Trek Supercaliber SLR 9.9 XX Flight Attendant Gen 2
Trek / Cross Country Mountain Bikes
Cross-country speed, with a little cushion.
Supercaliber SLR 9.9 XX Flight Attendant is an ultralight XC mountain bike that's built with the top components for race day. Its SLR Mountain Carbon frame is as light as it is meticulous, with a high modulus layup that gives you all the stiffness you crave and none of the weight. XC courses get rowdier every year, so it's equipped with a 110mm fork and 80mm of IsoStrut rear suspension to smooth your roll without dropping pedaling efficiency. It's all topped off with carbon wheels, a carbon cockpit, and SRAM's lightest wireless direct-mount transmission.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Ship to store · free pickup, usually ready in 4–7 business days
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Supercaliber is a cross-country race bike with a touch of rear suspension. It stays light and quick, and takes the edge off the rough sections.
It's the bike for riders who want race speed and a little more comfort over a long day.
What makes it special
Supercaliber’s unique frame design ditches traditional suspension hardware so there’s less weight, less maintenance, and less lateral flex. IsoStrut connects the mainframe to the pivot-less seat stays to offer about 80mm of rear wheel travel. This design offers a unique blend of efficiency, traction, and fatigue-fighting compliance that keeps racers fresh and in control.
IsoStrut integrated suspension gives you just enough travel to stay in control. It's fully tuneable like a standard rear shock, but without the weight penalty of a full suspension bike.
Supercaliber SLR is the World Cup lightweight frame. It drops grams by using a higher modulous carbon fiber layup that allows us to use less material, plus we skip internal guide tubes for cable routing, minimizing material and maximizing weight savings.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | M | ML | L | XL |
|---|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'5"–5'10" | 5'8"–5'11" | 5'10"–6'2" | 6'2"–6'5" |
| Seat tube (A on the drawing) | 39.5 | 42.0 | 44.0 | 46.0 | 52.5 |
| Seat tube angle (B on the drawing) | 70.5° | 71.0° | 71.0° | 71.5° | 71.5° |
| Head tube length (C on the drawing) | 9.0 | 9.0 | 9.0 | 10.0 | 12.5 |
| Head tube angle (D on the drawing) | 67.5° | 67.5° | 67.5° | 67.5° | 67.5° |
| Eff. top tube (E on the drawing) | 57.1 | 59.2 | 60.5 | 62.2 | 66.3 |
| BB height (F on the drawing) | 32.7 | 32.7 | 32.7 | 32.7 | 32.7 |
| BB drop (G on the drawing) | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 |
| Chainstay length (H on the drawing) | 43.5 | 43.5 | 43.5 | 43.5 | 43.5 |
| Offset (I on the drawing) | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 |
| Trail (J on the drawing) | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 |
| Wheelbase (K on the drawing) | 111.3 | 113.8 | 115.3 | 117.2 | 121.7 |
| Standover (L on the drawing) | 76.0 | 77.2 | 77.2 | 77.2 | 77.2 |
| Reach (M on the drawing) | 41.0 | 43.5 | 45.0 | 46.5 | 50.0 |
| Stack (N on the drawing) | 59.0 | 59.0 | 59.0 | 59.9 | 62.2 |
| Wheel size | 29" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 74.5° | 74.5° | 74.5° | 74.5° | 74.5° |
| Front Center | 68.2 | 70.7 | 72.2 | 74.1 | 78.5 |
The Atlanta Cycling difference
Specs matter. But so does how a bike feels when you ride it. Our team is here to help you choose the right size, understand the details, and get comfortable before your first ride.
When you buy from Atlanta Cycling, you're not just getting a box with a bicycle in it. You're getting a 30-day money-back guarantee, a complimentary baseline fit, lifetime basic adjustments, and real people who want you to love every mile.
“A podium contender for any cross country racer”
...this speedster is closer to being the best of both worlds - great pedaling efficiency combined with reasonable comfort and descending capability. Both Vital testers, who regularly race XC and often take on longer endurance rides and events, said they would buy this World Cup-winning bike.
vitalmtb.com · Read the review
“It’s a full-on racer and a very capable one at that”
Trek's new cross country race bike has the speed racers dream of. Everybody who has ridden the new Supercaliber has come away seriously impressed and wants more time on it. After their first ride, one was already calling it the fastest bike he had ridden – that’s saying something given the recent crop of test bikes that have passed through our offices lately.
mbaction.com · Read the review
“Supercaliber is pretty super”
It’s a hoot to ride even when someone isn’t recording with a stopwatch, and it’s far more capable than its modest travel figures would suggest. As the testing progressed, I found myself pushing the Supercaliber harder and harder, and on increasingly challenging terrain.
escapecollective.com · Read the review
Four neighborhood stores. One shared passion.
Ansley. Alpharetta. Roswell. Vinings. Stop by, take a test ride, ask questions, and meet the people who will be here long after your first ride.
