PORTAL A2
Jamis
Trail
PORTAL A2 is an alloy trail mountain bike (2024), by Jamis, from the Portal lineup. This setup will suit 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. The main strengths in the metrics are strong climbing friendliness for sustained uphill riding, a balanced ride feel between comfort and directness, and good fit flexibility for dialing in rider position. At the same time, compared with more specialized alternatives, the compromise is less emphasis on outright speed than speed-focused builds and a value score that depends more on priorities than pure price efficiency. Compare this bike with other trail bikes on MatchBikes.com.
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 | 1.504 mm | 1.45 mm | 1.401 mm | 1.356 mm | 1.315 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 | 597 mm | 606 mm | 615 mm | 625 mm | 634 mm |
| Reach | 397 mm | 418 mm | 439 mm | 461 mm | 482 mm |
| Top Tube Length | 560 mm | 585 mm | 610 mm | 635 mm | 660 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 | 437 mm | 437 mm | 437 mm | 437 mm | 437 mm |
| Wheelbase | 1122 mm | 1148 mm | 1173 mm | 1198 mm | 1224 mm |
| Bottom Bracket Drop | 33 mm | 33 mm | 33 mm | 33 mm | 33 mm |
| Standover Height | 731 mm | 754 mm | 749 mm | 754 mm | 774 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 |




























































