Full details and specifications on the Forkmods website.

Tech stuff: PLEASE SPECIFY ISO (26.4mm) OR JIS (27mm) WHEN YOU ORDER or you will be shipped ISO.

Converts ISO and JIS-spec 1"-24 threaded to 1 1/8" threadless (dia. 30.2mm cups, ISO dia. 26.4mm crown race; JIS dia. 27mm crown race).

Sealed steel cartridge bearings with Buna-N dust seals, top and bottom

Uncut threadless steerer tube length: 90mm

Minimum cut length: 38mm (includes 2.5mm for top cap)

Lower stack height: 12.5mm

Upper stack height: 14.6mm

We tried to like the old quill stem, but it flexed and creaked and didn't allow us to use the handlebars we really wanted. Rather than settle for a 31.8mm clamp quill stem or cheap threadless stem adapter and suffer the cosmetic consequences, we decided to design something that solved all of our problems.

It's been through several iterations and a heap of real-world testing and we're now proud to offer classic bicycle owners, (and anyone wanting to convert their 1" threaded fork mountain bike into a gravel bike), a quality solution to modernise their stem and handlebars.

Manufactured from 6061-T6 aluminium and anodised in either clear or black, the Innicycle 1" threaded to 1 1/8" threadless conversion headset is a high quality, beautiful part that lets you run the bars and stem you want. The headset uses low friction dust seals and o-ringed spacers, and there's an M5 thread in the top of the threaded shaft to accommodate different top caps.

How it works: Instead of having an upper threaded race that merely adds bearing preload, the upper race of the conversion headset includes a 1 1/8" tube feature. The upper race is bonded to a quill which acts both as an anchor for the tube like a standard quill stem, as a means of locking out the headset adjustment, and completes the remainder of threadless tube.

Installation/adjustment is as simple as threading on the upper assembly until desired bearing preload is achieved then using a 6mm hex key to tighten the quill. By using the quill in this manner, the standard locknut on a threaded headset is eliminated, and so is the fairly annoying process of adjusting a threaded headset.

The usable quill length as shipped is 90mm. With a typical 40mm clamp region on a threadless stem, you can run 50mm of spacers under the stem to neaten up the look (optional purchase at checkout).

Because this isn't a true threadless system, you don't need the spacers but they do tidy up the appearance and give the stack a uniform diameter.

Our intent is that users will cut the quill to their desired length depending on their chosen stem and spacer stack, just like a normal threadless system would require of the user.