SOLD 56cm Nimbus TT frame - Columbus Zona (Nivachrome), Stainless Dropouts, Bladed 1" carbon forks

Beautifully made custom TT frame - silver soldered zona nivachrom & Stainless dropouts

Sold with Zero components carbon bladed 1" fork (alu steerer and droupout), fsa headset and ITM stem - pics of this to follow - will also chuck in a pair of profile tri-bars and monster chainring.
I was thinking of building a TT biek but have to be more realistic about the sort of riding I'm any good at and enjoy. Much as I love TT bieks, I'll readily admit I'm shite at it. Also I never have time for silly-boy bike builds so this is most probably going nowhere.

as you can see from the image below this is a bonkers frame - designed for riding on the rivets!

ST: 61cm C-T 55cm C-C
TT: short (tbc)

More pics to follow - located in Ascot hence postage being included in the price - happy to give discounts and a coffee for those who collect in person

FRAME & FORK NOW SOLD

Very interested and dibs if I may.

I have a couple of questions. In the pic; what is the measurement from the BB to the top of the saddle? and are those 650c wheels or 700c?

I did have a username here (Frankenorange) but i could not login with that due to browser incompatability and privacy settings so had to use email and now i appear as a first time user.

Wheels are 700c and I'll have to wait till I'm home from work to confirm dimensions.
I'm 186cm if that helps.
I'll also take some pics of the chainring stem and tribars. The chainring is a brand new CNC machined thing that's quite huge (130mm BCD) and the tri-bars are Profile U-bars

Pm sent

Moar pics

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TT length is 50cm c-c

BB to top of saddle in that pic is ~80cm

Here’s the chain ring 60t x 130bcd

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Also must undibs as deffo too big for me.

Just made some proper measurements:

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Here's Sean Yates' Nimbus - used in the British 50m TT championship in 1997

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Notes on this build
Brazed with 9% nickel Bronze
Downtube is type L 50X32 mm Megatube
Dropouts are polished investment cast stainless steel, they are stronger than the normal
steel types and less prone to stripped threads on the gear hanger.
After painting, the frame is treated internally with a rust inhibitor.
The frame-build process from start to finish takes about 60-70 hours.

Notes on the design:
The idea of using a curved seat post on a road frame to move the saddle forward places the rider’s weight further over the front wheel; the result is an unstable position.
A steeper seat angle effectively moves the B/Brkt backward, this maintains stability.

The Head angle will be 72 or 73 degrees with a fork offset of 50/46 mm to produce a trail of 56--55 mm with 700c wheels.
Steep head angles transmit more road shocks to the rider. These transmitted micro vibrations contribute to rider fatigue.

A stem length of 100 mm places the Tri-Bar mass in a fairly neutral position, steering in a straight line hands off is the norm with this head geometry and Tri-Bar configuration.
A shorter stem will be twitchy; a longer stem slows it down.

Totally bonkers frame, right up my street. Probably shouldn't ask, but do you know the builder?

Yes it’s a guy called Jim Cook - I’ve got a couple of research papers by him- quite interesting/geeky stuff

Very similar framebuilding to this (albeit less conventional geo.)
https://www.lfgss.com/conversations/327642/

Interesting, both are stunners. GLWS

Cheers. Hopefully it’ll find its way to someone who can put in the build and watts that it deserves

Hung some bits on it this evening to show what it looks like

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The good news is that there’s bags of room for 25mm tyres - probably enough for 28mm

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And the bad news is that with an FSA orbit headset there’s just 20mm of steerer

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The orbit headset is quite big (33mm stack)

when I bought the frame it did not come with a headset so I’m guessing it originally had something a bit thinner…

couple of research papers by him- quite interesting/geeky stuff

Tell us more...

One on the design of Lo Pro frames and one on welding & soldering frames.

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• DESIGN_OF_LOW_PROFILE_FRAMES.pdf
• Welding_Notes.pdf

I like the idea of a world where an intelligent fred-in-a-shed can craft the fastest bikes on earth with no need to partner with an F1 team ...

Just to clarify headtube dims, the 150 mm in my geo chart is C-C
The headtube itself is 205mm and the Fork steerer is 256mm - see sketch below
The current headset I've fitted is 30.5mm stack so 205 + 30.5 =235mm leaving 20.5mm of steerer.
If you buy an M:Part headset with 25mm stack that would leave you 26mm of steerer.
The ITM Millenium stem has a 34mm clamp which would be about right.

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