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Old March 26th, 2014, 11:05 AM   #1
Retro Dude
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Default Box Crown Fork info

Hi Guys - Could someone with a box crown fork take some dimensions for me please? I'm thinking about having one made and first need to get the builder a design drawing.

The dimensions needed are:

- Crown width (outside of fork blades)
- Crown depth (front to back)
- Crown height
- Fork Blade diameter at crown (28x20?)
- Fork Blade diameter at dropout (13?)
- Fork blade radius

I've read the design changed somewhat over the years and any info woulf help (such as reinforcing gussets inside blades at crown).

Thanks in advance.
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Old March 26th, 2014, 12:33 PM   #2
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I have one, I think the early ones had a pile of rake...and were reynolds. I will fire off a pic and post
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Old March 26th, 2014, 4:41 PM   #3
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Thanks
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Old March 26th, 2014, 6:57 PM   #4
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Let the builder know that we await his/her results with baited breath. Don't forget the decals!

Last edited by mainlyfats; March 27th, 2014 at 7:49 AM.
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Old March 26th, 2014, 7:11 PM   #5
rick
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Default box crown forks

there are definitely different versions. Fat Mikey probably knows as much about them as anyone, unless perhaps Scott wants to chime in....
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Old July 12th, 2014, 7:10 AM   #6
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I have an '88 Team Comp with a box crown fork.
Are you still investigating?
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Old July 12th, 2014, 8:18 AM   #7
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Yes, definitely.

The builder I talked to was luke warm about building one. I think if I give him fully detailed & dimensioned drawings he may warm up to it. Plus there's a guy who does contract machining work for me that can mill the crown.

Thanks
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Old July 12th, 2014, 9:56 AM   #8
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Missed this the first time around, what frame are you looking to build this around? I know Jakozilla has a sweet one (Groovy made) built around Bontrager specs.

Place me on bated breath line.
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Old July 12th, 2014, 3:21 PM   #9
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Well, I came across Martin K's restoration of Gary Helfrich's first titanium bike:

http://www.secondspincycles.com/2013...-titanium.html

and thought that BRIGHT yellow box crown fork was awesome, it really stood out from the ti grey. So I thought I'd see if I could have one built for my 98 Ti Fat.

Take a deep breath Mig, this may take a while!
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Old July 13th, 2014, 11:13 AM   #10
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Mine are noted to be "Tange Prestige Double Butted Tubing".








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Old July 13th, 2014, 11:34 AM   #11
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Crown is 4.263" wide x 1.145" deep x 1.134" tall.
The outer ends are radiused, appears to be about 1/2" radius, possibly 1/2 of depth.
The blades have a face of 1.087" at the top and .492" at the dropout.
The blade depth into the wheel space is .828" at the crown and .5" at the drop out.
The dropout appears to have a 1.017" diameter.

There is a significant sweep to the legs and I always thought of the forks as "suspension" because they do have enough give to act as such.

I should add that mine was what I understand to be one of a few 16 1/2" frames in that model for the year and I can't say whether or not one fork size fits all.

All that being said, has there been any found for sale?
Maybe even a trashed bike might cost less than undertaking that reproduction.
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Old July 13th, 2014, 2:39 PM   #12
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Oof.
Man I want to your bike Jassie.
That's my favorite Fat of all time.
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Old July 13th, 2014, 5:56 PM   #13
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Quote:
Originally Posted by zonq View Post
Oof.
Man I want to your bike Jassie.
That's my favorite Fat of all time.
It cost enough that the dealer paid for the custom paint job out of his share, but it did come in under 24 pounds for our efforts.
I asked for a sunrise.. or was it sunset? 1988 was a while ago.


But then there is it's predecessor, the MountainKlein from earlier times.
It was forgiving where the Fat tended to teach me forgotten lessons about gravity.
Unfortunately the company went the way of Fat City too but both bikes are still hanging around here although tweaked down just a bit for comfort. Sure glad I haven't had to replace cables on the Klein though.


Last edited by Jassie06; July 13th, 2014 at 6:59 PM.
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Old July 13th, 2014, 7:54 PM   #14
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Quote:
Originally Posted by Jassie06 View Post
Crown is 4.263" wide x 1.145" deep x 1.134" tall.
The outer ends are radiused, appears to be about 1/2" radius, possibly 1/2 of depth.
The blades have a face of 1.087" at the top and .492" at the dropout.
The blade depth into the wheel space is .828" at the crown and .5" at the drop out.
The dropout appears to have a 1.017" diameter.

Awesome, thanks for the measurements.


Quote:
Originally Posted by Jassie06 View Post
All that being said, has there been any found for sale?
Maybe even a trashed bike might cost less than undertaking that reproduction.

Haven't put on a full court press for one...yet. This is starting off as a design exercise - hoping to get a local builder to make one for me.


BTW: I 2nd the "Favorite Fat", that is sweet!
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Old July 13th, 2014, 8:42 PM   #15
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I'd like to echo the above statements. That's an incredible fade paint job.
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Old July 14th, 2014, 4:00 AM   #16
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Yes, gorgeous bike. So cool to see these timeless classics in such great shape.
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Old July 14th, 2014, 5:38 PM   #17
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I can only give credit to the artisans at Fat City Cycles.
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Old September 18th, 2014, 2:09 PM   #18
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Not sure if you're still looking to have the fork built, but here's a good description on how to do it from Rody at Groovy Cycles.

http://groovycycleworks.blogspot.com...1_archive.html
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Old September 18th, 2014, 3:05 PM   #19
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Default Lost box crown

I had a nice box crown fork that was stored in my father-in-law's garage. Somehow it was lost in the divorce.

So many years later and, damn, I still miss her and tear up when I think about her (the fork, I mean).
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Old September 18th, 2014, 3:18 PM   #20
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For Sale

Quote:
Originally Posted by Max (a Fat fan) View Post
I had a nice box crown fork that was stored in my father-in-law's garage. Somehow it was lost in the divorce.

So many years later and, damn, I still miss her and tear up when I think about her (the fork, I mean).
That priceless work of art no doubt has been found a use as a garden implement or some such sacriligeous utilitarian purpose.
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Old October 2nd, 2014, 3:24 PM   #21
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Quote:
Originally Posted by Max (a Fat fan) View Post
I had a nice box crown fork that was stored in my father-in-law's garage. Somehow it was lost in the divorce.

So many years later and, damn, I still miss her and tear up when I think about her (the fork, I mean).
I love it! Was it a Team Comp Boxcrown with GP Wilson Dropouts?
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