PORTAL A2
Jamis
Trail
PORTAL A2 is an alloy trail mountain bike (2023), by Jamis, from the Portal lineup. It is a strong match for a wide range of riders thanks to its fit flexibility, with a balanced riding position, and is well suited to natural trails and mixed off-road terrain. Standout strengths from the metrics include strong climbing friendliness for sustained uphill riding, a balanced ride feel between comfort and directness, and good fit flexibility for dialing in rider position. The main limitation versus more focused builds is less emphasis on outright speed than speed-focused builds and a value score that depends more on priorities than pure price efficiency. Use MatchBikes.com to compare this bike with nearby trail options.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
Geometry
| Measurement | XS | SM | MD | LG | XL |
|---|---|---|---|---|---|
| Stack Reach Ratio | 1.5 mm | 1.45 mm | 1.4 mm | 1.35 mm | 1.31 mm |
| Bottom Bracket Height | 341 mm | 341 mm | 341 mm | 341 mm | 341 mm |
| Front Center | 687 mm | 713 mm | 738 mm | 763 mm | 789 mm |
| Rake | 51 mm | 53 mm | 53 mm | 52 mm | 53 mm |
| Trail | 100 mm | 98 mm | 98 mm | 99 mm | 98 mm |
| Stack | 599 mm | 608 mm | 617 mm | 627 mm | 636 mm |
| Reach | 399 mm | 420 mm | 441 mm | 463 mm | 484 mm |
| Top Tube Length | 562 mm | 587 mm | 612 mm | 637 mm | 662 mm |
| Seat Tube Angle | 74.5 ° | 74.5 ° | 74.5 ° | 74.5 ° | 74.5 ° |
| Seat Tube Length | 368 mm | 394 mm | 432 mm | 483 mm | 533 mm |
| Head Tube Angle | 67.5 ° | 67.5 ° | 67.5 ° | 67.5 ° | 67.5 ° |
| Head Tube Length | 95 mm | 105 mm | 115 mm | 125 mm | 135 mm |
| Chainstay Length | 439 mm | 439 mm | 439 mm | 439 mm | 439 mm |
| Wheelbase | 1124 mm | 1150 mm | 1175 mm | 1200 mm | 1226 mm |
| Bottom Bracket Drop | 33 mm | 33 mm | 33 mm | 33 mm | 33 mm |
| Standover Height | 733 mm | 756 mm | 751 mm | 756 mm | 776 mm |
| Wheels | 29" | 29" | 29" | 29" | 29" |
| Rider Min Height | 156 cm | 163 cm | 171 cm | 179 cm | 185 cm |
| Rider Max Height | 166 cm | 174 cm | 182 cm | 189 cm | 195 cm |




























































