ENGLISH

TECHNICAL

RAL# 3015
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Materials

Carbon Fibre
Carbon fibre fabric impregnated with resin is the basis of all carbon frames. The fabric, pre impregnated with resin, is kept in freezers until required to keep the resin from setting. To make a structure in carbon fibre 2 things are required, a mould to give a form to the material and an autoclave to polymerize the part, maintaining it in a vacuum and applying external pressure to increase the compactness of the layers. that holds the fabric together and gives the object its form. Depending on how the fabric is laid up in the mould as to how the fabric will mechanically perform, changing the direction and quantity of the fibres has a great deal of effect on the stiffness of the finished part. The birth of a frame starts when the carbon fabric is laid out on a cutting table and various pieces are cut out to form the part in the mould. Once the pieces are in place in the various moulds a bladder is put into the mould and inflated. The mould is then put into the autoclave and cured in a heated vacuum. The vacuum ensures there is no air trapped in the resin between the layers of fabric as that would weaken the structure. Once the part has been cured it is then removed from the mould and is ready for use.

Steel
The traditional material of the bicycle since the start. Simple to join, strong and with a good amount of elasticity and resistance. Steel is a mix of metals, the base ferrous material has various other elements added to it to make it strong, more elastic and to better handle the heat generated when welding or brazing the tubes together. Modern tubes are formed without any seams, they are pure tubes. The tubes are then butted to make a tube that has varying wall thickness with the ends being thicker and the middle being thinner, the thicker ends of the tubes are required to deal with the heat that is generated when joining the tubes together. Tube diameter has a big effect on tube stiffness. For our lugged frames we use fairly standard tube diameters 28.6, 28.6, 31.7mm



Sizing and Geometry

We produce all our frames in either standard or custom geometry.

Standard Geometry
We produce frames with sizes from 48cm through to 58cm with 1cm increments.
Standard Sizing Chart available here.

Made to measure
Before the advent of sloping frames the standard was to have a made to measure frame. Behind the philosophy of the sloping frame is the standardisation of the the frame sizes which allows you to go from a traditional production method to a semi-industrial. To have a range with just 3 or 4 sizes instead of at least 10 brings a sizeable cost reduction. At this point we need to ask ourselves a question – It is necessary to have a made to measure frame? We think that for the most part the answer is yes. Yes because we are all different, in our anthropometric measurements, in the way we pedal and ride. Yes because its in the tradition of frame building. For both the steel and the carbon, while having a standard geometry chart, contrary to what the market offers we prefer to make made to measure frames for our customers. This approach does not make any difference to the delivery time and does not make any difference to the final price.

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