Head tube crack - Repairable?
#1
Hip to the Game.
Thread Starter
Join Date: Jul 2007
Location: Cracklanta, GA
Posts: 408
Bikes: Kona Lava Dome, Kapu 853
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Head tube crack - Repairable?
Upon pressing in a headset, the head tube of one of my frames developed a crack. It's not terribly large (approx. 1/4" long), starting at the bottom of the tube, on the front side (basically looking straight forward).
The frame is aluminum, so I'm wondering if this would be repairable by a competent welder, who could potentially fill in the crack, and grind/sand the tube smooth/round.
No chance at a warranty or replacement.
Thoughts?
Kotter
The frame is aluminum, so I'm wondering if this would be repairable by a competent welder, who could potentially fill in the crack, and grind/sand the tube smooth/round.
No chance at a warranty or replacement.
Thoughts?
Kotter
#2
Senior Member
Join Date: Dec 2005
Location: Atlanta, GA
Posts: 1,223
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
While it's possible to weld the crack, it's likely the head tube will crack again, probably next to where it was welded. It would be a temporary and somewhat risky fix at best.
#3
Hip to the Game.
Thread Starter
Join Date: Jul 2007
Location: Cracklanta, GA
Posts: 408
Bikes: Kona Lava Dome, Kapu 853
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
That's what I was thinking. I'll be keeping a close eye on it. It should be rideable until I find a suitable replacement.
#4
use your best eye
Join Date: Mar 2006
Location: Olympia, Washington
Posts: 3,050
Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Not reliably repairable. My condolences.
Your frame has 'ceased to be'. It is an 'ex-frame'.
Your frame has 'ceased to be'. It is an 'ex-frame'.
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
#5
Bikaholic
Join Date: Dec 2006
Location: Western, Michigan
Posts: 1,461
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
This crack could result in a sudden failure. Having the fork come out at an inopportune time can be very bad. Would you be so kind as to name my as a beneficiary on your life insurance? Really though, I would not ride it at all but I like to err on the side of caution.
#6
Senior Member
Join Date: Oct 2007
Location: SoCal
Posts: 1,169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Upon pressing in a headset, the head tube of one of my frames developed a crack. It's not terribly large (approx. 1/4" long), starting at the bottom of the tube, on the front side (basically looking straight forward).
The frame is aluminum, so I'm wondering if this would be repairable by a competent welder, who could potentially fill in the crack, and grind/sand the tube smooth/round.
No chance at a warranty or replacement.
Thoughts?
Kotter
The frame is aluminum, so I'm wondering if this would be repairable by a competent welder, who could potentially fill in the crack, and grind/sand the tube smooth/round.
No chance at a warranty or replacement.
Thoughts?
Kotter
Are you sure it is the actual tube? Just asking, if youve pulled the race to check or can actually see the depth sorry to hear it. I always hope for the superficial first.
#7
Gone, but not forgotten
Join Date: Jul 2002
Location: Newtonville, Massachusetts
Posts: 2,301
Bikes: See: https://sheldonbrown.org/bicycles
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Likes: 0
Liked 6 Times
in
5 Posts
The poster who wrote "This crack could result in a sudden failure." is a well-meaning alarmist. The location of the crack means that it is mainly stressed in static weight bearing. It carries no share of braking load.
If the problem does get worse (the crack grows) it will give you plenty of warning. It will feel as if the headset is misadjusted (too loose) LOOOOOOONG before there's any chance of "sudden failure."
Sheldon "Seen This Before" Brown
#8
use your best eye
Join Date: Mar 2006
Location: Olympia, Washington
Posts: 3,050
Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Sheldon, thank you for your knowledge and real experience, it is very much appreciated.
You rock, dude!
You rock, dude!
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
#9
Bikaholic
Join Date: Dec 2006
Location: Western, Michigan
Posts: 1,461
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
If you're going to keep riding it, it would be a good idea to drill a small (3/16"?) hole just where the crack ends. This will stop the sharp end of the crack from acting as a stress riser. If you don't do that, the crack is liable to grow.
The poster who wrote "This crack could result in a sudden failure." is a well-meaning alarmist. The location of the crack means that it is mainly stressed in static weight bearing. It carries no share of braking load.
If the problem does get worse (the crack grows) it will give you plenty of warning. It will feel as if the headset is misadjusted (too loose) LOOOOOOONG before there's any chance of "sudden failure."
Sheldon "Seen This Before" Brown
The poster who wrote "This crack could result in a sudden failure." is a well-meaning alarmist. The location of the crack means that it is mainly stressed in static weight bearing. It carries no share of braking load.
If the problem does get worse (the crack grows) it will give you plenty of warning. It will feel as if the headset is misadjusted (too loose) LOOOOOOONG before there's any chance of "sudden failure."
Sheldon "Seen This Before" Brown
I stand corrected. "well-meaning alarmist"? Guilty as charged. I always prefer to err on the side of caution on things like this. Good point on the drilled hole to mitigate a stress riser.
#11
Hip to the Game.
Thread Starter
Join Date: Jul 2007
Location: Cracklanta, GA
Posts: 408
Bikes: Kona Lava Dome, Kapu 853
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Drilling the hole is a good idea. I can *just* see the HS race through the crack in the right light, so I know it's not just paint. My LBS concurred, and has also pretty much givent eh same words of wisdom here, save the "well-meaning-alarmist."
I know it's not a stress-bearing area, so it wil be okay for a while.
I actually thought about a hose clamp, but there's not enough space to fit it in there.
Thanks for all the advice everyone.
Kotter
I know it's not a stress-bearing area, so it wil be okay for a while.
I actually thought about a hose clamp, but there's not enough space to fit it in there.
Thanks for all the advice everyone.
Kotter
#12
a77impala
Is the tube long enough so you could cut it off at the point of the crack? A quarter inch shouldn't change the dynamics of the frame a noticable amount.
#14
Perineal Pressurized
Join Date: Oct 2003
Location: In Ebritated
Posts: 6,555
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
How about popping the bottom cup back out and then reinstalling it with the addition of some epoxy. Might serve as an additonal structural element to help hold it all together.
__________________
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
#17
Listen to me
Join Date: Nov 2004
Location: Lexus Texas
Posts: 2,788
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#18
Member
Join Date: Oct 2007
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
does the word"measure" mean anything to you?,the pressed in cups are a "press fit".the cups cannot be more than.2mm bigger if they are you risk cracking the head tube!!!! this is a job for a professional bike machinic,not a home machinic.i have seen more bicycles destroyed this way. headset installation is the most dangerous to the bike if you don't know what your doing.
#19
Hip to the Game.
Thread Starter
Join Date: Jul 2007
Location: Cracklanta, GA
Posts: 408
Bikes: Kona Lava Dome, Kapu 853
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Again, but in English, please.
The frame was at the shop when it happened. Thanks for the input though, cockbite.
The frame was at the shop when it happened. Thanks for the input though, cockbite.
#20
Senior Member
Join Date: Sep 2007
Location: Gaseous Cloud around Uranus
Posts: 3,741
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
Likes: 0
Liked 11 Times
in
7 Posts
As Sheldon said,drill a small hole at the end on the crack,that will stop the crack from getting worse.If there's room for it,you could make a small steel or aluminum ring and shink fit it on the head tube.If your lucky,you can make the ring so it covers the crack and the hole both.
#21
Senior Member
Join Date: Jul 2007
Location: Evansville IN
Posts: 52
Bikes: Cannondale CAAD5, Gary Fisher Montare
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Everybody seems to overstate the importance of heat treating aluminum before it's welded. I unfortunately have weld all day and trust me, on thin walled aluminum there is no need to preheat. Getting the paint off and the part clean woud be far more important. If your wanting a cosmeticly pleasing repain, don't weld it unless you're planning on repainting. You'll wind up boiling all the paint off at least 1.5" around the welded area.
Have you considered the possiblity of not being able to get the diameter of the head tube back to the original size? Sounds like you've managed to stretch it.
Good luck
Have you considered the possiblity of not being able to get the diameter of the head tube back to the original size? Sounds like you've managed to stretch it.
Good luck