Experiments in corgi geometry

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  • A couple of years ago I built up a Fuji Jari and have put some miles on it with daily commuting and local audax events. I've found I prefer to be quite far forward on the saddle, whether climbing or snoozing away miles on the invisible aerobars. Following a fit last year where they had my saddle fully forward on an inline post and still wanted another inch for my short legs, I put in a gnarly forward-offset post and.. I like this a lot. Needing to shuffle some bikes around, I found a local builder to give me that forward position in a new frame without the need for a triathlete seat post.

    Front end (stack, reach) almost identical to current Fuji, slightly taller head tube to account for different headset stack. Same length stays, and a 78 degree seat tube which should be good for about an inch or so forward of "normal".

    Build will be a mix of ebay scrounging, discount retail and the groupset + wheels moved over from the Fuji (which will become a budget 1x gravel/snow bike).

    Frame is out to paint this week. There's a chance this will be the last bike I own so hope it works out.


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  • Interesting project. I had thought that most FDs are optimised to work on seat tubes of "normal" angles, which is why we don't see geometry like this so much. What's the paint plan?

  • Huh, good point. I'll find out soon. 30/46 rings and a band-on for the FD, hopefully flexible and close enough at that range to work. Paint will be low key, not too flashy. It's a commuter half the time.

  • Frame collected at long last. I'm told I need to wait another 2 weeks for the paint to cure properly hard enough to fit stuff like the FD clamp. Oh well, have waited several months already, I can do another two weeks. Will sew up a bag for the new rack in the mean time.

    Very happy with the way the brazed joints came out.


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  • Frame looks nice, who is the builder? Would love to see a full shot too.

  • Peter Olivetti in Boulder, Colorado. Should have some proper pics up in the next few days, and maybe a shakedown ride next weekend if we aren't in full CV19 lock down by then - things moving very quickly on that front around here.

    Missing a few bits and some tidy up, but nearly complete. Large clearances will be taken by fenders.


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  • Yeah things are moving fast here (UK) too but determined to get out on the bike this morning. Something about the head tube being brazed and tapered is 👌

  • Real nice

  • Something about the head tube being brazed and tapered is

    Yeah I really like the brazed joints at the top. The bottom bracket cluster is welded. Besides the geo that's what I really wanted on this frame. The HT is from Solid Bikes.

    Decided not to have the fork painted at the last minute as I'm planning to put a dynamo wheelset on it eventually and plain black will hide the wire better. I'm ok with the black/blue combo.

  • This is super cool, looks like a practical version of those NJS frames with the super aggro seat tube angles. Or like a dirt-road TT bike.

  • Really like this. I actually quite like the large clearances as well, without the fenders...

  • Just read this project sorry for a late comment a bit late for you as you already got a new frame .but my daughter had the same issue too. top tube to long even with a short stem .why don't I just turn the set back seatpost 180 the setback clamp facing the front a cheap hack

  • Yap that works in a pinch. I'd already gone to inline posts so didn't have an offset one to spin around and many of them won't give enough angle in that direction any way, so I got one of these ugly bastards on ebay which has done until now:

    Keeping my eye out for a Pro PLT post like Adam Hansen runs. I'd prefer that to this tri post.

  • Really nice frame and build. Love the Olivetti logo too.

  • Getting there slowly. Fit is good and everything is nice and square.

    Can't eliminate rubbing at the front brake so I'll try spacing the caliper out a hair, but waiting for some proper bolts to arrive before faffing with it more so that'll be next week. Got a black Tubus Vega rack on the back now, seems solid, nice torx hardware - working on a bag for it. Fenders need some modification and a flap added. Nice to have things to tinker with given the state of things :)

    There's also a wee writeup from Pete in the Velonews "Virtual NAHBS" day 2 post today.


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  • Love the Olivetti logo too.

    Same. He has a modern version of the logo too but I like this hand styled one.

  • Bag done. Might get to fenders this afternoon.

    Oh and found a bubble on the front tire and the rear is beginning to square off, so new tires on the way. Bummer.


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  • Of course it snows again.. just new tires and right-sized stem to fit. Rear shift cable swapped to 4mm housing so I can put a cable guide in place of the third bottle cage most of the time.


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  • Bolt on cable guides? Where from?

  • Cool bag, very neat work! Got any more pictures of it?

  • I was planning on the Paragon ones which fit 2x 5mm and 1x 4mm housing: https://www.paragonmachineworks.com/frame-building-parts/cable-stops-guides/cc4312-aluminum-triple-cable-clamp.html but I have seen other versions out there.

  • Cool bag, very neat work! Got any more pictures of it?

    Pretty happy with it, especially the mounting system - uses tent pole clips attached to elastic webbing underneath so it just clips onto the rack rails on four sides. I managed to tuck the fabric at one of the corners wrestling with the stiff reinforced structure which is annoying but I'm not enough of a perfectionist to do anything about it. Its non-drive-side anyway ;-)

    Bag is 12" long, 4" high at the back and 4.5-4.0" wide. Gave it a bit more height over the previous version (on the Fuji upthread).


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  • Self dredge.. taught myself wheel building during covid and finally gave this thing the setup it deserved. Light Bicycle WR38 rims on SON and Onyx hubs with some dynamo lights. Swapped the Enve fork for an Enigma GRV that has internal dyno wire routing. Itching to put some miles on it when this latest snow melts off.


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  • Wow those latest modifications really did it for me, love the matching colour fork

  • Same! Should have done this in the first place. The under-crown mount for fenders/light on the enve was always a bad idea.

    Also giving this Fizik argo tempo a go. Spesh power arc had nice shape but very firm and felt it on all-day rides. Last ride before rebuild had 30 miles of this:


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Experiments in corgi geometry

Posted by Avatar for Yemble @Yemble

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