Giant has redesigned the Propel for 2018, introducing several new models including the Propel Advanced Disc we have here, priced at £2,999. Rim brake versions of the Propel have been in the Giant line-up for years but this is the first time that disc brakes have been added.
Check out our news story from when Giant first revealed its Propel Disc aero road bikes.
In Giant’s world ‘Advanced’ means that a frameset is made from carbon-fibre. The Propel Advanced SL Disc is the top-end platform, then you get the Propel Advanced Pro Disc, made from a lower grade of carbon, and then there’s this one, the Propel Advanced Disc, with carbon that’s different again.
Giant says that the Propel Advanced Disc lineup had a development phase of three years involving its in-house engineers, Team Sunweb pro racers and aerodynamics experts at the Aero Concept Engineering facility in Magny-Cours, France. They used a moving mannequin on the bike in the wind tunnel, with spinning cranks and wheels, and they tested yaw (apparent wind) angles up to 30 degrees. They claims this results in the most accurate aerodynamic analysis possible.
The results to the lineup are:
• New frame profiles
• An integrated disc-brake design
• New aero handlebar and stem system
• Internal cable routing
• Aero wheelsets with different rim depths front and rear (the idea being to reduce drag without compromising control or power transmission).
One of the key features is a new truncated ellipse airfoil shape that’s used on the frame. The profile is designed to reduce drag at a wide range of wind angles, and it’s cut off square at the back to save weight, stick within the UCI rules, and make sure the bike doesn’t handle poorly in crosswinds. The idea is that, in terms of aerodynamics, the wind acts almost as if the tube profile tapered off gradually. Lots of other manufacturers do something similar with their aero tubes.
Interestingly, Giant says that with proper integration, a disc-brake design can actually improve aero performance over a rim-brake setup. That’s a significant claim in that one of the arguments often put forward against disc brakes is that they increase drag.
“This is because the location of traditional callipers (either in front or behind the fork crown/ legs) creates ‘dirty’ air,” says Giant. “Opening up the fork crown area (by placing the disc-brake callipers down at the hub) means that the air hitting the new disc-brake calliper has already been disrupted by the leading edge of the tyre/wheel. This effect is further enhanced by an asymmetric fork that helps smooth out airflow over the calliper.”
Like most disc-equipped road bikes these days, all of the bikes in the Propel Advanced Disc range use Flat Mount disc brakes. The wheels are held in place by thru axles front and rear.
The new Contact SL Aero handlebar/stem system was designed with internal cable routing for better aerodynamic efficiency.
Our review bike came fitted with a large stack of spacers, but you can reduce the height in the usual way by removing a few of them and chopping down the fork steerer. It’s only the leading part of that stack that’s actually made up of spacers, the rear part is a rubber shroud that hides the cables away.
The Propel Advanced Disc features Giant’s own SLR 1 Disc wheelset. The rear wheel has a 65mm deep rim, the idea being to provide of aero efficiency and power transmission, while the front wheel has a shallower 42mm rim for improved crosswind stability. These wheels are matched with Giant’s Gavia tubeless tyres.
Giant Propel Advanced Disc is built up with Shimano’s Ultegra groupset with a 52/36-tooth chainset and an 11-28 cassette, which sounds like a setup that would suit this kind of bike. Everything else on the bike is Giant’s own, including the Giant Contact saddle.
An aero bike isn’t really about weight but our M/L model hit the scales at 8.48kg (18.7lb).
We’re really interested to find out how the Propel Advanced Disc bike performs on the road, and that’s exactly where we’re taking it. Look out for a review on road.cc soon.
10 thoughts on “Video first look: Giant Propel Advanced Disc”
I wouldn’t fancy crashing and
I wouldn’t fancy crashing and landing on that stem.
Broady. wrote:
The brake rotors will surely sever all your limbs in a crash, this thing is a death trap!
Seems that a few bike
Seems that a few bike companies are competing for ugliest bike of the year at the moment. We’ve got some real corkers and it’s only March
This is ugly, so ugly.
This is ugly, so ugly.
2018 is going to be looked back on at the year the Giant Propel Disc and Canyon Grail were released.
8.48 kg for an aero disc bike though? When the Canyon Aeroad disc is about 7.5kg depending on build.
Funilly enough I was just in
Funilly enough I was just in the Giant store in St Pauls over my lunchbreak – been looking at a
Giant Propel Advanced Sl 1 Disc as an option for my fourtieth.
They look a lot better in the flesh I’d say, and the pictured model above is an awful paint job compared to some of the others in the range.
sergius wrote:
You already have 39 bikes ?….. blimey..
fukawitribe wrote:
I take N+1 overly seriously.
I still can’t get over that
I still can’t get over that paint job. Looks like a children’s toy you get in a cereal packet.
….I’ll stick my neck out.
….I’ll stick my neck out. I would give serious thought to a Giant as my next bike (though would find it difficult to look past the Cento10Air if I was in the market for an aero). But this bike looks great and Giant offers serious VFM. If it’s good enough for Tom Dumoulin….
That is minging. I know
That is minging. I know beauty is in the eye of the beholder but I think this is one of the most beautiful bikes around right now:
https://www.speedvagen.com/ready-made-og-classic/