Nervar 631/633 (5-pin, alloy, type 2)
Main Photo
Category:  Cranksets
Name:  Nervar 631/633 (5-pin, alloy, type 2)
Brand:  Nervar
Model:  631/633
Years:  Late 1970's - ?
Country:  France
Added By: pc on 06/29/12
Updated By: peterbman on 12/27/16
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Nervar 631/633 (5-pin, alloy, type 2)
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Chainring CountDoubleBCD 50.4mm
BB StyleSquare TaperPedal Threads9/16" x 20 (English)
BB Length Flutes Crank Arm
Lengths 170Arm/Spider MaterialAluminum Alloy
Front MarkingsNERVARBack Markings22 78 (near eye) and BSA (mid-arm)
Extractor Threading   
General Information
Crank bears no marking showing length.
Came with English-threaded cups.
Axle is plated, races ground afterwards.
Axle is marked 22 78 (a stamping) and has NERVAR is small raised letters opposite the big NERVAR stamping.
Additional ring between chainrings very thin, is tapered radially (shifting aid?)
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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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