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Drilling my seatpost(13 posts)

Drilling my seatpostWoof the dog
Nov 17, 2001 2:13 AM
I am gonna drill a ritchey comp(?) seatpost on my beater bike. Does anyone know of any sites that show examples? Any fun patterns that make funny noises in the wind? Whats the largest diameter I can take out? I weigh 130 pounds so I can get away with a drilled seatpost. Oh man this will be fun! Any ideas welcome.


Woof the drilldog
p.s. What are the other "relatively safe" drillings I can do?
re: Drilling my seatpostAkirasho
Nov 17, 2001 6:09 AM
I've seen drilled components and even a few frames... though I can't reference any sites at the moment... however, despite your lightness of weight, if I were you, I'd whack the ole pud in a cup and store it in the freezer before I'd test ride your new project... for the sake of your future prodigy... :D

We abide.

Remain In Light.

P.S. With respect to "relatively safe" drillings, I was reminded earlier this week on this forum that while Murphy's Law states that "Anything that can go wrong... will..." McGillicutty's Law states that "Murphy was an optimist". Have you developed an abnormal obsession with your tool??!!??
re: Drilling my seatpostCliff Oates
Nov 17, 2001 11:41 AM
I could consider it to be evolution in action.
u r nuts. nmbill
Nov 17, 2001 8:21 AM
your beater will be lighter, flasher and less aero.......dupe
Nov 17, 2001 8:48 AM
but i doubt aero is on your mind.

again i have no site for reference but a myth or lore from the bike mechanic that was my surrogate cycling father assured me (guessed?) that on critical components. the drilling diameter should be no more that 1/8 of the total width of that piece of steel. and then to stagger them he would go 1/3 the distance up and accross. he was adament that it shouldnt be done to alloy pieces.

of course this said bike mechanic made bob roll look pre-pubescant in terms of facial hair, seemed to use campy crystal grease as a moisturiser and hair gel, and had a bike shop that was louder than a blacksmith's.

somehow back then drilling was so common that it seemed like today's carbon bars or titanium seatpots's. but i dont think it was a well thought out science (from my perspective anyway). though my bike did feature drilled brake calipers, brake levers, chainrings and even skewer levers.

ive seen drilled posts but not in looong while. the thought of a failure makes me wince badly every time i think of the possible catastrophies. drilled frames? i dont know about that one but i do wonder about the holes made for bottle cage mounts, cable routings and such. either the points where its "holey" aren't subject to as much strength or they may be reinforced. i wouldnt have the balls to try it with todays beer can tubing.

id like to know how it go's if you do end up drilling it but i would wait till a few bike "scholars" offer their two cents. i assume you have some good machining equipment at home. and to test - who knows? maybe you could stick it in a vise and wind it up longitudonaly if you could measure the torque. perhaps a post on a muscle car forum would provide a few more responses as drilling brake calipers and such is very common. it does have cool factor in it if you can get away with it coz' you weigh slightly more that a wet bird. (sorry just jealous).

im sure there will be a lot of naysayers on this one though.

ciao, ben
funny noises in the wind . . .jacques
Nov 17, 2001 11:02 AM
. . . like all other noises, take energy to produce. Your energy. I have to admit, the idea of a "singing bike" intrigues me. You could plot a speed vs. pitch graph, create chords, play your seatpost like a flute, man o man the possibilities are endless.

BTW, I'm old enough to have been touched, lightly, by the 70's drill-out craze. Little did we realize that for every one gram of mass saved, we added two grams of force to the air resistance.

As for other "safe" components to drill out, try the water bottle.
Drilling my legs...holeman
Nov 17, 2001 11:24 AM
I am gonna drill my legs to save weight and to be more aero. Does anyone know of any sites that show examples? Any fun patterns that make funny noises in the wind? What's the largest diameter I can take out? I weigh 200 pounds so I could use some holes to lighten the weight. Oh man this will be fun! No further ideas please!

Howling the holeman
p.s. Please do not suggest any other body drillings.
re: Drilling my seatpostPJ
Nov 17, 2001 9:47 PM

no offense, but you are a loser! why are you even waisting your time... Go enjoy the view, rider, friends, and forget about the noise under your ASS!!!!!!!!!!!!!!!!!!1
ok, here is an explanation, friend.....Woof the dog
Nov 18, 2001 1:23 AM
mmmmm....dude man, as I said its a beater road bike that I will just ride around town, so i need to add some coolness/unusual appearance factor. Noise is optional but its certainly not what I really care about, I just heard that a drilled seatpost may make a weird noise. Please understand that I already have a great undrilled road machine that gave me plenty of pleasure last spring, summer and this fall. Now, however, I am forced to ride dumb rollers in front of the TV while its raining and (soon) snowing outside. I don't think I deserve being called a loser just because you assume I have nothing else to do other than drill my seatpost. I already do pretty much everything that you said (friends, views or a lack of theirof, etc etc etc). Bike is just a pile of metal but if I change it into something more than regular, it gives me a greater sense of satisfaction. After all, biking is a very meaningful part of my life. But maybe you are right...maybe we all are losers because all of us lust for that new carbon fiber wheel or some other exotic part ;-) Think about this one: just the fact that you are lurking on this forum makes you a loser in a way. I mean I could just as well enjoy the views on a Huffy and never bother writing all these dumb messages. To make it short, be careful about your generalizations.


Woof, the grade A honey producing Bee.

P.S. Nice post below there, Breck.
Band On the Runbreck
Nov 17, 2001 10:00 PM
First i drilled the seat post,
to see if it would bring ...
that pretty whippoorwill tune,
Hank Williams used to sing.

Then i drilled the seat tube,
to start a little choir ...
just an old be-bop tube,
Elvis Presley would admire.

Then i drilled the seat stays,
to add to the band ...
a good old fashioned fiddle,
Bob Wills would understand.

Top tube, down tube, chain stays,
All got their sounds to add ...
When they played "Hot Rod Lincoln",
Commander Cody never sounded as bad :)

cheers woof,
yeah, I drilled it already, BTW.Woof the dog
Nov 18, 2001 1:29 AM
Did it tonight, but forgot to add it to the reply to PJ. I do not like the idea of a jaggered metal pipe up my you know what, so I did it on a conservative side, drilling 16 4mm holes in uncritical places. Drill works pretty well, hehe. Nothing too fancy, just 4 holes front, right, left and rear. Hopefully I will snap the pics of it asap and put 'em up for you guys to see. Aight?


Woof the doggie.
re: Drilling my seatpostBlair
Nov 18, 2001 6:54 PM
For the record, I believe this is a poor idea.
It would certainly be bad on a mtn. bike where I've bent posts.
The real problem with drilling posts is that a drilled post is weaker than a regular post of the same weight. This is due to stress risers. A drill hole is a stress riser which raises the stress by a factor of 3.
The places not to drill would be near the seattube clamp. This is where the greatest stress is.
The other thought to keep in mind is in the simple situation of sitting on the seat the seat tube angle makes the front of the post be in tension, and the back of the post be in compression. Since my broken posts have failed in the back, I would avoid drilling there.
thats exactly what I did tooWoof the dog
Nov 20, 2001 4:17 PM
I didn't drill it anywhere below the clamp. As a matter of fact, I went 1.5 cm above the clamp. I didn't drill out much in the back at all. I gotta make a pic of it and you'll all see, hehe. Thanx for the concern.