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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 06-01-07, 12:34 PM   #1
bradberry00
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Drilling holes for weight reduction?

I'm a hot rod guy, bikes are me cheap and enjoyable alternative. In the hot rod/automobile racing world it was and is common to drill holes in frames, axles, etc. to reduce weight. Is this kosher in the world of bikes? Can frames and Forks be drilled? what areas should you avoid drilling to avoid strength issues? I just think it would look cool on my planned fixed vintage project.

thanks,
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Old 06-01-07, 12:39 PM   #2
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Drilling the daylights out of parts was all the rage back in the 1970's and early-1980's.
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Old 06-01-07, 12:49 PM   #3
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Drilling a frame and or fork is a big bad idea. a frame and fork are all load bearing structures, and are designed with minimal extra, all parts are doing their work. putting holes all over the place will severely weaken your ride, and put you in danger!!! Like was mentioned, they did it back in the day, but on things like levers, shifters, sprockets, etc- parts that wouldnt put your life in danger if they failed

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there are better ways of getting that old school hot rod look.
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Old 06-01-07, 12:50 PM   #4
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drillium! i was actually thinking about drilling my lugs a bit for looks but it would take some carfull planning and exicution. i think the tubes would be too thin for that though. also the holes would allow water to get into the frame so i was only thinking the lugs at the seat post and around the headset would be acceptable for that treatment.
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Old 06-01-07, 03:59 PM   #5
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Trials guys still drill their rims to save weight, but frames and forks these days are on the limit as they are, drilling them out would be suicide!
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Old 06-02-07, 03:50 PM   #6
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You can still purchase drilled chainrings (have a sugino) and drilled looking cogs (have a surly). Have seen very cool drilled bmx brake levers- drilled at the mounting clamp. The miche supertype seatpost has a look similar to drilled stuff although its something different. Some chains have holes in the chainplates. There are some brakes that look lightwieght- sram rval (i think) and i think johnny cycles is the maker of the drilled looking frame, the picture of which Im attaching. Seome custom made, if i remeber well, dropouts also.... and other things.
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Old 06-02-07, 04:04 PM   #7
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My personal favorite:
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Old 06-02-07, 05:41 PM   #8
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awesome!
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Old 06-02-07, 07:05 PM   #9
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i've got a pic somewhere of merckx on a gorgeous bike with fully drilled campy everything, i so wonder where that bike's hanging up.
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Old 06-03-07, 09:50 PM   #10
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There have been some awesome track bikes built with drilled frames and forks for aero benefits, but they also brazed tubes in the holes to get the strength back (like the Jonny bike). the end result was a bike that was very fast, looked very cool, but was heavier than the same bike sans holes.

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Old 06-03-07, 11:16 PM   #11
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I'd like to see the physics there- drilling would likely only INCREASE air resistence.

Quote:
Originally Posted by SamHall
There have been some awesome track bikes built with drilled frames and forks for aero benefits, but they also brazed tubes in the holes to get the strenth back (like the Jonny bike). the end result was a bike that was very fast, looked very cool, but was heavier than the same bike sans holes.
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Old 06-04-07, 04:41 PM   #12
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I'd like to see the physics there- drilling would likely only INCREASE air resistence.
The holes I'm talking about were running front to back, not side to side like on the Jonny bike.
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Old 06-07-07, 10:45 PM   #13
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what can happen if you get a little too excited with your drilling

http://web.archive.org/web/200608190...rilledpost.jpg
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Old 06-08-07, 08:33 AM   #14
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how much weight are you going to save anyway? spend the time training a bit more, or work on getting your posture a bit more aero and you'll be better off than if you had a drilled out (weak) part that saved you 8 grams. especially if the chainring folds on a sprint or the seatpost buckles and sends you to the hospital.
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Old 06-08-07, 10:57 AM   #15
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I think it's more of the look, and the idea than the actual benefit
And yeah, drilled and counter-sunk brake levers, chainrings, and shifters look cool. Also seen some lugs with decorative holes... although probably done before assembly.
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Old 06-10-07, 01:05 PM   #16
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Old 06-25-07, 02:53 PM   #17
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Quote:
Originally Posted by kubacola
You can still purchase drilled chainrings (have a sugino) and drilled looking cogs (have a surly). Have seen very cool drilled bmx brake levers- drilled at the mounting clamp. The miche supertype seatpost has a look similar to drilled stuff although its something different. Some chains have holes in the chainplates. There are some brakes that look lightwieght- sram rval (i think) and i think johnny cycles is the maker of the drilled looking frame, the picture of which Im attaching. Seome custom made, if i remeber well, dropouts also.... and other things.
Are those Sugino cranks old or can you still get them like that? I really love the old slender cranks.
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Old 06-25-07, 05:55 PM   #18
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Tear along the dotted line.

The biggest frame "drillout" is already in place: the hollow center space in the middle of the frame tubes.
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Old 06-25-07, 08:30 PM   #19
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Quote:
Originally Posted by mentat6059
what can happen if you get a little too excited with your drilling

http://web.archive.org/web/200608190...rilledpost.jpg
what's up with the campy banner behind the last photo?
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Old 06-26-07, 04:51 PM   #20
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In the mid-70s a bit lighter but rode like a very wet sponge!
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Old 07-06-07, 09:01 AM   #21
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I guess you could do a little decorative countersinking on lugs if it's not very deep, then paint with a contrasting color. i wouldn't drill components unless I had a milling machine and rotary table to get them all in the right spot. Nothing worse looking than "home-made" drilling
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Old 07-06-07, 09:22 AM   #22
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They stopped drilling components because they found in the wind tunnel that there was greater drag created by all the drilled holes than what was gained through weight loss.
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Old 07-06-07, 05:55 PM   #23
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Quote:
Originally Posted by dookie
what's up with the campy banner behind the last photo?
That's Andy White from Fyxomatosis.com. He makes jerseys with a Campy-esque logo using the words "trackcvnt" instead.
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Old 07-06-07, 06:00 PM   #24
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The wind tunnel test canned the Pantagraphic cuts and drilled holes. I think it looks pretty cool --- and retro!! I have some parts that have been "holed"
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Old 07-06-07, 06:51 PM   #25
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It's only valid if the heavy dust caps are removed too.
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