Front disk bend

**Pedrostt500** · 31st August 2009, 08:17

Originally Posted by Crisis management

You can straighten discs with careful whacking with a hammer, I've done it successfully on road bikes a few times and a couple of unsuccesfull ones...must stop crashing!

Locate the high point on the disk and mark it with a felt pen or something, take the disc off the hub and support it on two metal bars about 50mm apart. You need metal so they don't absorb any of the hammer force, wood won't do, I've used the top face of a large vise set 50mm open for this.
Whack the high point with a hammer.

Unless you have a surface table (highly unlikely) you will need to remount the disc and check for runout and then keep doing this until you either lose the plot or straighten the disc.

Would recomend putting some aluminium soft jaws on your vice, thought two peices of ali bar on the bench would be better, also use a soft face hammer. so you dont mark the disc, though a new disc would be a better option.

**L Rider** · 31st August 2009, 09:18

Mine is slightly bent - has been for a while. Thanks for the tips will get hubby to have a go at straightening it

**IIIRII** · 31st August 2009, 10:26

Cheese its a piece of piss to straighten,
Do pretty much what the others have said, but if it were me I would use a press, you wont have access to one so the next best thing is a drill press (and I do not mean a $20 toy)
Mark the high point , put it on two parallels and lean on the marked point with a piece of ally under the drill chuck (wind the jaws back into the chuck so you use the body of the drill chuck and not the jaws)
Use a window as a surface plate (glass is a very good home handimans surface table) and or check with a steel ruler.
Might take a couple of goes to get the correct pressure to overbend etc:
Done.