Thursday, 24 November 2016

Tech Talk: Giant TCR Series 2017

Giant Advanced SL

The TCR is an immensely popular road frame with heritage dating back to the 90’s when Giant bikes with compact frames were ridden by the likes of Lauren Jalabert. With a light, stiff and compact design this is a bike designed for racing. There are three models of the disc-equipped TCR - Advanced SL Disc, Advanced Pro Disc and Advanced Disc

Essentially the three models are the same frame in terms of tube profiles and shapes, but the difference is in the grade of carbon used to build the frame, and the headset standard on the entry-level model. The Advanced SL Disc is the lightest in the range and uses the company’s Advanced SL-grade composite, while the two lower models use a cheaper grade of carbon fibre, with the least expensive Advanced Disc using a fork with an OverDrive head tube and fork, not the oversized OverDrive 2 of the two more expensive models.

Hidden seat clamp

More noticeable difference is the regular seatpost on the Advanced Pro Disc and Advanced Disc, whereas the top-end Advanced SL Disc has an integrated seat mast, just like the range-topping Defy Advanced as well. To cater for disc brakes the new bike gets 12mm thru-axles at both ends, the front disc hose is routed externally while the other gear cables and rear disc hose is tidied away inside the frame.

In terms of tech, Overdrive is Giant’s original oversized fork steerer-tube technology. Designed to provide solid front-end steering performance, the system’s oversized headset bearings and tapered steerer tube provide optimal steering stiffness. Road models feature 1 1/8-inch top and 1 1/4-inch bottom bearings, while the mountain version features 1 1/8-inch top and 1 1/2-inch bottom bearings. So. will need a new stem, spacers and upper headset to deal with it.

The top steerer from 1 1/8 (left) and 1 1/4 (right)

Why Giant push the new "standart"? Because Giant claim OverDrive provides up to 15 percent more torsional steering stiffness than straight steerer-tube designs. This translates into much more accurate steering input from a rider’s hands, through the handlebar and stem, and down to the front wheel. Whether hammering uphill or carving through a corner, OverDrive transmits input directly to the front wheel for more precise handling.

After a years, now Giant had Overdrive 2, its an oversized headset bearings (1 1/4-inch top and 1 1/2-inch bottom bearings) and a tapered steerer tube combine for unprecedented steering performance with no additional weight. Why Giant expand it again? Compared to the already stiff OverDrive system, OverDrive 2 provides up to 30 percent more torsional steering stiffness. So we (cyclist) will get a more steering precision.


  • Thru Axle
  • Disc Brakes
  • Integrated Seatpost
  • Overdrive and Overdrive 2 Steerer tube
  • Internal route for cables
  • Giant carbon own materials


Headtube: The head tube is the part of a cycle's tubular frame within which the front fork steer tube is mounted.

Headset: The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of the bicycle frame. A typical headset consists of two cups that are pressed into the top and bottom of the headtube. Inside the two cups are bearings which provide a low friction contact between the bearing cup and the steerer.

Tapered Steerer: A tapered steerer is 1 1/8 inch at the top and 1 1/2 inch at the bottom.


Ride On!

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