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Stick a fork in it?

Old 12-25-20, 09:14 AM
  #1  
trayraynor
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Stick a fork in it?

WWYD?

Looking for your ideas; what would you do?


This is the Trek 970 with a bad suspension fork. The components are Shimano Deore DX.

Here's the Rockshox RS1; notice it's bent just below the bottom cup.

Here's my old Trek 950 collecting dust; the fork is solid and is a perfect fit for use on the 970. Both frames are 22-inch.


I just added this 1990 Trek 970 Singletrack (Red) to my stable; having picked it up off of OfferUp for a few $; it has a bad suspension fork (Rockshox RS1) which is not only bent, but it leaks fluid due to bad seals. The frame size is 22-inch. I've searched locally for another mountain bike to buy for parts, namely a suspension fork, but finding a decent 1-inch threaded suspension fork has been somewhat elusive.

I've had a 1990 Trek 950 Singletrack (Blue) 22-inch frame hanging in the garage for years collecting dust. The 950 frame and fork are in excellent condition; all the components have been removed.

The Plan: Remove the 1-inch threaded Rockshox RS1 from the Trek 970 and replace it with the solid 1-inch threaded fork from the Trek 950.

Is this a good idea? Any suggestions?
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Old 12-25-20, 09:44 AM
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1” MTB forks do seem to be hard to come by, but not THAT hard. I helped a friend update his Mongoose MTB that had a useless “shock” fork. I bought a used Tange unicrown threaded MTB fork that had the correct Canti bosses for like $30 + shipping. He was excited that the end result was lighter in weight & functioned adequately for the light dirt trail and bike path riding that he did.
If it were me, I would keep looking for a proper replacement fork & leave that (complete) Trek backup frame set alone.
i would only scavenge that fork as a last resort.
When I haven’t been in the market for a particular part is when they suddenly become very available. Some sort of cosmic irony I guess.
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Old 12-25-20, 09:47 AM
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I would keep the blue together. I would also just hold the 970 until a red, black, or white fork crosses your path. IMO don't bother with 1" suspension forking they, if you can find working, are not going to last, dont have much travel, heavy.

I replaced the Rockshock on my 930 with a Kona Project 2, but my 930 is 1 1/8" steer tube.
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Old 12-25-20, 11:04 AM
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Co-ops are your friend. Lots of 1" rigid forks available.
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Old 12-25-20, 01:05 PM
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Keep the blue 950 together and install the drivetrain and cockpit from the red 970 onto the blue 950.
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Old 12-25-20, 09:00 PM
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Originally Posted by notenoughdaylig View Post
Co-ops are your friend. Lots of 1" rigid forks available.
>This<
Our local co-op has barrels of older forks- it might take a bit of digging to find the correct fit, but it would be worth it.
Then- add drop bars, bar-end shifters, perhaps change the stem as needed, and add smoother road/ gravel tires. Bingo.
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Old 12-26-20, 02:50 AM
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It's not particularly difficult to do if the headsets match.
So why not if you want to get out and ride it.
And then you will know.
Put it back the way it was if you don't like it or come across another fork.
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Old 12-26-20, 04:53 AM
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Are you sure it is bent? I have an early mtb fork and it is also milled at an angle like that to provide rake.
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Old 12-26-20, 05:05 AM
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Have you looked at the specs for the Trek 1990 ATBs? It looks like the frame specs that year for the 950 and 970 are the same.

https://www.vintage-trek.com/images/t...rek/90Trek.pdf

The difference looks to be simply in the parts. I vote for building up the 950 and looking around for a fork for the 970.
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Old 12-26-20, 02:52 PM
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Originally Posted by narhay View Post
are you sure it is bent? I have an early mtb fork and it is also milled at an angle like that to provide rake.
this^^^^

The fork legs are straight, and the crown has no offset, hence the crown has to have that angle in order to achieve any rake at all.

The rigid Tange Switchblade forks similarly used this same sort of angled crown.

Last edited by dddd; 12-26-20 at 02:57 PM.
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Old 12-26-20, 02:57 PM
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The RS1 with such a nice, long steer tube would have to be valuable on the market.
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Old 12-27-20, 10:23 AM
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Originally Posted by dddd View Post
this^^^^

The fork legs are straight, and the crown has no offset, hence the crown has to have that angle in order to achieve any rake at all.

The rigid Tange Switchblade forks similarly used this same sort of angled crown.
It sounds like you're suggesting the fork isn't bent; however, I may have failed to mention earlier, that the left seal is shot and leaks fluid. I've searched for replacement parts for an RS1 and can't find seals.
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Old 12-27-20, 10:27 AM
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Originally Posted by trayraynor View Post
It sounds like you're suggesting the fork isn't bent; however, I may have failed to mention earlier, that the left seal is shot and leaks fluid. I've searched for replacement parts for an RS1 and can't find seals.
Right but the 1992 950 has the exact same frame as the 970 of that year I believe.
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Old 12-27-20, 10:46 AM
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I agree, the frame specs are identical; the only difference I can find is the layout of the cabling, the 970 moved the three rear cables to the top tube.


The improvement of the 1990 970 frame over the 1990 950 appears to be the layout of the cabling; the 970 routes three cables on the top tube. Trek notes this improvement in the 1990 catalog.
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Old 12-27-20, 10:47 AM
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I would tend to agree on the potential value; however, with the left seal leaking as it is, and no apparent replacement parts available, it seems my only choice is to discard the RS1.
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Old 12-27-20, 10:50 AM
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Both you and dddd indicate the fork may not be bent; I hadn't thought of this previously, but I recall the Tange fork on my 1992 Ellison Tandem has a similar bend to the crown, so I'm thinking you both are correct, it may not be bent.
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Old 12-27-20, 12:16 PM
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Do a google search for RockShox RS1, there's several sources for seal kits available out there.
The main seals are just orings and could likely be matched up at the hardware store.
I just resealed one on a buddies Nishiki, every oring I needed came from a generic oring kit.
The wiper or dust seals were good enough to reuse, especially since he doesn't really use off road.
Personally I'm not a fan of shock forks, they're heavy, offer little benefit due to the limited travel, and
when they fail in a way they can't be fixed, it can be hard to find a suitable replacement after so many years.
By the look of the bike, at least judging by the pics, the bike doesn't look to have been used very hard over the years and the seals are likely just dry rotted from age and not damaged from use or worn out so a simple oring replacement may be all it needs.


RockShox Seal Kit
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