34.9 mm Dropper Post Shaft Clamp Tool

Engineered for modern 34.9 mm oversize dropper shafts. This clamp provides the holding power needed for larger posts, distributing force evenly to protect the anodized finish while you service cartridges and head assemblies.

Why You Need This

• Oversize posts require more torque to service, a firm and even grip is critical.
• Full 360° surface contact minimizes the risk of slip or shaft deformation.
• Protects cosmetics and structure when paired with proper cleaning and technique.

How to Use It Properly

• Clean the shaft thoroughly with isopropyl alcohol, remove all grease, dust, and frame paste residue.
• Wrap once with a clean sheet of paper towel for added friction.
• Spray 1–2 times inside the clamp with alcohol to boost grip.
• Seat the clamp fully around the shaft, avoiding collars, logos, and actuator ports.
• Clamp in the vise evenly and firmly. If it slips, stop and re-prep instead of over-tightening.
• For big diameters like 34.9 mm, review the Big Diameter Clamping Guide before applying torque.

Compatibility

• Most 34.9 mm round droppers, including Fox Transfer 34.9, RockShox Reverb 34.9, OneUp V2 34.9, PNW 34.9, BikeYoke Revive 34.9, KS, and others.
• Round sh