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Threaded suspension forks

Old 04-27-21, 09:52 AM
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sloar
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Threaded suspension forks

Are there any decent threaded suspension forks? Iíve got a really nice 1996 Trek 8000 ZX that has a rigid fork. The Trek brochure states that these were designed to take a front shock if desired. I actually want to use this for trail riding, itís light and crazy fast. I think it will be a blast.







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Old 04-27-21, 12:12 PM
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Best bet is to get a threadless suspension fork. Not easy to find in 1-1/8” straight steerer, 26” rim brake. Bikes are not made for threaded or threadless, forks are.

First take measurements of your current height and reach. After you have found a threadless fork, stem, headset, and spacers, remove your rigid, stem, headset and store it away for down the road. If the threaded headset is bad, buy a replacement.

Put it together and go ride.

John
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Old 04-27-21, 06:19 PM
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First confirm the steerer size.

There were 1in threadless suspension forks. But not for long.

There were also 1-1/8 threaded forks. That's a reasonable swap with a headset change, they were produced in huge numbers for decades, and there are maybe a few new ones still available with canti bosses.
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Old 04-27-21, 08:03 PM
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The 1996 Trek Tech Manual gives an odd designation for the headset as 25.4/34.0/30.0 with a stack height of 34.4mm or 25.5mm (SHX). This is for both the 8000 and 8000SHX (suspension). The 25.4/34.0/30.0 is the same as my 1995 Trek and it is definitely a 1-1/8" straight steerer.

But I think I've figured what that 25.4 means. It is the ID of the steerer that would be typical for threaded 1-1/8" steerers that need a 25.4mm quill stem. But they used the same designation for threaded and threadless, except the steerer length is about 40mm longer on the threadless suspension fork.

In passing, there are a number of threads on Google on Trek and Bontrager 25.4/34.0/30.0 headset designation and no one knows what the 25.4mm means. But before threadless became the dominant headset setup, ID was used for the size of quill stem. The 1995 Trek 800 has a headset of 22.2/30.0/27 which is probably a good indicator that the first dimension is steerer ID.

John

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Old 04-28-21, 06:50 AM
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Thanks
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Old 04-28-21, 08:42 AM
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Get a fatter tire up front and ride it like it is.
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