Giant Propel Advanced Disc: Explained


Giant Propel Advanced Disc: Explained

Everything you need to know about the 2018 Giant Propel Advanced Pro Disc product range. We go through an in depth product description and the science behind creating the new Propel Advanced Disc range.

Giant Propel Advanced Disc 2018: Explained

#UltimateSpeed is not just Giant's new marketing hash tag. It's the core design principle that acted as the driver for development of the new 2018 Giant Propel Advanced Disc range. When Giant set out to make a new Propel Advanced 3 years ago, it needed to be guided by the motivation that what they delivered had to be lighter, stiffer, more complete and faster than its predecessor. In short, it needed a 'back to first principles' design approach; 3 years of development and testing with Aero Concept Engineering (ACE) in Magny-Cours, France and a 'integrated system' approach, delivered quantifiable gains and measurable improvements.

The first phase of design focussed on engineering the best aerodynamic design for the frame, handlebar/stem combination and wheels. The new 2018 Giant Propel Advanced frame went through 300+ iterations using Computational Fluid Dynamics. Over 300 different changes of cross-section analysis,CFD proved that over a wider range of yaw angles (0 degree to 30 degrees), a truncated ellipse cross-section was faster (10W power saving average compared to the previous Propel Advanced) over a traditional tear drop shape - a major cross-section change for the Propel. In fact, not one tube shape is the same as the previous Propel.

Each frame prototype was subjected to water tests and perfected with CFD before being refined in ACE's wind tunnel. During the refinement process with ACE, a 'pedalling' mannequin was used to better replicate real-world affects of drag. Giant is the only company in the world to use this dynamic testing environment; where wheels, drive train and the 'rider's' legs are moving to better replicate real-world conditions. This 'system integrated' set up was exposed to a wind speed of 38.6 km/h and rider cadence of 85 RPM, for yaw angles ranging from 0 to 30 degrees. For every iteration.

Different depth rims [42mm front and 65mm rear] are used on the new Propel range because the two differing depths deliver the best balance of aerodynamics and control – in cross winds. The Giant SLR Race 42mm front rim depth isn't severely affected by cross winds, resulting in more steering control for the rider. The rear is about gaining full aerodynamic advantage with its 65mm rim depth. Giant's test facility is located only 2km away from the beach front and extensive testing proves that this is the best combination of rim depth.

So why are discs faster than rim bakes?

Brake calipers placed on the front or behind the fork crown creates more low-pressure air pockets that cause aerodynamic drag. The disc located lower down near the hub is already in a low-pressure zone that is created by the air hitting the leading edge of the front tyre. Giant's new asymmetric front fork further smooth air flow over the disc brake caliper.

We delve into a frame set weight comparison between the new Giant Propel Advanced SL Disc, the old non-disc Propel, and the nearest competitors.

2018 Giant Propel Advanced SL Disc Frame Weight Comparison

The above table illustrates how the new Propel Advanced SL Disc is on 60 grams heavier than a non-disc Canyon Aeroad CF SLX, compared to the Specialized Venge Vias Disc which is 474 grams heavier.

For any racer and experienced road cyclist, efficiency is measured by frame stiffness. How well can the frame resist flexing and twisting under a rider's weight and power? Giant measures this by locking the rear end of the Propel and applying a sideways force to the fork. Results below.

The Propel Advanced SL Disc is 40% stiffer than the Trek Madone, 36% stiffer than its predecessor, 20% stiffer than the Canyon Aeroad CF SLX and 3% stiffer than the Specialized Venge Vias Disc.

In Australia there will be 4 Giant Propel Advanced models.

GIANT PROPEL ADVANCED SL 0 DISC RRP $11,999.00

. Top of the range SL-grade carbon.
. Shimano Dura Ace 9170 Di2 with hydraulic discs.
. Shimano Dura Ace power metre.
. Giant Gavia Race 0 wheels with Giant branded DT Swiss 240 hubs and thru-axles.
. Giant Gavia Race tubeless tyres, 25mm wide.
. Giant SLR (carbon) Aero bar and stem.
. Approximate weight 7.40 kg

 

GIANT PROPEL ADVANCED SL 1 DISC RRP $7,999.00

. Top of the range SL-grade carbon.
. Shimano Ultegra 8070 Di2 with hydraulic discs.
. Giant Gavia Race 1 wheels with Giant branded DT Swiss 300 hubs and thru-axles.
. Giant Gavia Race tubeless tyres, 25mm wide. . Giant SLR (carbon) Aero bar and stem.

 

GIANT PROPEL ADANCED PRO DISC RRP $6,599.00

. Pro carbon.
. Shimano Ultegra 8070 Di2 with hydraulic discs.
. Giant Gavia Race 1 wheels with Giant branded DT Swiss 300 hubs and thru-axles.
. Giant Gavia Race tubeless tyres, 25mm wide.
. Giant SLR (carbon) Aero bar and Contact SL (alloy) stem.

 

GIANT PROPEL ADANCED DISC RRP $4,999.00

. Advanced carbon.
. Shimano Ultegra 8020 mechanical with hydraulic discs.
. Giant Gavia Race 1 wheels with Giant branded DT Swiss 300 hubs and thru-axles.
. Giant Gavia Race tubeless tyres, 25mm wide.
. Giant Contact SL (alloy) aero bar and stem.

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