mountainbike portal Jamis Portal C4 — Premium Carbon Full-Suspension Trail Bike – Downrange Bike Works

mountainbike portal Jamis Portal C4 — Premium Carbon Full-Suspension Trail Bike – Downrange Bike WorksExperience trail riding the way it was meant to be with a bike that balances nimble climbing, confident descending, and trail ready durability. The Portal C4 delivers the performance and value you expect from a modern full suspension trail bike, wrapped in a light, high modulus carbon frame thats built to take on Utahs toughest terrain. Key Features & Component Highlights Frame & Suspension: Dyad Pro high modulus carbon fiber frame paired with Jamiss

Experience trail riding the way it was meant to be — with a bike that balances nimble climbing, confident descending, and trail-ready durability. The Portal C4 delivers the performance and value you expect from a modern full-suspension trail bike, wrapped in a light, high-modulus carbon frame that’s built to take on Utah’s toughest terrain.

Key Features & Component Highlights

• Frame & Suspension: Dyad Pro high-modulus carbon fiber frame paired with Jamis’s proprietary 3VO suspension platform. 130 mm of travel gives the sweet spot of efficiency for climbs and compliance on descents. The 3VO linkage delivers a responsive yet stable ride by keeping chain-line and leverage ratio optimized throughout the travel. 

• Fork & Shock: Front suspension handled by a Fox 34 Rhythm Float 29″ fork with 130 mm travel, air spring, sweep-adjust compression, lock-out and rebound adjust for precise control. Rear suspension is managed by a Fox Float DPS Performance Series EVOL shock with 3-position compression, offering a smooth, active rear end on varied terrain. 

• Drivetrain & Gearing: 1×12-speed drivetrain built around a Shimano Deore groupset — including shifter and rear derailleur — for reliable, wide-range shifting. A 32T Race Face Ride crank and a Shimano M6100 12-speed cassette (10–51T) give you the range you need for steep climbs and fast descents. Chain is a KMC X12 12-speed. 

• Brakes: Hydraulic disc brakes from Shimano (MT420, 4-piston), with 180 mm front and 160 mm rear rotors for consistent stopping power even on steep, technical terrain.

• Wheels & Tires: Stans NoTubes Flow D 29″ rims, laced to Shimano MT410 hubs (15×110 mm front, 12×148 mm rear), shod with Vittoria Mazza 29″ × 2.4″ TNT tubeless-ready tires for excellent grip and rolling efficiency. 

• Cockpit & Comfort: Race Face Ride 760 mm handlebar with 20 mm rise and a 50 mm Race Face stem give stable and responsive handling. A KS Rage dropper seatpost with Southpaw remote justifies any trail-side line choice. Saddle is a WTB Volt, and grips are Jamis Lock-On style. 

• Build Purpose: Portal C4 is designed as a do-everything trail bike — light enough to climb efficiently, yet capable enough to tackle technical descents, making it a true do-it-all package for trail riders who want a single bike for most of their rides. 

Why Portal C4 is a Great Fit

If you’re a trail rider looking for a confident, capable bike — whether you’re doing big climbs in the Wasatch, ripping technical descents, or shredding local trails — the Portal C4 offers exceptional value, balanced performance, and trustworthy components. The carbon-fiber 3VO chassis keeps your ride lively and efficient, while the Fox suspension and Shimano drivetrain/brakes give premium-level reliability and performance without overpaying for hype.