Argon 18 Gallium Pro 2011 Frameset
toni jaya sport
The new Gallium incorporates a lower bottom bracket shell that sits 75mm below the hub axle centerline, as opposed to the traditional 70mm drop, standard on road bikes since the days of wide, clip-and-strap pedals. Why the change?
There are two good reasons:
With a lower BB shell, stresses in the down tube are more vertically distributed. This lessens the tendency bikes have to lift the front wheel under hard accelerations on steep uphill sections, so the rider can concentrate on the effort in breaking away without any concern about a squirrely handling bike. On descents, the forces experienced by the down tube and seat stays take a more vertical path, helping to keep the wheels in contact with the road.
Lowering the bottom bracket lets us shorten the head tube. In doing so, we’ve improved lateral rigidity in the front triangle, which leads to more accurate steering and greater efficiency in accelerations.
But what about pedal clearance in turns?
With 70mm bottom bracket drop, the maximum lean angle for pedaling in turns-with 175mm cranks and clipless pedals- is 120* ; with the BB at a 75mm drop, this angle becomes 119
So, the “penalty” for a lower bottom bracket amounts to one degree of lean angle, practically an imperceptible change. The gains in terms of stability and rigidity are much more significant.
The Argon 18 Fit System insures:
An ideal position for riders of all sizes.
Stellar road manners, a nimble bike in all models and sizes.
Correct seat tube angles, top tube and head tube lengths and well-conceived general proportions in every frame size. Argon 18 bikes are more comfortable, more stable, making the most of every rider’s potential.
The 3D Headtube is a structural extension of the head tube. It allows for three head tube heights (0mm, +10mm,+20mm) for each frame size. The 3D Headtube offers riders a number of advantages:
Optimal positioning that respects the individual’s physical proportions and riding style/preferences.
Increased rigidity, compared to traditional headset spacers:
+5% at 10mm
+11% at 20mm
Fully Integrated / Assymmetrical Frameset
The new Gallium Pro is offered as an integrated frameset, including the carbon monocoque Ga31 fork, the Argon 18 ASP-6000 carbon seat post and the 3D headset.
Argon created a new mold that maximizes lateral stiffness with massive, asymmetrical chainstays as well as very large bottom bracket and head tube dimensions.
The new monocoque carbon Ga31 fork uses a conical steer tube with 1’’1/2 and 1’’1/4 bearings and features an integrated crown race that boosts rigidity while reducing weight.
HDS - Optimized Monocoque Construction
The tubes that make up a bicycle frame each have a distinct, specific function. To define the various functions for each area, our thinking divides the frame along a diagonal reference line that runs from the top of the head tube to the rear wheel dropouts.
All the lower frame tubes-the downtube, chainstays and bottom bracket area must above all transmit all of the rider’s energy to the rear wheel, with as little loss as possible for maximum efficiency. These elements must therefore be very rigid.
The tubes in the upper part of the frame serve a very different purpose: they must be vertically compliant so as to filter out excessive vibration coming up from the road surface.
For an optimal result, a number of factors enter the picture:
The material used: each grade of carbon fiber exhibits specific properties.
In the case of carbon, composite design is important: number of plies, fiber orientation.
Tube size and shape: all else being equal, a larger-section tube offers greater rigidity.
7000 HM Carbon
7000 HM carbon was developed around the larger tube diameters of the new Gallium and Gallium Pro mold. This composite, along with the HDS principles that guided the frame design, lets us obtain the most vibration damping from the upper frame while still allowing maximum stiffness in the lower areas where it is critical for efficiency. If the rider can produce the power, this bike can respond in kind.
Stiffness to Weight ratio:
All else being proportional, in comparison to the regular Gallium for 2011, the Gallium Pro-built in the same mold-exhibits spectacular stiffness-to-weight ratios*:
Head tube: +14%
Bottom bracket: +8%
7000 HM Carbon
Argon 18 GA31
FSA Model 62 1 1/4" - 1 1/2"
Argon 18 ASP-6500 - 31.6mm
68mm / English
Frame Weight (appr.)
for more informations, please contact to www.tonijayasport.com