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Jul 10th, 2022
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Joined: Oct 2012
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knuckle head
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knuckle head
Joined: Oct 2012
Posts: 6,554 Likes: 366 |
My neighbor has a 39 BSA 500 side valve....He had a wreck in 1980 and the bike has been stored since then..The front girder fork is bent but not destroyed....one down tube is kinked so at the least it will need replacement. I looked at the dust-covered bike in a dimly lit corner of his garage..The question is, are the tubes mild steel? I assume the other parts are cast steel, aka. malleable iron, brazed together? I have offered to look closely at the bike in my home shop and if possible do the repairs..
61 hot rod A10, 89 Honda 650NT .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
“
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Joined: Aug 2001
Posts: 9,280 Likes: 226
Britbike forum member
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Britbike forum member
Joined: Aug 2001
Posts: 9,280 Likes: 226 |
I do believe that the lugs are malleable cast iron, with mild steel tubes pinned and brazed into them, in a hearth.
They may not all be pinned.
Amateur Loctite enthusiast.
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Joined: Aug 2001
Posts: 5,256 Likes: 147
Britbike forum member
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Britbike forum member
Joined: Aug 2001
Posts: 5,256 Likes: 147 |
Sounds like a worthy winter project ! How ‘bout some photos before it gets cleaned up? 👀
Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65LA (now single carb)
‘93 K1100RS heavy metal (should be gone, still here…)
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Joined: Oct 2012
Posts: 6,554 Likes: 366
knuckle head
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OP
knuckle head
Joined: Oct 2012
Posts: 6,554 Likes: 366 |
61 hot rod A10, 89 Honda 650NT .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
“
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Joined: Jul 2012
Posts: 2,132 Likes: 37
Britbike forum member
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Britbike forum member
Joined: Jul 2012
Posts: 2,132 Likes: 37 |
https://jakerobbinsvintageengineering.co.uk/girderforkrepairI don’t know if he would know, but jake robbins is a UK girder expert who might be able to answer an email? Obviously you’re not going to send a set of forks across the pond.
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Joined: Jul 2012
Posts: 2,132 Likes: 37
Britbike forum member
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Britbike forum member
Joined: Jul 2012
Posts: 2,132 Likes: 37 |
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Joined: May 2004
Posts: 5,467 Likes: 274
Britbike forum member
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Britbike forum member
Joined: May 2004
Posts: 5,467 Likes: 274 |
The lower fittings for the axels are forged
The mid fittings joining the tubes can be either forged steel or cast malleable iron
AFAIK BSA always furnace braised all tubing
Tubing is plain carbon but it is tapered
Bike Beesa
Trevor
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