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Vintage Bicycle Headset 25*100 27.2mm JD7
Vintage headset with 25×100 fork thread and 27.2 mm lower race. The photographs form an integral part of the description – examine the images for exact condition. Minor storage marks may be present, but no major rust or cracks are noted.
Description
A small set of cups, a threaded top race and a locknut – these pieces determine the feel of the front end. When the fork steerer carries the long-lived 25×100 French thread, the right headset transforms a vague, notchy column into a precise, smooth pivot. This vintage unit pairs that thread with a lower bearing race inner diameter of 27.2 mm, a pairing that fits countless mid-century French frames.
French 25×100 Thread & Lower Race Dimensions
The 25×100 thread pattern served as the backbone of French bicycle manufacturing for decades. A headset that matches this specification nests securely on the steerer, while the 27.2 mm lower race seats the crown race correctly. No need to shim or ream – if your frame accepts these numbers, the stack height and cup press are the only remaining variables.
Technical Data
- Fork thread: 25×100
- Lower bearing race ID: 27.2 mm
- Part number: 0000
- Country of origin: France
Should you need another example with the identical thread specification, view the Vintage Bicycle Headset 25×100 27.2mm JD8 from our catalogue. For a premium alternative, the STRONGLIGHT COMPETITION V4 headset uses the same 25×100 threading and was fitted to race-ready Peugeots like the PX10 and PY10.
FAQ
What thread standard does this headset use?
It uses the French 25×100 thread, which fits steerer tubes with that thread specification. This standard was common on mid-century French bicycles.
What is the inner diameter of the lower bearing race?
The lower bearing race has an inner diameter of 27.2 mm, matching the crown race seat on compatible forks.
Is this headset complete?
The photographs show all included parts – cups, races, locknut, and washers. No additional components are hidden; check the images for completeness.
Will it fit a Peugeot PX10 or similar model?
It fits any frame with a 25×100 steerer thread and a 27.2 mm crown race seat. Many Peugeot models, including the PX10, used these dimensions.
Are there any missing parts or major defects?
No major rust or cracks are reported. Minor cosmetic marks from storage may be present; the photographs, which form part of the description, show the exact condition.
Product Details
1 Item
Used
Data sheet
- Pays d'origine
- FRANCE
- Thread (fork)
- 25X100
- Numéro de pièce fabricant
- 0000
- Bague inférieure JDD
- 27,2
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Vintage headset with 25×100 fork thread and 27.2 mm lower race. The photographs form an integral part of the description – examine the images for exact condition. Minor storage marks may be present, but no major rust or cracks are noted.