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French-threaded bicycle headsets

French-threaded headsets on this page: Campagnolo Super Record | Stronglight Competition V-4 | Galli A9 (made by Stronglight) roller bearing extra-light

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French-threaded headsets differ from British/ISO headsets in only some of their parts:

French British
Steering tube threads 25mm x 1.0mm (.984" x 25.4 tpi) 1" x 24 tpi
Fork crown race 26.5mm (can be 27.0mm) 26.4mm
Head tube  30.2mm 30.2mm
Stem (or gooseneck) diameter 22mm 22.2mm (7/8")

 

The steering tube is what really differs. It is a slightly smaller diameter and the threads are different. For that reason the top screwed-on race, lock washer and lock nut are not interchangeable. The fork-crown race is different as well.

Plus, most British threaded steering tubes have a groove for a notched lock washer while it is most common for French steering tubes to have a flat filed for the lock washer.

The pressed-in head-tube cups are the same diameter and are interchangeable.

French and British diameter stems have different diameters that need to be respected. Don't mount a French-diameter stem in a British steering tube.

Please use this as only a guide. Over the many decades, different makers have used different dimensions. What we have listed above is the most likely to be found from major manufacturers.


Campagnolo Super Record French-threaded headset. New, $150.00

Part# 33190

Campagnolo Super Record French-threaded heaset

A classic headset for that treasured French bike.

Campagnolo Super Record headset

Another view

Campagnolo Super Record headset

Plus, the orginal mounting instructions


Stronglight French-threaded Competition V-4 headset. Used, $80.00

  • Produced from the 1960s into the early 1980s
  • French threaded: 25mm steerer x 1mm (25.4 tpi).
  • This is the second version with an octagonal locknut rather than the early version that required a pin tool.
  • Includes bearings. This headset uses 5/32" ball bearings
  • This headset has V-shaped bearing surfaces, significantly increasing headset life. Making V-shaped bearing surfaces requires great care as the tolerances are very small if the headset is to work.

Stronglight V4 headset

Though not in the picture, this headset includes bearings.

Stronglight V4 headset

Here are the same parts flipped over

Stronglight competition headset

In lovely condition

Headset wrapper

And made in the French bike making capitol, St. Etienne.


Galli A9 (made by Stronglight) French-threaded roller bearing extra-light headset

We have three: New w/black plastic cups | New w/black plastic cups, missing lower cup | New w/silver alloy cups

Galli A9 (made by Stronglight) French-threaded roller bearing extra-light headset. New, $90.00

Part# 33189

This headset has an interesting design. It is made with several black plastic parts fitted with floating steel races. To extend the life of the bearing surfaces, it has needle bearings.

Galli A9 headset

Still in the original factory box

Galli A9 headset

Close-up

Roller bearng headset

Made with roller bearings for a long life.

Galli A9 (made by Stronglight) French-threaded roller bearing extra-light headset, missing lower cup

Part# 33189-S

This headset has an interesting design. It is made with several black plastic parts fitted with floating steel races. To extend the life of the bearing surfaces, it has needle bearings.

Galli A9 headset

Missing the lower cup. You can see "Galli" on the far side of the lock nut.

Galli A9 headset

Another view

Galli A9 headset

Close-up

Galli A9 (made by Stronglight) French-threaded roller bearing extra-light alloy headset. New, $65.00

It was mounted in a new bike before we removed it.

Galli A9 headset

It was in a new bike or framset

Galli A9 headset

It is made with roller bearings.

Galli A9 headset

Close-up