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Author Topic: Crash bar  (Read 1051 times)

Offline BooG

  • Lives in Foothills of Mt. Olympus
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Crash bar
« on: June 18, 2016, 03:18:23 PM »
I want to straighten a crash bar on the R65. It is chromed, and only has a slight bend out of true. Can I heat to up with my blow torch and bend it back? Will it ruin the chrome?
BMW R65 1980.
Vespa Sprint Veloce 1971
BMW K75S 1987



Offline Tony Smith

  • Mt. Olympus Resident
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  • Posts: 2331
  • Graduate, Wallace and Gromit School of Engineering
Re: Crash bar
« Reply #1 on: June 18, 2016, 06:13:52 PM »
Quote
I want to straighten a crash bar on the R65. It is chromed, and only has a slight bend out of true. Can I heat to up with my blow torch and bend it back? Will it ruin the chrome?

At the very least you will "blue' the chrome, but in all liklihood you will ruin it.

Flat black is the correct colour for crash bars anyway :-)
1978 R100RS| 1981 R100RS (JPS) | 1984 R65 | 1992 KLE500 | 2002 R1150GSA |

Offline Barry

  • Mt. Olympus Resident
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Re: Crash bar
« Reply #2 on: June 19, 2016, 03:12:18 AM »
I've done it with handle bars.

I tried to bend them cold and the steel just sprang back. Steel starts to weaken a long way before red heat and I took advantage of this to bend handle bars at bluing temperatures of  300-400 Deg C.  It worked and you could feel the metal bend because the spring had gone out of it. Most of the bluing polished out but I wouldn't say the finish was perfect. It didn't matter in my case as that part of the handle bar wasn't visible.  

Might be worth a try using a minimum of heat to see if they will move.
Barry Cheshire, England 79 R45