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What is this thing?

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What is this thing?

Old 10-31-20, 03:56 PM
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What is this thing?


What is this little knob poking from the head tube?
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Old 10-31-20, 03:58 PM
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It's a pump peg
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Old 10-31-20, 03:58 PM
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Pump peg.
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Old 10-31-20, 04:12 PM
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Here's one with a pump on it. I think pump pegs became more widespread when bikes started getting a second set of water bottle mounts on the seat tube.


1992 Performance Parabola
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Old 10-31-20, 04:21 PM
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Why not show the full bike
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Old 10-31-20, 07:12 PM
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Thanks dudes! Now I know! And knowing is half the battle.
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Old 10-31-20, 07:14 PM
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Gorgeous Rossin!
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Old 10-31-20, 08:38 PM
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Lovely!
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Old 10-31-20, 11:48 PM
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Thanks guys!
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Old 11-01-20, 05:24 AM
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Turbo boost button
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Old 11-01-20, 12:41 PM
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Originally Posted by P!N20
Turbo boost button
I thought it was either that, or where you fill the frame with helium.
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Old 11-01-20, 01:01 PM
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@Ironskillet - To be used like this:
P1040401 on Flickr
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Old 11-01-20, 01:08 PM
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Originally Posted by Ironskillet
Now I know! And knowing is half the battle.
The great American hero!
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Old 11-01-20, 01:34 PM
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Vestigial frame tube or supernumerary top tube.
Most bicycle scientists feel the answer is inconclusive.
Either way, go ahead and use it to support a frame pump.
That's how most of us use it.
Whatever you do, don't finger it obsessively while riding.
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Old 11-01-20, 01:54 PM
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Originally Posted by Ironskillet
I thought it was either that, or where you fill the frame with helium.
Nope, here's where you do that. 😄

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Old 11-01-20, 10:08 PM
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Originally Posted by Germany_chris
It's a pump peg
Aww man, you answered too quickly... I would have said something outrageous like "Zirx grease fitting for the head tube" ... (hey, what a great idea....)
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Old 11-01-20, 10:17 PM
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If the pump can't be braced against something, then they are near useless. IMO.
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Old 11-02-20, 06:42 AM
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Originally Posted by GamblerGORD53
If the pump can't be braced against something, then they are near useless. IMO.
Yes. Use to carry the pictured one on my Montello. Hit a hard bump on the MUP and it was knocked off! Almost caught in my spokes. Certainly upset my riding rhythm! Another time I hit it when using my DT's. CO2 is now the source of filling repaired innertubes or replacement sew ups.
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