The ride, not just the specs
Gravity is the fun part.
Session is a downhill bike made for bike parks, lift-served days, and the fastest way to the bottom.
It's stable, strong, and built to take the hits, so you can focus on the line.
Trek Session AL Frameset
R1 / Deep Dark Blue to Alpine Blue Fade
$3,399.99
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Trek / Downhill Mountain Bikes
Trek Session AL Frameset
Built for the downhill.
Session AL Frameset gives you the perfect foundation for building your ideal downhill machine. Its high-pivot suspension design keeps you nimble, planted, and fast through the roughest lines, while the burly Alpha Platinum Aluminum frame is built to handle repeated hits on steep, technical terrain.
$3,399.99
What size am I?
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Not currently available from Trek
Questions are welcome. No pressure, no bike jargon required.
- 30-day money-back guarantee Ride it. If it isn't right, bring it back.
- Free adjustments for life On every bike you buy from us.
- Complimentary baseline fit We set the bike up for your body.
What makes it special
Thoughtful details. Big possibilities.
01All speed, no hang-ups
Session’s high-pivot design results in a rearward axle path that lets the back wheel move with the rearward force from bumps, not against it. On the trail, it feels like smoother suspension that maintains more forward momentum and provides more grip.
02Rock the mullet
Session comes stocked for speed with 29er wheels, but party-in-the-back riders can run a mixed set up with a 27.5˝ rear wheel, or even 27.5" front and rear for more agility.
03A better way to produce aluminum
Starting in 2024, we began removing high-emission aluminum from our manufacturing and replacing it with low-emission aluminum made with renewable energy. By October 2025, nearly every alloy bike we make - this one included - had made the switch, driving a major drop in our footprint.
For the detail-oriented
Let's talk bikes.
- Frame Aluminum
- Suspension Full suspension, 200mm
- Wheels 29"
- Weight 12.6 lb
Tap any group to see every part.
Frameset3
- Frame
- Alpha Platinum Aluminum, high main pivot, idler pulley, integrated frame protection, internal or external routing, magnesium rocker link, Mino Link, ISCG 05 2-bolt mount, Active Braking Pivot, 157x12mm thru axle, 200mm travel
- Rear shock
- R1: Marzocchi Bomber, 400lb spring, 250mm x 72.5mm
R2: Marzocchi Bomber, 450lb spring, 250mm x 72.5mm
R3: Marzocchi Bomber, 500lb spring, 250mm x 72.5mm - Headset
- FSA Orbit, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom (includes geometry adjust angled cups)
Wheels & tires1
- Rear axle
- Bontrager Switch thru axle
Cockpit & contact points1
- Seat collar
- Bolt-on, 36.4mm
Weight & limits6
- Weight
- R2 - 5.70 kg / 12.57 lbs
- Weight limit
- This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
- Max tire size
- Frame: 29x2.50", Fork: See manufacturer
- Max rotor size
- Max brake rotor sizes - Frame: 220mm, Fork: see fork manufacturer
- Max chainring
- 36T
- Max fork travel
- 200mm
Good to know3
- Suspension Calculator This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.
- Route it your way Run your cables in whatever custom variation you prefer, externally for easy replacement or internally to prevent snags and hang-ups.
- Hitch without worry Full-coverage armor helps prevent down tube damage from trail debris and makes for worry-free shuttling on tailgates and chair lifts.
Geometry & sizing.
Measurements in cm unless noted.
| Size | R1 | R1 | R2 | R2 | R3 | R3 |
|---|---|---|---|---|---|---|
| Rider height | 5'3"–5'9" | 5'3"–5'9" | 5'9"–6'2" | 5'9"–6'2" | 6'1"–6'5" | 6'1"–6'5" |
| Seat tube (A on the drawing) | 42.5 | 42.5 | 42.5 | 42.5 | 42.5 | 42.5 |
| Seat tube angle (B on the drawing) | 61.0° | 61.0° | 61.0° | 61.0° | 61.0° | 61.0° |
| Head tube length (C on the drawing) | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 |
| Head tube angle (D on the drawing) | 63.0° | 63.0° | 63.0° | 63.0° | 63.0° | 63.0° |
| Eff. top tube (E on the drawing) | 58.7 | 58.7 | 61.8 | 61.8 | 65.3 | 65.3 |
| BB height (F on the drawing) | 35.0 | 35.0 | 35.0 | 35.0 | 35.0 | 35.0 |
| BB drop (G on the drawing) | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 |
| Chainstay length (H on the drawing) | 43.9 | 43.9 | 44.5 | 44.5 | 45.2 | 45.2 |
| Offset (I on the drawing) | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 |
| Trail (J on the drawing) | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 |
| Wheelbase (K on the drawing) | 124.6 | 124.6 | 127.7 | 127.7 | 131.2 | 131.2 |
| Standover (L on the drawing) | 74.7 | 74.7 | 75.1 | 75.1 | 74.9 | 74.9 |
| Reach (M on the drawing) | 44.0 | 44.0 | 46.5 | 46.5 | 49.3 | 49.3 |
| Stack (N on the drawing) | 63.9 | 63.9 | 63.9 | 63.9 | 63.9 | 63.9 |
| Position | Low | Low | Low | Low | Low | Low |
| Wheel size | 29" | 29" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 76.5° | 76.5° | 76.5° | 76.5° | 76.5° | 76.5° |
The Atlanta Cycling difference
The right bike is only the beginning.
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.
What reviewers are saying.
-
“A damn fast bike”
Session allows you to hit sections at ridiculous speeds and commitment levels. It's been nothing but grin-inducing to get to know the Session so far.
pinkbike.com · Read the review
-
“Fastest World Cup DH Bike of 2021”
With 13 wins across World Cup races and the World Champs, Session is leagues ahead of the other bikes that took home victories this season.
pinkbike.com · Read the review
-
“For riders who charge full speed”
A fast, versatile, confidence inspiring downhill bike that will let you push harder and ride faster than you thought you could.
theloamwolf.com · Read the review
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Let's find your next adventure.
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.