Tech Shimano crank bolt rounded off - how to remove?

Lupo

Speeding Up
Jun 8, 2012
31
24
28
Tokyo
#1
Hello everyone, I am supposed to participate to the Saitama TT race this Sunday, and just noticed that my bike's BB is creaking. Good opportunity to extract, clean, and realign the crankset.

And here is the damage: when I tried to remove the first bolt on the left side of the crank, I accidentally applied too much power and rounded off the bolt's head. I have spent some time trying to unscrew the bolt with no success (tried hammering a slightly bigger allen key, tried using a flat screw driver, etc.). Don't know what to do.

Did you ever experienced a similar problem? Can you recommend a bolt shop or bike mechanic that would be able to help me? I went to a small bike shop near my house (Shirokane), but very unhelpful ...

Thanks for your suggestions. Cheers, Stefano.
 
Last edited:

Lupo

Speeding Up
Jun 8, 2012
31
24
28
Tokyo
#4
Thanks GrantT, will check it out.

Hi James, did you do it yourself? Where should I go to have it drilled? I guess I need some equipment ...
 

FarEast

Maximum Pace
May 25, 2009
5,528
538
193
Yokohama
#5
I did it myself but I also have confidence to take a drill to a DuraAce set of cranks or the saw to a top of the line frame. EFFECT is a good place to go, he's not only our team mechanic but also that of Cannondale.
 

leicaman

Maximum Pace
Sep 20, 2012
2,512
2,191
133
Asakadai, Saitama
#6
Y
I did it myself but I also have confidence to take a drill to a DuraAce set of cranks or the saw to a top of the line frame. EFFECT is a good place to go, he's not only our team mechanic but also that of Cannondale.
Confident because you know if you mess it up, you don't have to pay for a new one ;)
 
Likes: mau

Lupo

Speeding Up
Jun 8, 2012
31
24
28
Tokyo
#10
Passed by Nalsima in Gaien yesterday in the afternoon, and - magic of magics - they managed to remove the bolt in about 20 minutes. These guys are great. Now my bike has stopped making all those strange sounds ... :)