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Pro bike: Lars Boom's Rabobank Giant TCX Advanced SL

By:
James Huang
Published:
April 09, 2012, 11:24 BST,
Updated:
April 09, 2012, 12:25 BST
Race:
Paris - Roubaix
Lars Boom (Rabobank) rode this Giant TCX Advanced SL to a sixth-place finish at this year's Paris-Roubaix.

Lars Boom (Rabobank) rode this Giant TCX Advanced SL to a sixth-place finish at this year's Paris-Roubaix.

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This article originally appeared on BikeRadar

This year's Paris-Roubaix saw little more than a few spritzes of rain on the course and yet at least two of the top-ten ran full-on 'cross frames instead of road bikes: second-place finisher Sebastien Turgot (Europcar) and Rabobank rider Lars Boom in sixth.

Boom has won cyclo-cross world championships in the Junior, U23 and Elite ranks and is obviously well-accustomed to riding such a beast. Mud wasn't an issue for this year's running but even so, Boom says he preferred the handling and feel of his Giant TCX Advanced SL on the cobbles over the Defy Advanced SL the rest of the team was riding – the same bike he rode at last year's Paris-Roubaix.

"It feels good so why should I change it?" he told Cyclingnews at the team hotel in Compiègne the day before the start.

Overall, the geometry of the two bikes is similar with identical head and seat tube angles and the same top tube lengths. The TCX chain stays are one centimeter longer, though, and the wheelbase is a substantial 3.5cm longer for extra stability. Giant doesn't publish bottom bracket drops on its web site but we know the TCX measures an unusually tall 55mm – the Defy is almost certainly significantly lower.

Boom says the other major factor in his decision was tire size. While the rest of the team was using 27mm-wide tubulars over the cobbles, Boom was running even bigger 30mm casings with tons of room to spare on account of the more generous frame and fork spacing and Giant's own team-only machined aluminum cantilever brakes.

Boom wouldn't disclose what air pressure he was running – "I'm not going to say!" he told Cyclingnews – but it was especially low even as compared to other bikes at Paris-Roubaix. We estimated approximately 4 bar (60psi) front and rear.

Boom did, however, start on his Defy Advanced SL in Compiègne "to save some energy." Boom says he and the team chose a good location about 80km into the race to make the swap and he rode the TCX into the velodrome later in the day.

Build kit on both bikes was similar aside from the tires and brakes. As did nearly all of the Rabobank team, Boom switched to a mechanical Dura-Ace drivetrain instead of his usual electronic group and 35mm-deep Dura-Ace carbon wheels were the norm. Boom opted for an all-aluminum cockpit from team sponsor PRO and his saddle of choice was fi'zi:k's Antares k:ium.

Total weight for Boom's TCX Advanced SL was an impressive 7.49kg (16.51lb) without bottles.

Full Specifications

Complete bike specifications:

Frame: Giant TCX Advanced SL, size L
Fork: Giant TCX Advanced SL
Headset: FSA Orbit ZS tapered, 1 1/8-to-1 1/4"
Stem: PRO Vibe 7s, 115mm x -6°
Handlebars: PRO Vibe 7s Anatomic, 42cm (c-c)
Tape/grips: PRO
Front brake: Giant custom cantilevers for Rabobank
Rear brake: Giant custom cantilevers for Rabobank
Brake levers: Shimano Dura-Ace STI Dual Control ST-7900
Front derailleur: Shimano Dura-Ace FD-7900
Rear derailleur: Shimano Dura-Ace RD-7900
Shift levers: Shimano Dura-Ace STI Dual Control ST-7900
Cassette: Shimano Dura-Ace CS-7900, 11-23T
Chain: Shimano Dura-Ace CN-7900
Crankset: Shimano Dura-Ace FC-7900, 175mm, 53/44T
Bottom bracket: Shimano Dura-Ace press-fit SM-FC7900P
Pedals: Shimano Dura-Ace SPD-SL PD-7810
Wheelset: Shimano Dura-Ace WH-7900-C35-TU
Front tire: 30mm tubulars (Veloflex?)
Rear tire: 30mm tubulars (Veloflex?)
Saddle: fi'zi:k Antares k:ium
Seat post: Giant TCX Advanced SL integrated
Bottle cages: Tacx Tao (2)
Computer: n/a

Critical measurements

Rider's height: 1.91 m (6' 3")
Rider's weight: 75kg (170lb)
Saddle height, from BB (c-t): 814mm
Saddle setback: 92mm
Seat tube length, c-t: 547mm
Seat tube length, c-c: 537mm
Tip of saddle nose to C of bars (next to stem): 605mm
Saddle-to-bar drop (vertical): 140mm
Head tube length: 175mm
Top tube length: 575mm (horizontal)
Total bicycle weight: 7.49kg (16.51lb)

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