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Twisted frame

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EDBANGER
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Joined: 05 May 2005
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PostPosted: 14:13 - 14 Sep 2005    Post subject: Twisted frame Reply with quote
A friend of mine recently crashed his bike and twisted the frame, yokes and front wheel. He's just gone and had it straightened but he's concerned that the bike might not be 100%. Are they usually fine after straightening or will it be considerably weaker??
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instigator
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Joined: 19 Oct 2004
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PostPosted: 14:27 - 14 Sep 2005    Post subject: Reply with quote
I'm quite sure it'll be weaker, but by how much, it all depends on the bike and the severity of the crash surely.

What kind of bike was it?
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Suzuki
Roger



Joined: 03 May 2005
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PostPosted: 14:40 - 14 Sep 2005    Post subject: Reply with quote
The bike will be fine for normal use. However in a crash it will twist again in the same place, possibly worse than the first time.

As for riding it though - tell him not to worry about it.
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EDBANGER
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Joined: 05 May 2005
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PostPosted: 14:58 - 14 Sep 2005    Post subject: Reply with quote
Thats what I thought!!! But then I just wanna have a go Twisted Evil

It was a GSX750R, apparantly the guy reckons the frame was bent by an inch??
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colin1
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Joined: 17 Feb 2005
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PostPosted: 15:00 - 14 Sep 2005    Post subject: Reply with quote
i agree with instigator that it will be weaker
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sickpup
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Joined: 21 Apr 2004
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PostPosted: 18:01 - 14 Sep 2005    Post subject: Reply with quote
EDBANGER wrote:

It was a GSX750R


GSXR or GSXF? 2 very different bikes wirth different frame materials.
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EDBANGER
World Chat Champion



Joined: 05 May 2005
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PostPosted: 08:15 - 15 Sep 2005    Post subject: Reply with quote
sickpup wrote:
EDBANGER wrote:

It was a GSX750R


GSXR or GSXF? 2 very different bikes wirth different frame materials.


GSX750R
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yzf750r
World Chat Champion



Joined: 04 Nov 2004
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PostPosted: 08:18 - 15 Sep 2005    Post subject: Reply with quote
it'd weaken by a fair bit, I should've said. Id buy another frame and put my numbers on to it. Thumbs Up
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sickpup
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Joined: 21 Apr 2004
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PostPosted: 14:02 - 15 Sep 2005    Post subject: Reply with quote
EDBANGER wrote:

GSX750R


Yes I can read and I'll ask again but this time I'll put it in bold letters so you understand.

GSXR750 or GSX750F You see there isn't a GSX750R thats why I'm asking.
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TOM M
World Chat Champion



Joined: 18 Mar 2005
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PostPosted: 14:10 - 15 Sep 2005    Post subject: Reply with quote
Is there a way of strength testing a frame????
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TheShaggyDA
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Joined: 14 Jun 2004
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PostPosted: 14:42 - 15 Sep 2005    Post subject: Reply with quote
Wasn't the Katana the GSX750R?
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EDBANGER
World Chat Champion



Joined: 05 May 2005
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PostPosted: 15:16 - 15 Sep 2005    Post subject: Reply with quote
sickpup wrote:
EDBANGER wrote:

GSX750R


Yes I can read and I'll ask again but this time I'll put it in bold letters so you understand.

GSXR750 or GSX750F You see there isn't a GSX750R thats why I'm asking.


According to google there is a GSX750R but you are quite right, the bike in question is a GSXR750.

Just like this

https://www.motorcycle-training.f2s.com/gsxr750.jpg
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Nolongerhere
Trackday Trickster



Joined: 07 Apr 2005
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PostPosted: 15:37 - 15 Sep 2005    Post subject: Reply with quote
on the whole the frmae will be straighter if it was done in a jig. The bike will not have a handling issue if its been straightened but it will bend again in the event of a big crash!!!! It will be fine!! Thumbs Up
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 17:14 - 15 Sep 2005    Post subject: Reply with quote
TheShaggyDA wrote:
Wasn't the Katana the GSX750R?


GSX750F
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Jack_Cheese
World Chat Champion



Joined: 14 Jul 2005
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PostPosted: 17:21 - 15 Sep 2005    Post subject: Reply with quote
leicester_city21 wrote:
Is there a way of strength testing a frame????


The test is torsional rigidity - the frame is twisted, and the ammount of torque required to twist the frame by one degree or radian is recored. the higher the ammount of torque needed to twist the frame, the more torsionally rigid it is.
Other than this, the manufacturer may apply a force upwards on the points where the swingarm and forks are linked to the bike, whilst placing a load downward on the middle of the frame. This would give an indication as to how much flex there is in the frame.

How do they straighten the frame? Do they just apply a torque to it with a jig, then soften it with a welding torch?

Jack
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Old Thread Alert!

The last post was made 20 years, 198 days ago. Instead of replying here, would creating a new thread be more useful?
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