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Subframe brackets

Posted: Tue Dec 25, 2018 3:07 pm
by cjvoles
Out for a quick Christmas day ride suddenly noticed the seat position felt different, stopped and got off,both seat subframe brackets broken advice needed please

Re: Subframe brackets

Posted: Tue Dec 25, 2018 7:39 pm
by Blackal
On the aluminium frame? Top ones?

New frame required.

If it is the upper ones especially - the work involved in carrying out a proper repair is prohibitive

Upper lugs are in tension

A common crash scenario

Re: Subframe brackets

Posted: Tue Dec 25, 2018 10:06 pm
by cjvoles
Can they not be welded?

Re: Subframe brackets

Posted: Tue Dec 25, 2018 10:42 pm
by Blackal
Of course they can, but not easily - to a satisfactory (in my opinion) standard.

Re: Subframe brackets

Posted: Tue Dec 25, 2018 10:48 pm
by Hay Ewe^
Hi, any pictures?
I have read and seen pictures of somebody who did have the lugs re-welded.
I cant think where at the moment though, most likely would have been on one of the two 1100s face book pages

Re: Subframe brackets

Posted: Tue Dec 25, 2018 10:57 pm
by cjvoles
This seems to be a major job then,had the bike 10 years a BCR weigh 12 stone rarely carry a pillion or luggage these lugs must be a weak point

Re: Subframe brackets

Posted: Tue Dec 25, 2018 11:07 pm
by MR SHEEN
There is a thread currently running on the Pelican site about such.

Re: Subframe brackets

Posted: Tue Dec 25, 2018 11:38 pm
by cjvoles
Just looked at the pelican thread on this and have to agree with Blackal that this is not an easy or satisfactory repair

Re: Subframe brackets

Posted: Wed Dec 26, 2018 10:27 am
by big rob
During the Boxercup race series these lugs were the first thing to break when the pilots 'dumped' their bikes. They didn't re-frame their bikes after each smash. Have a good search on tinterweb, there is info out there on how the bike can be repaired, it will involve a bit of engineering but it can be done.
Good luck.
Rob :)

Re: Subframe brackets

Posted: Wed Dec 26, 2018 10:41 am
by Mr Charrington
]I had a similar problem ,a few years ago ,with a broken upper bracket .
I simply weld it and forgot about it .
I went to a well experianced proffesional
whose job was specific aluminum welding .

Since then a ride 2 up with top case and side panniers every summer for about 3-5000km in harsh conditions at balkan asphalt roads or..dirt with no prodlem at all.
RIGHT HAND  SUBFRAME BRACKET .jpg
RIGHT HAND SUBFRAME BRACKET .jpg (116.15 KiB) Viewed 2206 times

Re: Subframe brackets

Posted: Wed Dec 26, 2018 11:46 am
by Blackal
Is that not a crack, between the nut and the weldment?

[edit] - it actually looks like a crack - propagating all around the edge of the Heat Affected Zone of the weld.

Worth having a closer look at?

Re: Subframe brackets

Posted: Wed Dec 26, 2018 1:21 pm
by Mr Charrington
You got me worried , thats for sure !
No nothing like that !
It s just some kind of dirt on the weavy excess material of the weld ..if i can express it corectly

Thanks for your concern any way !
IMG_20181226_151125.JPG
IMG_20181226_151125.JPG (717.51 KiB) Viewed 2178 times

Re: Subframe brackets

Posted: Wed Dec 26, 2018 7:38 pm
by nab 301
Loads of posts on here if you search for subframe lugs , I do remember a bolt on repair but can't find the photos now..


viewtopic.php?f=4&t=4558&hilit=subframe+lugs

viewtopic.php?f=4&t=17237&hilit=subframe+lugs&start=30

edit , photo of "bolt on repair" in this thread
http://forums.pelicanparts.com/bmw-r110 ... -lugs.html

Re: Subframe brackets

Posted: Thu Dec 27, 2018 2:00 pm
by Humbug
If anyone could weld it it would be Ian at ETTO motorcycles near Nottingham. A bit of a specialist in aluminium making frames and tanks for one off specials. Worth a look at his website. Nice chap to boot
https://www.ettomotorcycles.co.uk/

Re: Subframe brackets

Posted: Tue Jan 01, 2019 1:41 am
by boxerscott
big rob wrote:During the Boxercup race series these lugs were the first thing to break when the pilots 'dumped' their bikes. They didn't re-frame their bikes after each smash. Have a good search on tinterweb, there is info out there on how the bike can be repaired, it will involve a bit of engineering but it can be done.
Good luck.
Rob :)
thats ok for track bikes, no pot holes, no pillions, no insurance required. I mullered mine at donnington, i had it welded, it looked like pigeon shit on a barbed wire fence, I re framed it, and to avoid a q plate the frame was £1000.00. from BMW The bike still had some perceived value it was a BCR Replika (the good one)

Ask yourself what if it sheared again , It most probably will, it is weaker with welding than the original casting. Would you be happy to sell it on with a glued sub frame attachment? Best option re frame (used) , accept q plate if the bike has no significant value otherwise salvage. I would not ride one with a welded sub frame. If I were the insurer i would not take the risk, I certainly would not buy one either. Unless it is a track tool I think your bike is toast if welded. Phone call to Insurers. accident claim? Pot hole? pursue local authority?

Chris