Ambrosio Colnago (6-arm)
Main Photo
Category:  Cranksets
Name:  Ambrosio Colnago (6-arm)
Brand:  Ambrosio
Years:  Late 1970's - Early 1980's
Country:  Italy
Added By: Catnap on 05/03/11
Updated By: peterbman on 04/14/17
Additional Photos - click for full size
Ambrosio Colnago (6-arm)Ambrosio Colnago (6-arm)Ambrosio Colnago (6-arm)Ambrosio Colnago (6-arm)Ambrosio Colnago (6-arm)Ambrosio Colnago (6-arm)
Chainring CountDoubleBCD 
BB StyleSquare Taper (ISO)Pedal Threads9/16" x 20 (English)
BB Length Flutes Crank Arm; Spider
Lengths 170Arm/Spider MaterialAluminum Alloy
Front MarkingsColnago ErnestoBack Markings
Extractor Threading 22x1 Left Hand / Integrated  
General Information
A pair of Ambrosio 6 arm cranks put aside for a pair of Colnago Oros. These cranks appeared as an option for all Colnagos from the late 70s thru to the early 80s. They appeared to come in only one size 170 but with an option of two inner chainring sizes. 36 tooth and 42 tooth. Both types are shown here. Also, the original cranks were not supplied with crank dust caps or chainring bolts. Most owners used campy components as in the crank on the left, but the black bolts on the right crank look pretty cool as well. These cranks were highly polished and the chainrings were anodised. The non drive side crank arm is exactly the same as the regular 5 arm crank.
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Additional Resources
Resources:Reference & ChartsGear Calculator
Brand Information(click to expand)
The Ambrosio trademark is also being used by a UK company that produces components and accessories using the 1980's logo.

Doug Charles: "here is what I have been able to glean on the Ambrosio/3TTT relationship, all from third party sources. Ambrosio founded in the early 1900's in Turin initially making steel bars and stems, until the 1930's it was a large concern in the bike biz, but slowly started to fade. At some point, alloy bars, stems and rims are added to the mix. In the early 1960's, Piero Marzorati from Milan family buys Ambrosio to add it to their existing company which makes among other things, steel rims. Initially, bars and stems were made until the sons, Sergio and Maurizio take over in the late 1960's and push more emphasis on the rim side of the business. In the 1970's, rims are the biggest part of what they do. In 1961 (when Marzorati shows up?), long term employee, Mario Dedioniggi leaves Ambrosio and founds 'Turin Tube Technology', which is soon to become 'Techo Tubo Torino'. He also starts with steel bars and stems ... He soon converts to aluminum with Ergal coming in 1975 for the Superleggero bar. In 1985, Dedioniggi leaves and sell the brand to Antonio Colombo et al. Colombo founds a new company, so as not to compete directly with Cinelli with the plans to call it '3TTT S.p.A." but the clerk forgets the other two 'T's' and it becomes '3T' ...So, they appear to be parallel companies of the same parent in the 1960's-70's with ties, but not the same company and to this day, have different addresses."
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