That was James Bond with a BSA rocket equipped bike.
PR: Proprietary Items Post war longer seat for C Shadow
- Thread starter Steve F
- Start date
Marcus my handsome, to use a Cornish colloquialism, have you ever weighed OPC 194 when fully fully loaded, I think it would terrify me, but then again I am a weakling .
The first photo shows what can happen with a 'simple' suspended seat and a big bump in the road surface
The second photo shows what change I made to my suspended seat installation to ensure there was no repeat failure.
the added strut is just a simple length of steel that takes all the horizontal forces away from the seat mount lugs.
The second photo shows what change I made to my suspended seat installation to ensure there was no repeat failure.
the added strut is just a simple length of steel that takes all the horizontal forces away from the seat mount lugs.
I've broken seats there that have stock suspension. I doubt if full suspension did it. I thought the gussets were too small at the front mount.
Cheers, John
Morning Martyn , Did you take out the pivot tubes from the front and rear fittings. Cheers Bill.
Hi Bill, Nope - left them in place. Makes it easy to go back to 'standard' if/when I want the bike to be original
regards, Martyn
As an old back yard mechanic, I would have thought that was the trouble, I have been doing it to my bikes for years.
But you have overcome your trouble with the extra strut. Cheers Bill.
But you have overcome your trouble with the extra strut. Cheers Bill.
Surely the problem is the angle of the rear seat supports, the more oblique the angle of the rear seat supports in relation to the seat, then a greater force will be exerted to the front seat bracket as the force (weight) is exerted downwards and rearwards when the seat is sat on, and that force is increased when you strike a bump or pothole (there are now many) in the road. If you go fully sprung with a custom made rear frame (sledge) of the type that Cyril Maylem used to manufacture, then it is most unlikely that you will ever fracture a seat front bracket as long as it has been manufactured properly in the first place, because with this sort of rear seat support the seat is not trying to collapse rearwards.
Absolutely right Peter, when looking at the "D" seat, oil tank & tool box frame it has a much stronger set up at the back of the tank but D's have the lower frame anchor on the RFM pivot bolt still creating a massive pull load of the top mounting, thats why I built mine as far Bach as possible even making the S/S foot rest plate longer, but to bring them back so a vertical drop from the rear of the seat where it wouldn't put any stress onto the forward seat mounting. But that wouldn't look right and a Vincent must look right. !
bananaman
bananaman
Attached diagram of a rear rack is from "Know Thy Beast", first edition. You will note that it provides for a fully suspended seat and incorporates a strut that attaches to the rear of the UFM that takes any turning moment loads away from the front legs of the seat frame.
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