QX100 headset: alternative to FIRST BI-3

veloc_h · Apr 22, 2025

FIRST BI-3 is a combination of locking headset spacer and adjustable spacer. i can't buy the BI-3 (and honestly I'm not keen on this fragile construction) in Switzerland or in Germany:
In https://forum.cruzbike.com/threads/diatech-headset-adjustment.8585/post-161444 the problem solver combination 9970 and 9974 was mentioned. Does it work with the QX100?

Robert Holler · Apr 23, 2025

That should indeed work in combination with a regular headset. It is pretty much the same combo that is now used on the current T50. Though that iOS an OEM version and not the Problem Solvers brand.

Robert

veloc_h · Apr 24, 2025

I've added the factory's link:

Locking Headset Spacer

Locking spacers keep the fork in place when the top cap and stem are removed. This is useful for a multitude of reasons: maintaining headset adjustment when switching stems, displaying frame/fork combinations, shipping bikes, etc. Locking Headset Spacer Instructions

problemsolversbike.com

Adjustable Headset Spacer

Are you dialing in the fit of your bike and want to get everything set before you cut your steerer tube? This is the part for you! This spacer will let you set the headset preload without installing a star nut so you can fine tune everything first. After installing your headset spacers and stem...

problemsolversbike.com

FIRST told me, that the BI-3 is not any longer offered.
Thanks a lot for your prompt feedback, @Robert Holler

veloc_h · Apr 24, 2025

Robert Holler said:
It is pretty much the same combo that is now used on the current T50.

which brand/type is used on the current T50?
The problems solver combi is not deliverable (I can order the adjustable spacer online in Germany, but not the locking spacer). There is a shop in the Netherlands, but they don't deliver to Germany or Switzerland.

Robert Holler · Apr 24, 2025

veloc_h said:
which brand/type is used on the current T50?
The problems solver combi is not deliverable (I can order the adjustable spacer online in Germany, but not the locking spacer). There is a shop in the Netherlands, but they don't deliver to Germany or Switzerland.

Hmmm. It is basically the same thing, just "ungraded OEM" so not an item that is available to consumers as it is only provided to manufacturing sector. The Problem Solvers as a "Brand" is a QBP (Quality Bike Parts) named/branded line for them as a distributor. It is probably made by the same company.

I have not seen any clone versions of it.

The locking spacer - there is a similar thing by Trek - the Knock Block Headset Lockring Spacer

Trek Knock Block Headset Lockring Spacer - Trek Bikes

www.trekbikes.com

veloc_h · Apr 25, 2025

Ok, the Trek 545523 knock block lockring spacer 1 1/8'' is an altenative, thanks!
Edit: in the meantime I have disassebled the bits and pieces: the FIRST BI-3 is not broken. My apologizes! But the gap of the spacer for the screw to push together is nearly zero. Probably worn out (woehler diagram: not any longer the elastic stage...).
Could I use an ordinary double saddle clamp like these one: