Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Thread Tools Search this Thread
Old 09-11-10, 03:07 PM   #1
Thread Starter
Join Date: Sep 2010
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Aluminum frame dent


I've got a Fuji track pro with a 2" dent in the downtube a little above the BB welds. The bike rides fine without any noise but it looks like it's warping slightly (see pic) and I wanted to get a second opinion on whether it's safe to ride (or whether I should bring it into a mechanic for a real look )

Thanks for any help.
Attached Images
File Type: jpg SDC10581 (Medium)..JPG (97.4 KB, 31 views)

Last edited by spindle23; 09-11-10 at 03:12 PM.
spindle23 is offline   Reply With Quote
Old 09-11-10, 03:16 PM   #2
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 35,060
Mentioned: 100 Post(s)
Tagged: 1 Thread(s)
Quoted: 3447 Post(s)
Odds are it'll crack eventually, but that could be a week, month, year or decade. Of the various places a frame could crack this is about the safest, so discounting the risk of having to walk or hitchhike home, it's probably OK to ride if it still tracks well.

BTW- keep an eye on it for any hint of crack formation, and when you see the beginnings of a crack, bench it.
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is online now   Reply With Quote
Old 09-11-10, 05:45 PM   #3
Senior Member
clasher's Avatar
Join Date: May 2009
Location: Kitchener, ON
Posts: 2,032
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
You could wrap it in carbon fibre if you're so inclined. No worries then when the aluminum goes. It won't look pretty though, the CF I mean. I did it with a black bike and it's like a cast on the chainstay. I'm a big fella it's seen constant service since February of this year. I used a kit from ebay that was 25$, so it would be cheap peace of mind if you're so inclined, but I agree 100% with the assessment posted above as well, FWIW.
clasher is offline   Reply With Quote
Old 09-11-10, 06:38 PM   #4
bike whisperer
Kimmo's Avatar
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 7,158
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
You should prolly get this thread moved to Framebuilding.

I can't help wondering whether someone could repair that properly... stick it on an alignment jig, heat-treat it again, maybe even suck that dent out.
Kimmo is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 03:05 PM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.