Challenge Seiran headset

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hi, I own a Challenge Seiran with USS, and I've recently discovered that the headset is threadless and, in the absence of a stem or any kind of clamp, there is nothing holding the forks in except the star fangled nut and the top cap bolt.  Having checked out photos of other Seirans, including on the (still existant!) Challenge website, this looks to be standard; the bike handles fine and, in the five months I've had it, the headset hasn't loosened (unlike the one on my upright road bike...).
I have two questions:

     is this indeed standard for this bike?

     should I be worried?

Any answers or other thoughts on this would be gratefully received.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
AndyW Members Profile Send Private Message Find Members Posts Add to Buddy List Visitor (new) Joined: 19 June 2025 Location: Oxon Status: Offline Points: 7	Post Options Post Reply Quote AndyW Report Post Thanks(0) Quote Reply Topic: Challenge Seiran headset Posted: 09 November 2025 at 2:53pm
	Hi, I own a Challenge Seiran with USS, and I've recently discovered that the headset is threadless and, in the absence of a stem or any kind of clamp, there is nothing holding the forks in except the star fangled nut and the top cap bolt. Having checked out photos of other Seirans, including on the (still existant!) Challenge website, this looks to be standard; the bike handles fine and, in the five months I've had it, the headset hasn't loosened (unlike the one on my upright road bike...). I have two questions: is this indeed standard for this bike? should I be worried? Any answers or other thoughts on this would be gratefully received.