Gnutti splined (5-pin)
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Category:  Cranksets
Name:  Gnutti splined (5-pin)
Brand:  Gnutti
Model:  5-Pin
Years:  1951 - ?
Country:  Italy
Added By: Catnap on 12/13/13
Updated By: peterbman on 10/23/16
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Gnutti splined (5-pin)Gnutti splined (5-pin)Gnutti splined (5-pin)Gnutti splined (5-pin)Gnutti splined (5-pin)Gnutti splined (5-pin)Gnutti splined (5-pin)
Chainring CountDouble; Single; TripleBCD 50.4mm
BB StyleSplinedPedal Threads9/16" x 20 (English);
9/16" x 20f (Italian)
BB Length 119.5mmFlutes Crank Arm; None
Lengths Arm/Spider MaterialSteel
Front MarkingsBack Markings
Extractor Threading Proprietary  
General Information

The Gnutti splined bb/cranks pre-date Williams by over a decade and Shimano et al by many years. Much more precise (finer splines) than Williams too, it's believed that these were costly to manufacture and production never really took off after introduction in 1951/52. Great idea but they simply cost too much at the time.

The crank bolts are an allen key style with alternate threadings (right/driveside, left/non-driveside). The crank arms are 170mm in length, and some examples are fluted on the outside faces, while others do not have flutes.  For use with standard thread (9/16") pedals. The axle is offset towards the drivside, measures 119.5mm in overall length and is stamped "Gnutti Italy Brevete" and "1-OA". The adjustable BB cup is stamped "4/7" and the fixed cup is stamped "5 - 7" and "S".  Crank extractor is a proprietary model and quite rare.  All the Gnutti logos on the cranks are clearly stamped. The back of the driveside arm is stamped "1PA", the non-drive arm is stamped "1LA".

Quality:Rarity:
 
 
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