Testing Progress: ISO + Rider FeedbackSuper stoked that ISO testing is finally happening. As it is still ongoing, I’m not ready to publish any results yet, but I can share that the process is actively moving forward. Alongside lab testing, a few select riders have continued putting time on the stem in real conditions. These real-world miles are especially valuable when paired with lab data, and I’m so grateful to everyone who’s been willing to ride prototypes and provide honest feedback.
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The XStem Project is a build-in-public effort to create a modern stem for vintage Cannondale HeadShok bikes and modern setups alike. Subscriber feedback directly influences what gets designed, tested, and produced next, with small-batch parts supporting continued development.
March 2026 XStem Project Update ISO Results Are In The XStem has completed ISO 4210 mountain bike stem validation. Testing included: • Full MTB fatigue cycles (in-phase and out-of-phase)• 1600N and 2600N forward bending stages• 1000N lateral bending• 50Nm torsional security All tests were completed successfully. This wasn’t a parking-lot test ride. These were measured load cases under controlled conditions. Structurally, the XStem meets modern ISO mountain bike stem validation requirements....
Small Part. Bigger Impact. Most of the recent focus has been on the XStem project. Testing, iteration, refinement.That’s still moving forward. But there’s another part of the HeadShok ecosystem that keeps coming up in conversations: Lockout knobs and stem caps. Many originals are cracked.Some are missing entirely.Others are holding on… barely. Before committing to production, I put together a short 3-4 minute survey to understand: • Which fork variants are most common• What condition original...
January 2026 XStem Project Update Welcome to the XStem Project Newsletter. This will be the primary source for progress updates: where things stand, what’s being tested, and what comes next. Thank You + Why This Exists Thank you to everyone who participated in the initial feedback survey last year. Your responses confirmed there is real interest in keeping these bikes on the trail and helped clarify where development effort should be focused. The XStem Project began with a simple problem no...