Riding Discipline – Road
Corretto – Darren Baum — Concept — This model can be tuned to whatever the customer requests, from a criterium racer to a multi day stage racing bike. This particular bike is a 100 mile plus gran fondo/stage racer. The frame is mostly painted, with the seat stays and chain stays in raw titanium. The seat stays and chain stays are more prone to stone and chain damage so they are finished as brushed titanium. Brushed titanium is more resilient and easier to touch up than paint. The painted section of the bike creates a beautiful bike with the flexibility that allows the customer to express themselves through the finish of the bike. — Material — Titanium 3Al/2.5V CWSR Seamless Grade 9. Each tube individually butted to suit the rider (done in house). Titanium 6Al/3V small parts (dropouts, cable stops, bottom bracket). Carbon fork (Enve 1.0 50mm) Stainless Steel GT style head badge. PPG Automotive paint — Design — Lower bottom bracket matched with faster steering to suit long, fast descents. Neutral/light steering. Purpose built for Di2 with an externally mounted battery for easy access and the reliability of using the standard Shimano battery. Extensive machining to reduce weight – internally relieved head tube, custom designed bottom bracket with large breather holes, butted tubing, custom designed dropouts. Large tube diameters with butting to improve stiffness without a weight penalty. Carbon sleeve in the seat tube to fit a 31.6mm seat post, a readily available size. Scalloped and bi-ovalised chainstays Long top tube length relative to the seat height combined with a large seat to bar drop to suit this customer’s build and position on the bike. Darren is nearing 40 and grew up in the era of horizontal top tubes, so he has opted for a 3 to 4 degree top tube slope. Stiffness: the frame, bars and wheels are an integrated package with the fork stiffer than the wheels, which are stiffer than the bars. The enlarged chainstays (25.4mm) give the stiffness increase necessary with the lower bottom bracket. Traditional headset for ease of maintenance and precision of installation. Custom dropouts with windows reduce weight and allow a small amount of bending to allow alignment post welding. The hanger is stiff enough for electronic shifting but if hit hard will give and can be bent back. — Construction Process — Each bike is made from start to finish in one hit with several people being involved in the manufacturing process. We do not pre-butt and pre-mitre tubes because each bike is highly customised. Our team takes a lot of pride in building desirable, high quality bicycles in an efficient manner. We have created a production system that allows for customisation, efficiency and high quality. Customisation means each bike has custom geometry, tubes, finish and parts. The tubes are selected from a range of diameters (44.5mm, 38mm, 35mm for the down tube for example) which can be butted to a range of wall thicknesses down to 0.6mm. There is a wide range of paint schemes from which to choose and there are 33 standard colours and tens of thousands of custom colours. Our production systems must be flexible enough to allow for this customisation and to incorporate all our models and design changes that happen over time. They must also allow us to be as efficient as possible. We achieve the efficiency and flexibility by designing jigs and machining stations that are used for one process only (e.g. drilling bidon holes) and have a wide range of adjustment. High quality is a combination of getting the same output every time and being able to control what that output is. For example, if an angle is to be 30.7 degrees, I want the output to always be 30.7 degrees and I want to be able to control whether it is 30.7 degrees or 30.8 degrees. Our custom built machining stations and jigs ensure the that desired high quality can be achieved with ease. — Finish — All finishing is done in house. The paint finish is all paint – no decals are used. This requires a complex process of masking, spraying colour and spraying clear coat. PPG automotive paints are used for their range of available colours and the durability of the paint. Modern GT style with clean, straight lines. Simple two colour design When pressed for the reason behind his colour choice, Darren said “I don’t know, I just like the colours”. Flow coated for a smooth finish Matching post and stem — Delivery Process — Delivered as a complete bike with all components as per customer specification. — Special Notes — Darren does not often build a bike for himself, so we are happy he has made an exception to his self imposed rule and built himself a Corretto. It will be great to see it out on the local roads and the mountain climbs of Victoria.