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XTC Advanced 27.5

XTC ADVANCED 27.5

Ready to rip? Meet the superlight, ultra-efficient hardtail that's used by Giant XC pros for fast World Cup courses. When every gram, pedal stroke and ounce of control matter most, this is the choice.

Tech Highlights

Show Highlights

1

OVERDRIVE 2

Designed to offer unprecedented front-end steering performance, the system’s oversized headset bearings (1-1/2” lower, 1-1/4” upper) and tapered steerer tube work in harmony to provide supreme steering stiffness.

2

PowerCore

A massively oversized bottom bracket/chainstay area features a fully integrated, 86mm-wide BB design. Asymmetric chainstays provide additional stiffness on the driveside and stability on the non-driveside.

3

Megadrive

The precisely engineered, rectangular shaped downtube yields unprecedented steering and pedaling stiffness.

4

27.5-specific geometry

XC frame geometry tailored for 27.5-inch wheel size hardtail to optimize acceleration, control and stability.

5

Internal cable routing

Frame features unique internal cable porting for sleek, uncluttered appearance and performance.

6

Internal Seatpost Clamp

Lightweight, all-internal seatpost locking mechanism provides clean, confident clamping force where it is needed most.

7

142/135mm Convertible Rear Thru-Axle Design

142/135mm convertible rear dropouts let riders choose which format works best for their needs.

Handcrafted with Giant's Advanced-grade composite, and purposefully engineered for the fast, stable 27.5-inch wheel platform, the all-new XtC Advanced 27.5 is the perfect balance of speed and control.

OVERDRIVE 2

Designed to offer unprecedented front-end steering performance, the system’s oversized headset bearings (1-1/2” lower, 1-1/4” upper) and tapered steerer tube work in harmony to provide supreme steering stiffness.

PowerCore

A massively oversized bottom bracket/chainstay area features a fully integrated, 86mm-wide BB design. Asymmetric chainstays provide additional stiffness on the driveside and stability on the non-driveside.

Megadrive

The precisely engineered, rectangular shaped downtube yields unprecedented steering and pedaling stiffness.

27.5-specific geometry

XC frame geometry tailored for 27.5-inch wheel size hardtail to optimize acceleration, control and stability.

Internal cable routing

Frame features unique internal cable porting for sleek, uncluttered appearance and performance.

Internal Seatpost Clamp

Lightweight, all-internal seatpost locking mechanism provides clean, confident clamping force where it is needed most.

142/135mm Convertible Rear Thru-Axle Design

142/135mm convertible rear dropouts let riders choose which format works best for their needs.

Technologies

OverDrive 2

THE EVOLUTION OF CONTROL

Read more

Advanced Composite

HIGH-PERFORMANCE GRADE

Read more

27.5 Technology

RIDE WITHOUT LIMITS

Read more

OverDrive 2

THE EVOLUTION OF CONTROL

Read more

Advanced Composite

HIGH-PERFORMANCE GRADE

Read more

27.5 Technology

RIDE WITHOUT LIMITS

Read more

Video

27.5 Technology

Superior performance without compromise. These are the reasons to ride Giant 27.5.

1. Lighter weight

Significantly lower bike and rotational wheel weight helps you climb faster with less effort.

Overall Bike Weight

Compare the weights of identically equipped bikes with different wheel sizes and you'll see substantial weight differences. As expected, the 26-inch-wheel bike is somewhat lighter than the 27.5, and substantially lighter than the 29 (up to two pounds of overall bike weight savings from 29 to 27.5). Every gram saved helps you ride faster.

Wheel/Tire Weight

The overall weight of a 27.5 wheel set (wheel, tire and inner tube) is only 5% greater than that of an identically built 26-inch wheel set. Compare this to the 12% increase of a 29-inch wheel set and you can see how a seemingly small increase in diameter results in substantial weight gain—and poorer performance when climbing or accelerating.

Weight Comparison

Static wheel weight
Lighter wheels/tires result in a quicker acceleration and lighter overall bike weight - a win-win combination.

2. More efficient

Snappier acceleration and a reduced angle of attack for a smoother, more agile ride.

Rollover

Increased wheel diameter decreases the angle of attack (the angle in which a round object intersects a square object). This is a good thing. A 29-inch wheel rolls over a 6-centimeter square-edge obstacle 14% more efficiently than a 26-inch wheel does. In comparison, a 27.5-inch wheel rolls over the same obstacle 9.8% more efficiently than a 26-inch wheel does.

Another way to analyze angle of attack is the degree of impact—where 26-inch equals X degree, 27.5 equals X-4 degrees and 29 equals X-6 degrees. Again, a shallower angle is better—so 29-inch takes the win, with 27.5 exhibiting nearly the same performance but without the weight penalty.

Acceleration

Arguably the most important benefit of 27.5 over 29 is quicker acceleration. This is the "snap" that a rider feels when they push hard on the pedals. It is affected not just by overall static weight but also where the weight is distributed throughout the wheel. The farther the weight is from the center of the hub, the slower the acceleration. So a similarly constructed 1000-gram 29-inch wheel is slower to accelerate than a 1000-gram 26-inch wheel—because the larger diameter rim and longer spokes place weight farther from the hub. The key to snappy acceleration is minimizing the weight of the outermost components (rim, nipples, spokes, tire, tube). As you can see, a 27.5-inch wheel is only 1.5% slower to accelerate than a similarly constructed 26-inch wheel, but a 29-inch wheel is 3.6% slower than a similarly constructed 26-inch wheel.

3. Better Control

A larger tire contact patch, increased stiffness, and optimized frame geometry improve traction, braking and handling.

Traction

The larger the diameter of a wheel, the greater the contact patch of the tire. A larger contact patch results in better traction, which leads to improved acceleration, deceleration and cornering. As you can see, a 27.5-inch wheel has a similar contact patch to the 29.

Frame Stiffness

Lateral (side-to-side) frame stiffness can be affected by wheel size. To accommodate larger wheels, frame dimensions must be elongated. Therefore, a size medium 29-inch wheel frame has more lateral flex (bottom bracket and headtube) than a size medium 27.5 or 26-inch wheel frameset. Additional flex compromises handling under heavy pedaling or sharp cornering.

Frame Geometry

The larger the wheel, the more difficult it is to optimize geometry, especially on smaller frames. As the frame size decreases, headtube heights become higher (in relation to saddle height). On 26 or 27.5-inch frames, it's less of a problem, but geometry limitations can affect smaller 29-inch-wheel frames.