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unknown spring?

Old 08-09-23, 08:43 AM
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unknown spring?

I have several bikes in the garage, two 9-speed road bikes and a drop bar converted Trek 7.5fx. All have STI-type shifters, canti brakes, front derailleurs. I just walked by the bikes and noticed this spring on the floor under one of them. There are a number of springs on bikes..but I'm not placing this one. Any idea?



I need to take them all out for a spin to see if anything isn't working, but after building a half dozen bikes, I'm drawing a blank on where it would come from.
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Old 08-09-23, 12:10 PM
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Practical joke.
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Old 08-09-23, 12:13 PM
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Francis could be correct in that it has nothing to do with bikes.
However, I'd probably squeeze some brake levers.
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Old 08-09-23, 12:49 PM
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Originally Posted by Bill Kapaun
I'd probably squeeze some brake levers.
That, and see if a derailleur tries to go immediately to the smallest gear.

Wherever it came from, it seems extraordinarily rare for a spring to pop out of place while everything is sitting static in the garage. Stuff tends to break while in use.
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Old 08-09-23, 12:54 PM
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Old 08-09-23, 01:06 PM
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Originally Posted by _ForceD_

If the mystery spring lived on a derailleur limit screw, there should be a derailleur limit screw on the floor near it.
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Old 08-09-23, 02:15 PM
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Originally Posted by fishboat
I have several bikes in the garage, two 9-speed road bikes and a drop bar converted Trek 7.5fx. All have STI-type shifters, canti brakes, front derailleurs. I just walked by the bikes and noticed this spring on the floor under one of them. There are a number of springs on bikes..but I'm not placing this one. Any idea?

I need to take them all out for a spin to see if anything isn't working, but after building a half dozen bikes, I'm drawing a blank on where it would come from.
It does seem most likely that it is a spring meant to keep tension on a bolt so the bolt doesn't unscrew. But in order for there to be a spring on the floor, there would need to be a bolt too. Careful visual inspection seems to be your best option.
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Old 08-09-23, 03:10 PM
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What is the spring's ID and what bolts your bikes have that would fit? Will a der limit screw fit inside the spring snuggly? Are there any cable adjusters that use this type of spring on the bikes? The spring looks to be a tad large for typical limit screws. I question whether it's for a bike at all. Andy
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Old 08-09-23, 03:43 PM
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Almost certainly not a limit screw. First of all, by the time the limit screw backs off enough, there would be noticeable shifting issues.

Refreshingly (because few ever do) the OP was smart enough to scale it by including a Quarter for reference. That makes it 8-10mm in diameter, so we need to limit our possibilities accordingly.

While, I said "practical joke" facetiously, I'd be looking around the garage for other items that might use such a spring, keeping in mind that there's no reason to assume it would end up close to where it fell.
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Old 08-09-23, 07:33 PM
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Originally Posted by Broctoon
If the mystery spring lived on a derailleur limit screw, there should be a derailleur limit screw on the floor near it.
Unless the spring launched the screw across the room and then just fell next to the bike.

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Old 08-10-23, 05:38 AM
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Thanks to all that tried to figure this out. When I posted initially I thought either someone would immediately say "that's a spring that fits right here(followed by a pic)" or folks would end up where I was, that being, "never saw a spring like that on any typical bike part".

I think I figured it out. I rode the bikes and they are fine. While checking out the bikes I noticed a bell on my GF's 7.5fx that had no..bell..on it, but had a center stem where a bell was once mounted. No clue where the bell top went(or how to reattach it if I did find it). I started looking at a similar (same mfg) bell I had and asked myself..how would a bell be mounted to the center post? If it were bolted(hard-attached) on it wouldn't ring much. If it were mounted on top of a suspending spring..it would r-i-n-g when struck. . So..that's my guess. The bell top fell off somewhere and the spring fell off the post as I was putting the bikes away.

After looking at another bell..still no idea how it actually attached to the post below. It looks like some sort of rivet on the top, though not sure how. The replacement bell top seems very securely attached (and suspended underneath by a spring).


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Old 08-10-23, 07:43 AM
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Thanks for the follow up. I would have never thought of a bell. Andy
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Old 08-10-23, 08:11 AM
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The bell ( part that resonates to make the sound) is hard mounted at the center and not impact the sound. Anything touching the surface past the mounting point will, including a spring that might be touching past the mount interface.

My problem is laying down unique washers and then forgetting after several days, where they go and on what part!
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Old 08-10-23, 09:05 AM
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Originally Posted by SJX426
My problem is laying down unique washers and then forgetting after several days, where they go and on what part!
When I do any kind of disassembly work, bikes or otherwise, if I'm not fluent in the mechanism, I take a bazillion pics with my phone from every angle and at multiple stages. I've had a bad habit in the past of focusing on getting something apart while not necessarily digesting what went where.

The bell top does seem to be suspended above anything hard as it depresses maybe a few mm when I push on it. Something is attaching the stem to the bel-top inside as the spring is compressed. No doubt it's simple..for someone designing widgets.
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Old 08-11-23, 01:15 AM
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it is a big spring for a bike, I would say it is from the brakes, there are very few springs on a bike
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