The lightweight frame and 120mm Travel Fork create amazing performance
Giant didn't create the 27.5 category, but they saw the future and have been leading the industry. Nowhere is that as noticeable as in the new Anthems. Check out these amazing specs:
- ALUXX SL-grade aluminum frame with 4 inches of smooth Maestro suspension
- 120mm-travel Fox Float CTD Performance fork with 15mm thru-axle
- Fox Float CTD Performance rear shock
- Giant P-XC2 rims, Giant Performance Tracker hubs, stainless butted spokes
- Shimano SLX / XT 10-speed drivetrain with Shimano SLX hydraulic disc brakes
From the theBerm.com.au:
What is an Anthem SX?See his very in depth reporting on the Carbon version here.
For 2015 Giant have created two ‘trail’ versions of their Anthem XC race bike and called it the Anthem SX. For those of you unfamiliar with Giant’s Anthem, it’s a 100mm travel full-suspension XC race bike. To create the Anthem SX, Giant took a standard Anthem frame for 27.5” wheels and bolted on a 120mm fork, a remote adjustable seatpost, and a shorter stem – with brilliant results. There’s an aluminium version with a 2X (two chainrings) Shimano drivetrain and Fox suspension that retails for $2999AUD, and the version reviewed here, the $4999 Advanced version that has a 1X SRAM drivetrain and RockShox suspension.
Why 27.5? Giant was ahead on this. They jumped in when the realized the following:
Lighter weightSignificantly lower bike and rotational wheel weight helps you climb faster with less effort.
Overall BikeWeightCompare 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 WeightThe 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 ComparisonStatic wheel weight
Lighter wheels/tires result in a quicker acceleration and lighter overall bike weight - a win-win combination.
2. More efficientSnappier acceleration and a reduced angle of attack for a smoother, more agile ride.
RolloverIncreased 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.