Pro Tharsis 100mm Dropper Seatpost with Internal Cable Routing - 27.2/30.9/31.6mm

Discover the exceptional balance of lightweight engineering and dependable functionality with the Pro Tharsis Dropper 100mm Dropper, a premium component designed for discerning riders. This dropper seatpost delivers 100mm of infinite-stop travel, enabling seamless saddle height adjustments to enhance your riding experience across varied terrain. Its internal cable routing not only preserves a sleek, uncluttered appearance but also protects the mechanism from environmental wear, ensuring long-term reliability and performance.

Available in multiple diameters—27.2mm, 30.9mm, and 31.6mm—the Pro Tharsis Dropper is engineered with precision using advanced 3D forged construction tailored to each size. The 27.2mm variant combines an AL6061 alloy lower with an AL7050 alloy shaft and titanium bolts to achieve an ultra-lightweight profile of 405g. Larger sizes incorporate AL7075 lowers paired with AL7050 shafts, delivering robust strength without unnecessary bulk. These features make it a versatile choice for riders seeking both durability and weight efficiency. Explore more from Pro and discover complementary components in our Bike Components collection.

Further refinements include a redesigned 2-bolt saddle clamp that reduces weight by 45g, alongside an oval shaft and improved collar design that save an additional 25g. Whether upgrading an existing setup or building a new bike, the Pro Tharsis Dropper provides smooth, responsive height adjustments that contribute to greater control and comfort on every ride.

Key Features & Benefits

• Infinite-stop 100mm travel: Allows precise saddle height adjustment for optimal riding posture and control.
• Advanced 3D forged construction: Tailored to each diameter for enhanced strength-to-weight ratio.
• Internal cable routing: Protects cables from dirt and damage while maintaining a clean, professional appearance.
• Lightweight materials: Utilises AL6061, AL7050, AL7075 alloys, and titanium bolts for durability without excess weight.
• Redesigned saddle clamp and collar: Weight-saving innovations that improve overall performance and reliability.

What It’s Good For

• Riders requiring precise and effortless saddle height adjustments on technical trails.
• Performance-focused cyclists seeking a lightweight, durable dropper seatpost.
• Compatibility with a range of frame sizes through multiple diameter options.
• Maintaining clean bike aesthetics with protected internal cable routing.
• Enhancing rider control and comfort during variable terrain rides.

What It’s NOT Good For

• Users expecting an integrated lever; the lever is sold separately and must be purchased to complete installation.
• Frames incompatible with the available diameters of 27.2mm, 30.9mm, or 31.6mm.
• Applications demanding dropper travel exceeding 100mm.

Frequently Asked Questions

Is this suitable for different rider sizes or preferences?
The Pro Tharsis Dropper is available in three diameter options—27.2mm, 30.9mm, and 31.6mm—ensuring compatibility with a wide range of bike frames and rider preferences. This variety allows fitting on multiple frame configurations, accommodating diverse sizing requirements without compromising performance.

What key accessories or add-ons complement this model?
To complete the installation and optimise functionality, a compatible lever must be purchased separately, available as Universal (PRSAC0212) or Left-Hand (PRSAC0211) options. Additionally, consider pairing this dropper seatpost with high-quality pedals, helmets, and lighting systems available in our Bike Accessories collection to enhance overall ride safety and comfort.