Fat City Cycles Yo Eddy fork Vs. BOI (Big One Inch):my forks

[OldFatTi]

I think there’s basically the following variations of A-C lengths (feel free to add/correct):

Original Yo around 390mm, pre suspension era

The 1” legged Yo that came on the 10th Anniversary Fat in 1992 that I think was still 390mm

The BOI officially introduced in 1993, with short suspension travel correction for early ~2” travel forks, around 405mm long

A few rare “proper” Yo forks with short sus correction, ~405mm like the 1993 BOI above but with the burlier 1-1/8” legs… very rare as most Yo’s were being fitted with suspension in 1993/1994, and at this point the BOI was becoming the only rigid fork

Some later (maybe 1996 ish?), slightly longer BOI forks at about 410mm? To cater for ~2.5” travel frames?

And the last edition of the longest 420mm BOI forks for the last NY era frames which had geometry for slightly more suspension (circa 3”) again.

 

[MuchAlohaNui]

I was going to list this on eBay about five minutes ago and have been deep diving into what exactly I am holding to accurately convey the information to potential buyers in the Item Description area. But if this is what I think it is, then well...I guess I am shopping for a frame!

About three years ago I inquired with ya'll and the answer wasn't quite clear. After finding this thread through a general online search as well as others made by Scott Bengston (your appeal to authority) elsewhere online, I am almost certain this fork is rarer still than the BOI, I thought I had a BOI, but I do not. If anyone can argue one way or the other, I am very happy to update this post with corrected information!

I am the second owner of the fork. The fork was pulled off of an early 90's Stumpjumper Team (which I have since sold) that the original owner bought new along with the YO Eddy! fork and where he raced in the Swiss circuit for some years. When I picked up the bike he made it clear several times that the fork 'cost him a lot of money'. He was in love with this fork like saying goodbye to an old girlfriend. Additionally, I had no idea what a YO Eddy! even was let a lone a magical fork. I even asked if he still had the original fork! At any rate...

The lengths/measurements, weight and appearance puts this fork as a pre-BOI, YO Eddy! fork that has the correction for short suspension as outlined above by @OldFatTi.

Utilizing information from this thread and measuring myself I have come up with:

Threaded steer tube: 1" dia
Thread length: 30 mm
Steer tube length: 130 mm (to bottom of crown)
Inner diameter of steerer tube at the bottom: 18.7 mm (approx.)
steerer tube thickness at the bottom: 3.8 mm (approx.)
Axle to crown: 390 mm
Blade length: 375 mm (axle to top of leg)
Blade diameter: 1 1/8"
Bottom of dropout to bottom of crown: 405 mm
Total length: 515 mm
Stress Gusset (tear drop material welded to upper portion of the blades) length: 54 mm
Width of blades overall highest point: 132 mm
Top of blade to center of brake post: 123 mm (approx.)
Weight: 780 grams

If this is indeed real, then I need a frame to go with the fork. Thank you!

 

[M-Power]

Its a lovely original Yo Eddy fork but not as rare or valuable as an original factory BOI. I would definitely recommend waiting for the right Yo Eddy frame to turn up to fit it. Depending on the condition, it might be nice to repaint in Grello or some OG FCC fade. FCC invented this style of segmented fork and patented it, since copied countless times by modern bike designers. Enjoy

 

[MuchAlohaNui]

Its a lovely original Yo Eddy fork but not as rare or valuable as an original factory BOI. I would definitely recommend waiting for the right Yo Eddy frame to turn up to fit it. Depending on the condition, it might be nice to repaint in Grello or some OG FCC fade. FCC invented this style of segmented fork and patented it, since copied countless times by modern bike designers. Enjoy

Thank you, sir! Does this one pre-date the BOI? I was under the impression this fork came first, phased out, and replaced by the BOI?