Industry Nine Hydra 2 Enduro Alloy System Wheelset
The Hydra 2 Enduro Alloy System is Industry Nine's most popular wheel for "Big Mountain" and Enduro riding. Built with the Enduro 300 rim (formerly the EN305), this wheelset is designed to take the edge off rough trails while maintaining enough lateral stiffness for precise cornering. The latest model benefits from the Hydra 2 overhaul, focusing on making the hub "bombproof" for the most demanding riders.
The Enduro 300 alloy rim features the Hollow Bead Wall technology. By doubling the width of the bead edge, I9 has created a "buffer" that protects your tyres from pinch-flats during hard bottom-outs. Internally, the Hydra 2 hub now features a 65% thicker axle and larger 6903 bearings, specifically engineered to withstand the 120Nm of torque generated by modern E-Enduro bikes without sacrificing the legendary instant engagement.
The Industry Nine Hydra 2 Enduro Alloy System wheelset remains the "sweet spot" for aggressive mountain bikers and E-MTB riders. It provides the signature stiffness and custom looks of I9’s aluminium system spokes but at a more accessible price point than the carbon options.
For 2026, the big update is the transition to the Hydra 2 hub across the entire system range, bringing even faster engagement and significantly improved durability for high-torque motors.
Customsiation through Industry Nine's Anolab:
Simply go to the Anolab here and build your preferred wheelset. Add it to theIndustry Nine cart (don't worry about price etc, we are just after the code their builder generates) get their custom code such as in the picture below. Pop this code into the comments box when ordering from us and we can make sure you get what you are after. Any problems get in touch and we can do it for you.
Our Wheelbuilders' opinion:
The Enduro Alloy System is widely considered the "Goldilocks" wheelset. It is significantly more responsive and lighter than the "S-Series" (steel spoke) wheels, but it offers a more compliant and "muted" trail feel than the Carbon System wheels. For the high-torque EMtb's, the extra "give" of the alloy rim can actually provide better traction on loose, technical climbs compared to the ultra-stiff carbon alternative.
870 Points of Engagement: A near-instant 0.41-degrees engagement for technical climbing and "ratcheting" through tight sections.
Direct-Thread Aluminium Spokes: oversized 7075-T6 spokes thread directly into the hub shell, eliminating the nipple and the J-bend for a stronger, stiffer wheel.
Reduced Coasting Drag: New labyrinth seals and refined pawl geometry provide a 60% reduction in drag compared to the original Hydra.
Full-Power E-Bike Rated: The reinforced Hydra 2 internals are fully certified for "Full Power" Class 1 E-bikes.
Hand-Built in Asheville: Machined, anodised, and assembled in North Carolina, USA
| Specification | Detail | Notes |
| Rim Material | Enduro 300 Aluminum | High-strength alloy with Hollow Bead Wall. |
| Internal Width | 30.0mm | Optimized for 2.3"�2.8" tyres. |
| Engagement | 0.41? (870 P.O.E.) | 6-pawl phased system; 145t drive ring. |
| Spoke Type | Direct-Thread Aluminium | One-piece 7075-T6; 32 spokes per wheel. |
| Brake Mount | 6-Bolt Only | System-hubs are 6-Bolt exclusive. |
| Set Weight (29") | 1825g | (840g Front / 985g Rear). |
| Set Weight (27.5") | 1725g | (785g Front / 940g Rear). |
| Max Rider Weight | 132kg (290lbs) | Combined rider and bike weight. |
| Freehub Options | SRAM XD, MS, HG | Tool-free swapping between driver bodies. |
| Specification | Detail |
| Rim Material | Enduro 300 Aluminum |
| Internal Width | 30.0mm |
| Engagement | 0.41? (870 P.O.E.) |
| Spoke Type | Direct-Thread Aluminium |
| Brake Mount | 6-Bolt Only |
| Set Weight (29") | 1825g |
| Set Weight (27.5") | 1725g |
| Max Rider Weight | 132kg (290lbs) |
| Freehub Options | SRAM XD, MS, HG |
| Specification | Notes |
| Rim Material | High-strength alloy with Hollow Bead Wall. |
| Internal Width | Optimized for 2.3"�2.8" tyres. |
| Engagement | 6-pawl phased system; 145t drive ring. |
| Spoke Type | One-piece 7075-T6; 32 spokes per wheel. |
| Brake Mount | System-hubs are 6-Bolt exclusive. |
| Set Weight (29") | (840g Front / 985g Rear). |
| Set Weight (27.5") | (785g Front / 940g Rear). |
| Max Rider Weight | Combined rider and bike weight. |
| Freehub Options | Tool-free swapping between driver bodies. |