Can this be done safely? Looking at some carbon extensions that don't have exit holes for cables other than at the back.
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Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
My first reaction is no donât even think about it.
My second reaction is, but thatâs not an advise but purely a thought what would I do MYSELF: If the cross section is identical over the length of the extension, and if would have to make a hole, I would drill it near the end because there the bending moment is the smallest. Of course you would have to lead your cables all along the outside of the extensions.
But as I wrote: I do not know how carbon reacts after drilling: you are going to cut carbon fibers which also weaken parts adjacent the holes.
My second reaction is, but thatâs not an advise but purely a thought what would I do MYSELF: If the cross section is identical over the length of the extension, and if would have to make a hole, I would drill it near the end because there the bending moment is the smallest. Of course you would have to lead your cables all along the outside of the extensions.
But as I wrote: I do not know how carbon reacts after drilling: you are going to cut carbon fibers which also weaken parts adjacent the holes.
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
Get alloy ski bends
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Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
The answer to "can I?" and "Should I?" might not be the same. If it is a location that is not under load (like the tail that sticks out the back of the clamp) it would probably be OK, but if it is somewhere under load, drilling the hole is going to weaken it. There is also the problem of the carbon delaminating where the bit comes out.
https://www.elevatedmaterials.com/drilling-carbon-fiber/
https://www.elevatedmaterials.com/drilling-carbon-fiber/
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
I drilled oval-shaped exit holes in my carbon extensions for Di2 cables. I have not died yet. I would do it again... Extensions are relatively thick-walled and strong because they manufacturers do not know where they will be clamped. I positioned my exit holes between the clamp points, so risk of failure due to excessive stress in that area is relatively low.
Re: Drilling holes in carbon extensions???? [ericMPro]
[ In reply to ]
I'm trying to get my hands higher. I was thinking thinking the high rise extensions like USE.
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
Thatâs exactly what I use
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Aerodynamic Retul Bike Fitting
âYou are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.â
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Re: Drilling holes in carbon extensions???? [ericMPro]
[ In reply to ]
20° pad wedge and 40° high rise extensions?
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
50 because I have an undermount system
Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting
âYou are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.â
Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting
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Re: Drilling holes in carbon extensions???? [ericMPro]
[ In reply to ]
ericMPro wrote:
50 because I have an undermount systemDo u feel like the bike handles sketchy with your hands that High?
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
No
Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting
âYou are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.â
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Re: Drilling holes in carbon extensions???? [exxxviii]
[ In reply to ]
exxxviii wrote:
I drilled oval-shaped exit holes in my carbon extensions for Di2 cables. I have not died yet. I would do it again... Extensions are relatively thick-walled and strong because they manufacturers do not know where they will be clamped. I positioned my exit holes between the clamp points, so risk of failure due to excessive stress in that area is relatively low.The hole is in an area of almost zero stress, so the only real issue would be crack propagation from poor drilling. The same hole just forward of the clamp would likely be a disaster (highest stress point).
I'd say you are fairly safe if the exit holes are significantly behind the basebar clamp (no moment arm and far enough back from the clamping stresses that could cause cracking), and up next to the shifter (also a low stress area). A lot can go wrong drilling composites (esp w/o subsequent reinforcement), that's why most hole are moulded in.
Check out the video at 2:15
https://www.cyclingweekly.com/videos/watch/watch-ag2r-development-rider-crashes-high-speed-as-time-trial-bars-snap-after-going-over-bump
ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)
Re: Drilling holes in carbon extensions???? [Fishbum]
[ In reply to ]
Fishbum wrote:
Can this be done safely? Looking at some carbon extensions that don't have exit holes for cables other than at the back.Hey Fish,
Be careful...I cant speak to every extension but we did go through multiple iterations in the SHIV development to implement the windows you see on the new carbon extensions. The hole and resulting stress concentration is 1 thing, but the broken fibers from the drill are another. Molded holes and drilled holes behave much differently. An extension that is not reinforced at the hole can have problems.
Re: Drilling holes in carbon extensions???? [Titanflexr]
[ In reply to ]
This clip has nothing to do with drilled extensions.
It is documented that this crash happened because the contracted mechanic installed too short of bolts through the aerobar risers.
Alex Arman
Strava
It is documented that this crash happened because the contracted mechanic installed too short of bolts through the aerobar risers.
Alex Arman
Strava
Fishbum wrote:
Can this be done safely? Looking at some carbon extensions that don't have exit holes for cables other than at the back.I'd be more heistant if it were a mounting point/clamp area.