Trek Session AL Frameset 2025
2025 Mountain
Estimate price |
4,303$
Weight | 5.7 kg 
Bike details
Overview
Key information split into simple groups.
Frame summary
-
-
Frame Aluminum -
Travel Rear 200mm -
Suspension Full
Sizing
Recommended size guide.
R1
161cm - 176cm
R1
161cm - 176cm
R2
173cm - 188cm
R2
173cm - 188cm
R3
186cm - 196cm
R3
186cm - 196cm
Parts list
Components
Main components, grouped by system.
Bike components
Frame
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
Size: R1, Marzocchi Bomber, 400lb spring, 250mm x 72.5mm; Size: R2, Marzocchi Bomber, 450lb spring, 250mm x 72.5mm; Size: R3, Marzocchi Bomber, 500lb spring, 250mm x 72.5mm
Wheels
Tires
Frame: 29x2.50", Fork: See manufacturer
Cockpit
Headset
FSA Orbit, sealed cartridge bearing, 1-1/8" top, 1.5" bottom (includes geometry adjust angled cups)
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | R1 | R1 | R2 | R2 | R3 | R3 |
|---|---|---|---|---|---|---|
| Stack Reach Ratio | 1.418 mm | 1.452 mm | 1.343 mm | 1.374 mm | 1.271 mm | 1.296 mm |
| Bottom Bracket Height | 362 mm | 353 mm | 362 mm | 353 mm | 362 mm | 353 mm |
| Front Center | 808 mm | 808 mm | 833 mm | 833 mm | 861 mm | 861 mm |
| Rake | 47 mm | 47 mm | 47 mm | 47 mm | 48 mm | 47 mm |
| Trail | 131 mm | 136 mm | 131 mm | 136 mm | 132 mm | 136 mm |
| Stack | 634 mm | 639 mm | 634 mm | 639 mm | 634 mm | 639 mm |
| Reach | 447 mm | 440 mm | 472 mm | 465 mm | 499 mm | 493 mm |
| Top Tube Length | 586 mm | 587 mm | 617 mm | 618 mm | 652 mm | 653 mm |
| Seat Tube Angle | 61.6 ° | 61 ° | 61.6 ° | 61 ° | 61.6 ° | 61 ° |
| Seat Tube Length | 425 mm | 425 mm | 425 mm | 425 mm | 425 mm | 425 mm |
| Head Tube Angle | 63.6 ° | 63 ° | 63.6 ° | 63 ° | 63.6 ° | 63 ° |
| Head Tube Length | 117 mm | 117 mm | 117 mm | 117 mm | 117 mm | 117 mm |
| Chainstay Length | 435 mm | 439 mm | 441 mm | 445 mm | 448 mm | 452 mm |
| Wheelbase | 1243 mm | 1246 mm | 1274 mm | 1277 mm | 1309 mm | 1312 mm |
| Bottom Bracket Drop | 12 mm | 21 mm | 12 mm | 21 mm | 12 mm | 21 mm |
| Standover Height | 755 mm | 747 mm | 759 mm | 751 mm | 757 mm | 749 mm |
| Wheels | 29" | 29" | 29" | 29" | 29" | 29" |
| Rider Min Height | 161 cm | 161 cm | 173 cm | 173 cm | 186 cm | 186 cm |
| Rider Max Height | 176 cm | 176 cm | 188 cm | 188 cm | 196 cm | 196 cm |