Eurobike: 2015 Giant Defy Advanced SL

Lightest road frame ever produced by world's largest bike maker

Eurobike Road Bike

Eurobike RoadBikeReview

Eurobike 2015 Giant Defy Advanced SL

Giant’s new, top-of-the-line endurance road bike is disc only and comes stock with Shimano Dura-Ace Di2 shifting, Zipp 202 Disc carbon clinchers, and a $10,300 price tag.

After launching the bike in Scotland in early July, Giant is showing off its impressive 2015 Defy Advanced SL endurance road bike at the Eurobike trade show in Germany. The world’s largest bike maker claims the new frame is the lightest road frame it’s ever produced (890 grams for size medium Defy Advanced SL).

Perhaps more significant is that Giant is going all in with disc brakes, outfitting all eight carbon fiber 2015 Defy models with the burgeoning road braking standard. If you want traditional rim brakes you’ll need to choose from one of five lower-tier alloy models.

Giant claims to have increased compliance primarily through the use of the D-Fuse integrated seatpost in the two Advanced SL models, a design originally used in Giant’s top end TCX cyclocross bikes. The thin D-shaped post is claimed to add 12mm of ride-smoothing flex, but have no effect on power transfer.

Check out the video below to see the integrated seatpost in action.

Once cut, the seatpost has 25mm of adjustment, which Giant feels is adequate to alleviate concerns about resale, a common complaint leveled at integrated post designs. However, that doesn’t solve potential problems of travel or test rides.

Eurobike 2015 Giant Defy Advanced SL Multi

The Giant Defy Advanced SL dampens road vibration with its D-Fuse seatpost. (upper left), has internal cable routing and a built-in speed and cadence sensor (upper right), and comes with Shimano hydraulic disc brakes (lower right) and a Shimano Di2 electronic shifting drivetrain (lower left).

The other composite frame models use a more traditional seatpost binder that has an expander bolt easily be accessed at the top tube. Giant says the ride characteristic of the two systems will vary some, and the non-integrated posts are less stiff and a little heavier.

All the new frames also utilize dramatically thinned compliance-enhancing seat stays, which attach lower on the seat tube. The stays are basically as thin as possible while keeping them hollow, says Giant. By keeping the stays hollow and eliminating the need for a brake bridge, the bike has increased vertical compliance without sacrificing stiffness. Lowering the junction point gives the frame balance. The upper half of the bike is compliant, the lower half maintains stiffness. Ride feel is further enhanced by the stock 25c tires, and Giant claims 28s will fit no problem. You can read our first ride review here.

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This article is part of RoadBikeReviews’s coverage of the 2014 Eurobike trade show in Freidrichschafen, Germany. For more from Eurobike CLICK HERE.

About the author: Jason Sumner

An avid cyclist, Jason Sumner has been writing about two-wheeled pursuits of all kinds since 1999. He’s covered the Tour de France, the Olympic Games, and dozens of other international cycling events. He also likes to throw himself into the fray, penning first-person accounts of cycling adventures all over the globe. Sumner, who joined the / staff in 2013, has also done extensive gear testing and is the author of the cycling guide book "75 Classic Rides: Colorado." When not writing or riding, the native Coloradoan can be found enjoying time with his wife Lisa and daughter Cora.

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  • Gary says:

    Surely they’re joking. An “endurance” bike? I wouldn’t endure 30 seconds with my arse so much higher than the handlebars.

  • bbbbbbb says:

    @Gary seriously?? The seatpost is uncut. When you get the bike you cut it to length. Read the article.

    • Gary says:

      I did read the article and my comment was somewhat rhetorical. Starting with a stratospherically long seat tube and then cutting it sounds like a solution in search of a problem. Seatposts have been adjustable forever and you don’t need a hacksaw to do it. Call me old fashioned.

    • Fai Mao says:

      If a tall guy could not ride the bike without cutting the post then why was it made so long?

      I seriously doubt that anyone could notice the “extra stiffness” or feel the miniscule weight penalty of of an adjustable seat post

      Also Giant cannot violate physics. The bike cannot be compliant and stiff at the same time.

  • MJ12 says:

    If he;s bending the seat post with his hands, how is that supposed to hold up under 200 lb of rider. I don’t trust that, looks like it;d snap.

  • luis says:

    I like adjustable seat posts as well. When I’m ready to sell the frame/bike its still marketable to many riders. These new seat posts are crap and benefit only the bike co.

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