what is this on my steerer tube?

[efair]

This has six fasteners, I'm wondering if it is "owner adjustable".

 

[Chazmo]

I guess it’s an adjustable stem, @efair . Not at all clear on whether that’s something they expect customers to adjust or not as it looks like you need special tools for it. Not sure.

 

[Base]

Monoshock fork. Those resest bolts are used to let the forks inner shaft glide in the correct angle through the outer steerer tube so you can actually steer with the thing. These bolts overcome the free play when the glide plates/bushings wear out.

 

[Chazmo]

Monoshock fork. Those resest bolts are used to let the forks inner shaft glide in the correct angle through the outer steerer tube so you can actually steer with the thing. These bolts overcome the free play when the glide plates/bushings wear out.

Hey, Base, do you have any instruction video or web link information on this type of suspension. I’d like to understand this better. I did some searching and I also tried to find some information about it on the Gazelle web site but found nothing relevant. Thanks in advance.

Oh, I also reviewed this thread which seemed to be heading in the right direction, but there is an important dead link in there. https://forums.electricbikereview.com/threads/mono-shock-adjustment.52250/

 

[efair]

These posts are incredibly helpful, thanks @Chazmo and @Base. The linked thread above does indeed have some very helpful content.

 

[efair]

The PDF in the above thread explains it well, and includes a picture:

https://forums.electricbikereview.com/attachments/unicon-fork-adjustment-instructions-copy-pdf.152904/

 

[efair]

Synopsis: this front fork is branded "post-moderne", http://postmoderne.com.

 

[Chazmo]

Thanks, guys! Learn something new every day.

 

[efair]

OK, chapter two... since I couldn't discern any movement from my front suspension using my body weight on the bars, I greased it with white lithium and set out to lower the preload. The adjustment is exactly as documented above:

Don't miss the distinction between the five-sided and the hex inside/above it. As the documentation linked above suggests, I found the preload set at the lowest possible setting. Either my expectations about movement are wrong, or there is something else preventing movement. [edit: my expectations were wrong. It's moving, but you can't see the movement unless you're in front of the bike. even at the highest preload, it can be moved by hand]