Lightest Steel Frame?

[Guinessisgoodforyou]

Experience tells me not to trust a manufacturer for bike weight.

Or most other features...

I suspect they've taken the tyres off

The bikes were weighed for diagnoles and Randonneuring to the best of my knowledge. It was big business.

 

[bikeworkshop]

There's an acceptance of a certain level of dishonesty in advertising that varies with period and nation/culture.
That's certainly a surprising weight to achieve with the equipment of the period and function pictured.
Is it a coaster brake?

Sadly I'd need to hang it on the scales to believe it

 

[Guinessisgoodforyou]

There's an acceptance of a certain level of dishonesty in advertising that varies with period and nation/culture.
That's certainly a surprising weight to achieve with the equipment of the period and function pictured.
Is it a coaster brake?

Sadly I'd need to hang it on the scales to believe it

No, cantilever rear.

 

[doctor-bond]

Here’s another: ex Peugeot team CX frame in 753 - 55cm 1725g

 

[Jonny69]

Ishiwata did by far the thinnest wall tubing. 015 would have been the lightest frame you could build, assuming you were light enough to ride it safely!

Some of the current Kasei tube sets used in NJS keirin are probably as light. Stronger steel and multiple butting too.

 

[doctor-bond]

Ishiwata claimed sub 1600g for unbuilt frame tubes (inc fork legs) in large 60cm size. Didn’t someone on here score a NOS 753 tubeset recently? Be good to get a weight check.

 

[vcballbat]

My Raleigh SBDU 753 Dynaflite fillet brazed at low temperature using silver solder. Size 54.5 c-c coming in at 1700g with chrome chain stay protector, forks less the crown race 600g.

 

[Canuk]

No, cantilever rear.

Yeah, but it says on the advert 7kg 900 gr, so 7.9kg, which is 17.5lbs. Not bad for a single chair wheel, 5 speed Steelie, of the era

 

[Canuk]

I'm sure I read that Jan Raas had a 753 Raleigh under 1500gr, that would be a small frame though. Probably a 21.5in

 

[Canuk]

8kg is decent, but a double chainring, front changer, lever and extra length of chain would probably put another kilo on it, which is about normal for a 531 road bike.