La Brea Bike 

https://www.instagram.com/p/BEJgmhIh...d=bmgoyou56o4j

I think he focuses on them as art more than anything...

VintageTTfan

A Colnago. Another similar example of disc wheel art to what I have been showing you....very cool. What I really like is the unique huge solid chain ring. I love how it looks, but could someone explain the purpose of it being like that? Interesting handlebars too. Nice period correct saddle too. This is a nice track bicycle.

blamester

Flywheel effect perhaps.

VintageTTfan

A heavy revolving wheel in a machine that is used to increase the machine's momentum and thereby provide greater stability or a reserve of available power during interruptions in the delivery of power to the machine.
Of course....I knew that.....ha ha ha ha

blamester

Without knowing the weight of the disc it could be inertia. Stored energy. Smooths out the pedal stroke. I am guessing and maybe completely wrong.
It may have been for an aero benefit.
Or to stop his leg getting oilly chain marks.
Could have had a 42 tooth under there and didn't want anyone to know he was weak.

VintageTTfan

RARE AND EXPENSIVE

T-Mar

It's not a solid chainring. It's a solid, round crankarm (or crankarm cover). Note that the disc is the same diameter as the crankarm length (i.e. the pedals are mounted to it) The chainring has a much small diameter based on the chain entry and exit points. Presumably it's to reduce the aerodynamic drag of the crankarms, in the same manner that disc wheels reduce the aerodynamic drag from spokes.

VintageTTfan

Most Excellent.....forgive my ignorance....but thank you for increasing our knowledge on this....sincerely appreciated and excellent explanation. Would be nice to see a post of one of your favorite vintage TT bikes in color of course. Thanks.

VintageTTfan

The theme for today is very rare and beautiful vintage TT handlebars:


"A Nitto Tsubasa handlebar is virtually impossible to find. Produced during the 70s for a short duration of time, they were always limited in quantity. Someone told me there are less than 50 left in the entire world. To find one in mint condition for sale is near impossible."

VintageTTfan

So nice....soooo quality.

VintageTTfan

Just a hodge podge of rarities.

VintageTTfan

And a Colnago for the road....errrr track actually.......

P!N20

Think it's just the same as a disc wheel - preventing the spider arms from stirring up the air. Edit: what T-Mar said.





Sugino were doing something similar with their 75 CHCD cranks:

VintageTTfan

I love that Colnago you posted right here. Those Colnago Italian flag target disc wheels are insanely cool! I saw one on ebay and passed because I need a Colnago to go with it. I like things matched. The price was reasonable and that thing was mint....pretty rare. The guy was in Argentina I believe. They are beautiful wheels. The front one here looks in better shape.

I love solid chain rings.....totally. They are super expensive now. The huge disc that fits over the chain ring is unique though. The pedal is on its outer circumference first of all. Also, it is frickin big. And it is not an actual chain ring as T Mar pointed out. You are correct in that the same principle applies in that the goal is to cut down on air turbulence. I wonder if it really worked. It looks cool though and very unique.

Thanks for post as they are always of the highest quality.

VintageTTfan

Here is something kind of unique.

VintageTTfan

And.....

Man that frame is nice....beautiful shape and design...but star of show is the disc wheels. They are for the 1984 Los Angeles Olympics if you can't tell, and man are they gorgeous! I would crawl over a thousand feet of glass for these....but seriously I want um. The fact that they commemorate such a great event is part of their mystique of course. But they look sooooo cool. The stars...the rings.....aaaaah.....these must be as rare as an honest politician. I am trying to imagine what they would sell for. I am going to say that you might have to get a bank loan to get um. Of course the period correct saddle and bullhorns don't hurt.

P!N20

Clamont is the in-house marque of Clarence St Cyclery in Sydney, Australia. The high end and custom frames are built by Geoff Scott, who also builds frames under the Gefsco marque. He is a very highly regarded frame builder in this country and certainly provided frames for the Australian Institute of Sport (AIS.) He is still making frames to this day.





Here's a good article: https://veloaficionado.com/blog/shoo...-frame-builder

VintageTTfan

That Gefsco frame is a work of art. It is very subtle and has the spirit of mastery. I can see why he was so highly respected. It is a truly beautiful frame. Thanks for he article too which is always great because it increases our historical knowledge. Thanks so much for sharing with everyone.

VintageTTfan

You know just your average day in the city where you stumble on abandoned bikes like these that people don't want anymore.

markwesti

Now this looks good .

VintageTTfan

Thanks....good taste.

VintageTTfan

Love the disc wheels....the bike you know.

VintageTTfan

Quality.

VintageTTfan

Speaks for itself.

VintageTTfan

Beautiful Pinarello. The violet shades paint scheme is gorgeous. They made a lot of vintage TT's so was a specialty for them I would say. Their bikes are usually lovely things. Like the aero seatpost. Do not like the bulky handlebar stem. Shamals are nice...not my very favorite but nice. Period correct saddle as is best.