The Shimano PRO Tharsis 3Five Handlebar[paid link] is a high-performance carbon and alloy handlebar designed for riders who demand stiffness, precision, and control. With its 35mm clamp diameter and optimized layup for trail and enduro use, it’s a favorite among aggressive riders looking for superior handling. However, riders often wonder: Can the Tharsis 3Five Handlebar[paid link] be upgraded or swapped easily? This guide covers everything you need to know about upgrading, compatibility, and best installation practices to ensure your Tharsis 3Five continues to deliver top-tier performance.
Understanding the Tharsis 3Five Handlebar Design
The Tharsis 3Five is built with Shimano PRO’s signature balance of weight savings and stiffness. Available in both carbon and aluminum versions, it features a 35mm clamp interface, which provides additional strength and rigidity compared to traditional 31.8mm bars.
The handlebar’s geometry—typically 800mm wide with a 20mm or 35mm rise—caters to modern mountain bike geometry, offering improved leverage and steering precision. The oversized design enhances front-end control while reducing flex, making it ideal for technical terrain and aggressive riding styles.
When to Consider Upgrading Your Tharsis 3Five Handlebar
Even premium handlebars like the Tharsis 3Five can require upgrading under specific conditions. Common reasons include:
- Fit or Comfort Adjustments: Riders may prefer a different rise or sweep angle to reduce wrist strain or optimize cockpit ergonomics.
- Weight Optimization: Switching from the aluminum to the carbon version can save up to 50–70 grams, improving acceleration and responsiveness.
- Damage or Fatigue: After years of hard riding, especially in enduro or downhill environments, micro-fractures can develop. A replacement ensures continued safety.
- Integration Upgrades: The Tharsis system is designed for internal Di2 and dropper post cable routing. Upgrading may be necessary if switching to a fully integrated cockpit or electronic shifting system.
Compatibility Considerations Before Upgrading
Before replacing or upgrading your Tharsis 3Five Handlebar, you must confirm compatibility with your existing setup.
1. Stem Clamp Diameter
The Tharsis 3Five has a 35mm clamp diameter, so it is only compatible with stems designed for that size. Attempting to use a 31.8mm stem, even with shims, can cause improper clamping pressure and lead to structural failure.
2. Stem Model Matching
For best performance, use the PRO Tharsis 3Five stem[paid link], which shares the same clamping interface and torque specifications. Other compatible stems must support a maximum torque value of 5Nm and provide even pressure distribution across the bar.
3. Control and Accessory Compatibility
Most modern brake levers, shifters, and grips are compatible with the Tharsis 3Five’s 22.2mm grip area. However, if upgrading from older components, verify clamp widths and clearances to avoid interference, especially near the bend area.
4. Internal Routing
The Tharsis 3Five is Di2-ready, featuring internal cable routing channels. When upgrading, ensure your handlebar version matches your drivetrain setup—mechanical or electronic—to maintain cable management efficiency.
Best Practices for a Smooth Upgrade
Proper installation is critical for both performance and safety when upgrading the Tharsis 3Five.
Handlebar Inspection and Preparation
Before installation, inspect the new bar for surface imperfections or shipping damage. Use carbon assembly paste (for carbon bars) on the clamping surfaces to prevent slipping and reduce torque stress.
Torque Settings
Always follow Shimano PRO’s torque recommendations:
- Stem bolts: 5Nm
- Brake lever clamps: 2–3Nm
- Shifter clamps: 2–2.5Nm
Over-tightening can crush the carbon layup, while under-tightening can cause rotation under load. Using a calibrated torque wrench[paid link] is essential.
Cutting for Width
If trimming the bar to a narrower width, use a dedicated carbon or alloy cutting guide to ensure clean edges. Always measure twice and cut once, leaving equal lengths on both sides to maintain balance.
Cable and Hose Routing
For Di2 setups, route wires internally before mounting controls. Ensure no sharp bends or friction points that could damage the cables over time. When routing brake hoses, maintain proper slack for full steering rotation without strain.
Optimizing Performance After Installation
After upgrading, spend time fine-tuning your cockpit. The Tharsis 3Five’s design allows micro-adjustments in angle to optimize wrist alignment and control feel.
- Angle Setting: A neutral angle with slight upward sweep generally provides the best comfort for most riders.
- Grip Positioning: Ensure grips and controls are evenly spaced for consistent handling.
- Test Ride and Adjust: Perform short rides to fine-tune rise and sweep positions before final torqueing.
These refinements can significantly improve comfort and reduce fatigue during long rides.
Comparing Tharsis 3Five to Similar Handlebar Models
When considering upgrades, riders often compare the Tharsis 3Five to similar models like the Race Face Next R 35 or Renthal Fatbar 35.
- Weight: The Tharsis 3Five Carbon is slightly heavier than the Race Face Next R but offers more compliance and damping over rough terrain.
- Stiffness: It provides greater front-end stiffness than the Fatbar, improving high-speed stability.
- Integration: The Tharsis system’s compatibility with PRO stems and Di2 integration gives it a significant advantage in cockpit organization.
Ultimately, the Tharsis 3Five offers a refined balance of stiffness, comfort, and integration that few competitors match.
Safety and Maintenance After Upgrading
Even after a successful upgrade, regular maintenance ensures the longevity and performance of the Tharsis 3Five.
- Inspect the clamping areas monthly for cracks or surface wear.
- Recheck torque settings after 10 hours of riding.
- Avoid using harsh solvents or abrasives during cleaning—use mild soapy water and a soft cloth instead.
- Replace grips and controls periodically to maintain even clamping pressure.
Proper care extends the handlebar’s life and ensures consistent performance under demanding conditions.
Conclusion
Upgrading your Shimano PRO Tharsis 3Five Handlebar can be a worthwhile investment in comfort, safety, and control—especially when done with attention to compatibility and torque precision. Its 35mm system provides unmatched stiffness and handling feedback for aggressive riding styles. By following the correct installation practices and maintaining regular inspections, you’ll ensure that your Tharsis 3Five continues to perform at its best for years to come.