unknown spring?
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.
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.
08-09-23, 12:10 PM
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Practical joke.
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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.
However, I'd probably squeeze some brake levers.
08-09-23, 12:49 PM
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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.
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.
08-09-23, 02:15 PM
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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.
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.
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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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.
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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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
08-09-23, 07:33 PM
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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).
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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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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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!
My problem is laying down unique washers and then forgetting after several days, where they go and on what part!
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Bikes don't stand alone. They are two tired.
08-10-23, 09:05 AM
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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.
