Technology

ASTech Aerospace Technology

For the construction of our products we use methods that are not used in the bicycle industry but in the aerospace industry, such as in hand layup directly in the mold and one to one quality control. When only the best is one option this is the way to go.

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LPS Low pressure system and Viscoelasticity control

When you use high pressure you have low voids, which is good for the reliability but the bike does not feel like an extension of your body. It has harsh and abrupt behavior. In our frames we use low pressure, which changes the viscoelastic behavior of the bike, making it one with you by absorbing the tarmac imperfections. In order to eliminate the voids, which are a result of the low pressure, we use VibraTech, our Vibration Technology, which eliminates the voids during the curing cycle by applying resonance. With this way we have both comfort and reliability. This technology was the research result of the Phd of one of the company owners.

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LCS Long cure cycles

In mass production bikes, high temperature is used to cure the resin of the carbon fiber. In this way fifteen minutes to an hour are enough. But when you cure the CFRP so fast you do not get the most out of it. If you increase the curing time the resin has time to melt and to flow through all the fibers for perfect homogeneity. Also we have the extra benefit of post curing with which our bike acquire environmental and UV resistance. Each frame is cured for 30 hours.

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Vibra Tech Vibration Technology

VibraTech is our Vibration Technology, which eliminates the voids during the curing cycle by using resonance. We combine it with long curing cycles. When the resin is liquefied and stays liquid for quite a while thanks to the long curing cycles, we apply resonance to remove the air bubbles that are trapped within the fibers and the resin or are created by the moisture which exists inside the resin. In this way we have a compliant bike with top end stiffness.

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IMHL In mold hand layup

In mass production, the plies are wrapped around mandrels and are then placed in the mold so as to cure under pressure. But the fibers do not always follow the exact shape of the mold and create imperfections such as bridges or wrinkles. The imperfections are covered using putty and paint. Not in Gram Bikes. We place the plies one by one in the mold by hand and we can perfectly control the placement of the patrons. The result? No imperfections.

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True monocoque

In mass production the frames are created in pieces and are then glued in one piece. This creates areas which are stiffer than the other frame and causes stress raisers which can cause failure or delamination. Our frames are one piece from the headtube to the dropouts. There are no weak points or alignment problems caused by the gluing of multiple pieces. In addition the frame has a unique riding feeling when turning, sprinting or climbing. It is an extension of your body. A true engineering miracle. Yes, it hard and complex to construct but since it is the best we do not care!

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MA Multidirectional aerodynamics

When you ride with your bike the wind in your worst nightmare. In the flat when you go with more than 30km/h 99% of your power is consumed in aerodynamics. While climbing even at speed as low as 10 km/h both headwind and crosswinds slow you down and disturb your pace. Gram frames are studied so as to reduce the aerodynamic resistance in both case as much as possible from both the bicycle and the rider by applying a more aggressive riding position.

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CSCT Controllable stiffness and compliance technology

A frame has a lot of tasks. It must transfer your power and deal with the road imperfections. Our unique combination of tubing shape, layup, low pressure curing, long cure cycles and true monocoque technology give you the best mix available when it comes to extreme stiffness and adequate vertical compliance.

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UTFP Ultra-thin front profile and ITS Inner tapering system

Aerodynamics are affected by the surface exposed to the air. By using internal instead of external tapering we reduce the frontal area which causes drag. The stiffness is maintained by the use of a little extra material.

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Threaded BSA Bottom Bracket

Press fit systems usually suffer from alignment problems and damaged circularity in the bearing cup areas. This only means extra drag and early wear in the bearings. We use BSA Bottom bracket which is constructed in one piece in a lathe for perfect bearing alignment which practically eliminates drag caused by pressfit systems. It costs more and it is more difficult to produce but this is our choice when every second counts.

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Perfect Imperfections

For riders not interested in aesthetics at all and when pure performance is all that matters we offer the option in our custom frames to be without any finish. These frames have small holes that look like aesthetic imperfections in the outer surface which have as a result the reduction of turbulence flow which causes aerodynamic drag reduction using the “golf ball effect”.

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Rear entry dropouts

Rear entry dropouts offer the best possible power transmission and have the option to add adjustability in the chainstay length

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Ultra short chainstay

The length of the chainstay is critical for maximum power transmission. The shorter the better. We have gone to the maximum limit with our design which warranties you lose nothing in power no matter how hard you push.

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Oversize tubing Design

By using specially shaped oversized and aero tubes we have the ability to offer maximum stiffness and very low weight due to the reduction of material thickness.

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Pretentioned fibers

In our products there is a series of plies that is pretensioned when placed in the mold. This adds stiffness to the final product without having to add extra material and unnecessary weight.

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Airbrush painting

The best products need the best finish. In all our products we use airbrush painting by hand instead of water decals. This gives the option for custom creations and offers a unique and premium look for your bike.

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Woven and UD

Most manufacturers use 99%+ UD material. This if not the best option when you want long life for your product which can easily be hit and damaged since the fibers are only held by the epoxy resin. We use a mix with more woven material which apart from the epoxy uses the mechanical properties of the weave to increase the durability and the lifetime of the product.