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PostPosted: Fri Dec 22, 2017 11:07 am 
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On the street

Joined: Thu Mar 26, 2015 12:06 pm
Posts: 18
Country: USA
Bikes owned: T500
I seem to be able to find a lot about putting tubes in and on placement but I don't find anything on sizing. The frame has about a 1"od and I would guess a pretty heavy wall DOM tubing. I don't think that is needed for bracing so I am looking at 1" od x .083 4130 chrome moly for the bracing thinking the moly will be strong enough for bracing without adding a lot of weight. This is for a race bike.

Can anyone that has done this modification chime in here?

Thanks,
DC


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PostPosted: Sat Dec 23, 2017 8:44 am 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5981
Location: Illinois
1'' x .059" is probably strong enough for the bracing tubes.


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PostPosted: Tue Dec 26, 2017 8:27 am 
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On the street

Joined: Thu Mar 26, 2015 12:06 pm
Posts: 18
Country: USA
Bikes owned: T500
good, I've read where structural tubes needed to be at least .128 but you can't find anything on just bracing on a DOM tube frame.

Thanks,
DC


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PostPosted: Tue Dec 26, 2017 9:53 am 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5981
Location: Illinois
That sounds wrong to me. Stock GT750 tubes are 3.2mm or so (1/8") and are heavy as all get out. Tony Foale had some recommendations in his book - I think he said either 18 gauge (.049") or 16 gauge (.065").


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