Trek

SupercaliberSLR 9.9 XX Flight Attendant Gen 2

Claimed weightM: 10.28 kg / 22.67 lb (with TLR sealant, no tubes)Complete bike

FrameSLR OCLV Mountain Carbon,…RockShox SID SL Ultimate, F…

GroupsetSRAM AXS PodSRAM Eagle XS-1299, T-Typ…

WheelsBontrager Kovee RSL, OC…Bontrager Sainte-Anne RSL X…

Tire clearance61 mm

Trek’s second-generation Supercaliber is a highly focused cross-country race bike designed to bridge the gap between a hardtail and a traditional full-suspension platform. Built around the signature frame-integrated IsoStrut suspension layout, the Gen 2 platform evolves to meet the demands of modern World Cup courses. Rear travel increases to 80 millimeters, paired with a 110-millimeter fork on stock builds, giving the bike a broader capability profile without dulling its pedaling response. For this generation, Trek partnered with RockShox to redesign the IsoStrut unit, aiming for improved sensitivity and easier serviceability. The platform also splits into two distinct carbon frame tiers: the standard SL and the lighter SLR, which omits internal cable guide tubes to shed weight. It remains an uncompromising tool for dedicated racers who prioritize efficiency and speed above all else.

Trek Supercaliber

Build

Size

$15,000See deal

01 / Buy

Where to get it.

1 retailer · size M.

Size

1 retailer · Size M

Brand directTrekBest price

Trek Supercaliber SLR 9.9 XX Flight Attendant Gen 2

In stock

$15,000

02 / Specifications

Spec sheet.

Every component shipped with this build.

01Frameset

4 components

FrameSLR OCLV Mountain Carbon, IsoStrut, UDH, 80mm travel

ForkRockShox SID SL Ultimate, Flight Attendant Race Day damper, Stealth DebonAir spring, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 110mm travel

Rear shockTrek IsoStrut, RockShox SIDLuxe, Flight Attendant RL3 damper

WeightM: 10.28 kg / 22.67 lb (with TLR sealant, no tubes)

02Drivetrain & brakes

10 components

Shift leversSRAM AXS Pod

Rear derailleurSRAM XX SL Eagle AXS, T-Type

CassetteSRAM Eagle XS-1299, T-Type, 10-52, 12-speed

ChainSRAM XX Eagle, T-Type, 12-speed

CranksetSRAM XX SL, Flight Attendant, DUB Wide, 34T alloy ring, 55mm chainline — S/M/ML: 170mm; L/XL: 175mm

Bottom bracketSRAM DUB, 92mm, PressFit

Front brakeSRAM Motive Ultimate 4-piston hydraulic disc

Rear brakeSRAM Motive Ultimate 4-piston hydraulic disc

Front rotorSRAM CenterLine X, CenterLock, round edge — 180mm

Rear rotorSRAM CenterLine X, CenterLock, round edge — 160mm

03Wheels & tires

4 components

Front wheelBontrager Kovee RSL, OCLV Mountain Carbon, Tubeless Ready, CenterLock, Boost110, 15mm thru axle, 29in

Rear wheelBontrager Kovee RSL, OCLV Mountain Carbon, Tubeless Ready, CenterLock, Boost148, 12mm thru axle, 29in

Front tireBontrager Sainte-Anne RSL XR, Tubeless Ready, dual compound, aramid bead, 220 tpi, 29x2.40 (size S–XL)

Rear tirePirelli Scorpion XC RC, Tubeless Ready, Team Edition Pro Wall, aramid bead, 120 tpi, 29x2.40 (size S–XL)

04Cockpit & contact

5 components

StemBontrager RSL Integrated handlebar/stem, OCLV Carbon, -13° — S/M/ML: 70mm; L: 80mm; XL: 90mm

HandlebarsBontrager RSL Integrated handlebar/stem, OCLV Carbon, 0mm rise, 750mm width

SaddleBontrager Aeolus RSL, carbon rails, 145mm width

SeatpostFox Transfer SL, internal routing, 31.6mm — S/M: 100mm; ML/L: 125mm; XL: 150mm

Grips/TapeESI Chunky

03 / Geometry

Geometry & fit.

5 sizes published.

The Gen 2 geometry shifts toward stability without losing its aggressive cross-country posture. Trek slackened the head tube angle to 67.5 degrees and extended the reach, pushing the front center outward to calm the steering at high speeds. To offset the deeper sag of the increased rear travel, the bottom bracket sits slightly higher than the previous generation, which helps maintain ground clearance and reduces pedal strikes on technical climbs.

Despite the longer wheelbase, the bike requires deliberate front-wheel weighting to maintain traction in flat corners. Rider positioning is stretched and low, emphasizing power output. On SLR models, the cockpit features a one-piece Bontrager carbon bar and stem. While this setup saves weight and increases steering stiffness, it prevents riders from adjusting handlebar roll, which may frustrate those with specific ergonomic preferences. To aid descending control, Trek now includes a dropper post as standard equipment across the entire size run, allowing riders to lower their center of gravity and maneuver more freely when the trail points down.

Reach × Stack · size Mmm

Where the handlebar sits relative to the bottom bracket — the single most important fit pair.

01Fit geometry6 values

Stack590 mm

Reach435 mm

Top tube592 mm

Headtube length90 mm

Standover height772 mm

Seat tube length420 mm

02Component geometry5 values

Crank length170 mm

Handlebar width750 mm

Stem length70 mm

Saddle width145 mm

Dropper travel100 mm

03Handling geometry8 values

Headtube angle67.5°

Seat tube angle71°

BB height327 mm

BB drop46 mm

Trail109 mm

Offset43 mm

Wheelbase1138 mm

Chainstay length435 mm

Which size should I buy?

Slide your height to see the recommended size. GearWise's fit algorithm works from the published stack, reach, and ETT — the brand's own recommendation may differ.

Your height

5'8"173 cm

5'0"5'5"5'10"6'3"6'7"

Recommended sizeMBased on stack, reach & ETT for your height · score 68/100.

→Calculated from GearWise's own stack / reach / ETT algorithm — the brand's size chart may recommend a different size, and a proper bike fit beats any calculator.

04 / Other builds

The lineup.

8 builds, ranging $4,800 – $15,000.

The Supercaliber lineup is divided by its two frame tiers. The SL models serve as the entry point, utilizing a slightly heavier carbon layup but featuring molded-in guide tubes that simplify cable maintenance. The premium SLR models shed weight by using higher-modulus carbon and omitting those internal tubes, catering directly to weight-conscious racers.

Mid-range builds equipped with SRAM GX Eagle Transmission are widely considered the value sweet spot, offering robust electronic shifting under load despite a slight weight penalty compared to top-tier groupsets. At the high end, the flagship SLR 9.9 models feature premium RockShox Flight Attendant or Fox Factory suspension, carbon wheels, and SRAM XX or Shimano XTR drivetrains.

A notable spec variation occurs with the tires. While most of the range ships with high-volume 2.4-inch tires that complement the bike's descending capabilities, the absolute lightest flagship builds are specced with narrower 2.2-inch tires to maximize weight savings. Riders frequently swap these out for wider rubber to improve cornering grip and braking traction on loose courses.

— · Currently viewingSLR 9.9 XX Flight Attendant Gen 2

—

$15,000On this page

—SLR 9.9 XTR Di2 Gen 2

—

$11,500

—SLR 9.8 X0 Flight Attendant Gen 2

—

$10,000

—SLR 9.8 X0 AXS T-Type Gen 2

—

$9,000

—SLR 9.8 XT Di2 Gen 2

—SL 9.7 GX AXS T-Type Gen 2

Closeout; multiple prices shown

05 / Reviews

From the press.

17 reviews from the cycling press.

Reviewers consistently praise the Supercaliber for its exceptional pedaling response and climbing speed. The high anti-squat kinematics and structural rigidity of the IsoStrut design translate power immediately, delivering an "ego boosting pedal response" (Mountain Bike Rider) that excels on steep pitches and sprints. While the suspension is highly effective under power, multiple testers noted that the RockShox-made IsoStrut requires a bedding-in period. Out of the box, the rear end can feel harsh until the seals and bushings loosen up, sometimes requiring additional lubrication to achieve its intended sensitivity.

Once broken in, the suspension provides excellent seated traction and feels "taut and reactive" (BikeRadar) over trail chatter, though it remains a firm race tune. On descents, the updated platform is noticeably more stable than its predecessor. The chassis rigidity translates to "pinpoint magic" (Feedthehabit) in smooth corners, allowing riders to hold tight lines with minimal steering lag. However, testers caution that the short travel limit is still apparent on rougher terrain. Pushing the bike into chunky rock gardens or flat landings can result in a harsh bottom-out. Ultimately, reviewers agree that the bike retains its "ruthless efficiency" (Flow Mountain Bike), rewarding aggressive, precise riders while feeling unforgiving if the pace drops or the trail becomes excessively rowdy.