83-'86.

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#206 2017-04-02 5:04am

troynlori
Moderator"Pedal Peddler"
From: Virginia Beach, VA
Registered: 2009-11-22
Posts: 12235
Bikes: 11
For Sale: 61

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

So we are saying for most headsets (both threadless 1-1/8" & threaded 1") that:

-Ball diameter is the same
-BCD (Ball circle diameter in the cage) is the same

?

Is it a close approximation and therefore works good enough or is it right? 

This comment from ChattyMatty seems to answer my question:

"The reason the old hit-and-miss method works is that the cups for a vast majority of threadless headsets are the same as BMX sizing, they just have thicker walls for the portion which inserts into the headtube."

I just want to know the technicality.


Hutch Fun Facts: All main line Hutch's with digits only S/N (no letters or baseballs) on the rear drop outs were US made and had their dropouts stamped between late '83 and '86.  Obviously the frame manufacture would occur slightly after that, even if they just threw 'em in a bucket randomly.  There is an obvious date code in that the first 2 digits seem to be the month and the 3rd digit is pretty obviously the last digit of the year running from '83-'86.

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#207 2017-04-07 8:06am

ChattyMatty
Pro Member
From: La Mesa, CA
Registered: 2009-05-24
Posts: 2098
Bikes: 5
For Sale: 6

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Generally, yes.  I have run into issues with the cage shape sometimes conflicting with the cup (the edges of the cage bind on the cup, kind like what happens if you put it in upside down) but for the most part they're the same. For example I imagine if you went out and bought two sets from the same brand, say a Necco BMX and Necco threadless you'd have the best luck with the mix-and-match approach as the manufacturer will want to economize on the number of bearings they have to stock/manufacture. Buying a brand new set and trying to mate it to a cup for 1982 be more likely to generate conflicts. Either way, the loose balls with sticky grease method does work too.

BUT- there are some 'heavy duty' sets which use a larger bearing circle, and that will cause you problems using the cages. For example this set (tiny pic, sorry) is one with the wider bearing circle-

http://uploads.bmxmuseum.com/user-images/29827/img_20150328_18141658e7a86dcd.jpg

Thanks for the link BTW, I really didn't want to be a slimeball and turn this into an ad for me me me especially as the prune bot will delete the thread from time to time Already kinda feel like I'm blurring that line smile


I machine sealed bearing 1 1/8" threadless conversion headsets and extensions to fix those cut bars.

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#208 2017-10-22 12:33pm

Lilflatty8
Pro Member
From: Memphis, TN
Registered: 2017-08-07
Posts: 665
For Sale: 7

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

What kind of cranks are those?


Wtb Titanium Odyssey Black Widow Spindle.

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