Ambrosio Montreal Durex Crono
Main Photo
Category:  Rims
Name:  Ambrosio Montreal Durex Crono
Brand:  Ambrosio
Model:  Montreal Durex Crono
Years:  Mid 1970's - Mid 1980's
Country:  Italy
Weight:  315 grams
Added By: vxpro on 04/27/08
Updated By: Munny on 07/21/19
Additional Photos - click for full size
Ambrosio Montreal Durex CronoAmbrosio Montreal Durex CronoAmbrosio Montreal Durex Crono
Rim Type TubularMaterialAluminum
Rim Size700c (622 mm)Spoke Drillings28; 32; 36
Label MarkingsAmbrosio Montreal Made in Italy;
Crono; Durex
Valve DrillingPresta
Rim Height (mm)Rim Outer Width (mm)20,5
EyeletsDoubleSeam Joint 
FinishGold Anodized; Hard Anodized  
Wheel Lacing Data
Rim Size 700cERD 618 mm
General Information
3rd picture: 1980 (or 1981, not sure) catalog scan.
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Additional Resources
Resources:Reference & Charts
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 6)BrandGroup
Ambrosio Montreal (first version)Ambrosio
Ambrosio Montreal - Mappamondo D'Oro - Premio internazionaleAmbrosio
Ambrosio Montreal Medaille d'OrAmbrosio
Ambrosio Montreal DurexAmbrosioMontreal rims
Ambrosio Montreal (yet another variation), Montreal rimsAmbrosioMontreal rims
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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