Nervar 631/633 (5-pin, alloy, type 1)
Main Photo
Category:  Cranksets
Name:  Nervar 631/633 (5-pin, alloy, type 1)
Brand:  Nervar
Model:  631/633
Years:  1960's - 1970's
Country:  France
Weight:  587 grams (Actual),
with 48/32t Spécialités T.A. rings and bolts
Added By: seaneee on 02/11/08
Updated By: flim on 09/27/22
Additional Photos - click for full size
Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)Nervar 631/633 (5-pin, alloy, type 1)
 Verify Component Photos
Chainring CountDouble; TripleBCD 50.4mm
BB StyleSquare Taper (ISO)Pedal Threads14mm x 1.25mm (French);
9/16" x 20 (English)
BB Length Depends on setup usedFlutes Crank Arm
Lengths 170Arm/Spider MaterialAluminum Alloy
Front MarkingsNervarBack MarkingsB.S.A. (for English pedal thread)
Extractor Threading 22x1mm (Standard)  
General Information
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Additional Resources
Resources:Reference & ChartsCatalogsGear Calculator
Brand Information(click to expand)
 Often the forgotten manufacture of French cranksets after Stronglight and TA, Nervar cranks are often found on even the best French bicycles.  Many models will take the same chain rings as highly sought after (and thus expensive) models of the other French brands.  It is also important to note that mose Nervar cranks take standard threaded tools, so hunting down a special tool for removal is not required as with other French brands.
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