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A while ago I acquired a fully carbon fork with a carbon steerer. I've taken this picture from an active Aliexpress listing that should be equal to the fork in my possession, and ran it through Google Translate.

enter image description here

Thinking I could modernize my old steel road bike whose threaded fork is rusty and bent, I've started searching for the parts to make the conversion. Handlebar, stem, 1" to 1-1/8" shim, spacers, a crown race (I am hoping a 26.4 ISO race fits, as the crown race seat actually measures out to 26.4, despite the 26.2 advertised) and headset and ... expansion plug?

I can't seem to find a steerer plug that's narrow enough to fit in this fork. I've seen some plugs advertised as narrow as 21 mm but that is exactly as narrow as the fork inner diameter, at least as advertised in the photo above (which does not account for variances in Aliexpress measurement or QC). And even then those plugs have a length of at most 30 mm, which is shorter than I'd be comfortable riding with.

I have a hard time believing these forks are being sold but the accompanying hardware isn't. Am I looking for the wrong keywords? Is there perhaps a way to make my own steerer plug from some readily available parts?

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  • What is the use case for this bike? Commented yesterday

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1" carbon steerer tubes were a rare item. I had a 2001 or 2002 (not sure) Giant TCR frameset with a 1" carbon steerer. The model year immediately after that switched to 1-1/8". I can't attest to what the third party sellers on Aliexpress are thinking, but we do know that many of them are resellers, and quality control is not necessarily a thing among the resellers or whatever factories they get their stuff from.

I believe that Wound Up Composites is the only firm in the West (excluding Japan, whose market is more opaque due to language barriers) making a 1" carbon steerer fork. On their site, they currently list a 1" compression plug made by FSA. Profile Design may or may not have a plug also compatible with a 1" carbon steerer.

If I were looking to replace a 1" threaded steel fork, I would either get the Wound Up fork, which may have a lead time as it's made to order, or I'd look for a 1" steel fork. Soma Fabrications appears to sell one model, for example. I realize the Wound Up article is possibly 3x the price of the Soma. This is where it becomes a personal choice. If the frame has that much sentimental value, then one perspective would be why not splurge. Another perspective is that a steel frame with a 1" steerer can only be modernized so far, and the marginal benefit of something like a Wound Up fork versus a well-made steel fork is not necessarily that large - I think I can speak from experience on this one, having a retro-modern-ish steel frame (albeit made in 2007) that has fairly modern components but it has a 1" steel fork (and stem).

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If you ride an unknown carbon fork from the "Big Rock Candy Mountain" you have a lot more serious things to worry than the compression plug depth. The fork is one of the most critical safety components in your bike along with the stem and handle bars and it's made of material that is known for immediate catastrophic failures. When carbon fails, it can easily go from 0 to 100 in a fraction of a second and the fork fails when you're really feeling the need to slow down from 30mph to zero ASAP. Steel may have a higher probability to give you a warning. This is the component where you want to invest in safety and quality.

If you have a good steel bike, get a new good steel fork for it. Don't fall for the carbon craze. You have to race really seriously to need carbon. File the amount you've spent already on "tuition costs." We all have that account and we're all ashamed to say the total...

But if you still want to go forward with this, get that 21mm plug and if it's too big you should be able to plug it into a drill and sand it down a tenth of a millimeter to make it fit.

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I have used and fitted many 1" A-head carbon forks, but they were all one type: Columbus Minimal.

The Columbus 1" expander bung is both supplied with the fork and is available by itself. I have one at the shop if you would like the specific dimensions.

Most other 1" carbon forks are discontinued now.

enter image description here fork

expandcr

The silver part is ca. 20mm and the total depth into the fork steerer is 30mm. The minimum diameter it will fit is about 20.5mm - 20.75mm.

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