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F: Frame Series ‘D’ Rear Bodywork mounting to Series ‘C’ Comet


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VOC Member
Will a D solid rear axle simply replace a C solid rear axle?
Yes - I’ve never tried it but C tommy bars are identical on single & twin so the D twin spindle must fit a Comet. The bracket shown as a thoughtless idea was more or less what I had in mind. If you dummy up something of that sort, two drilled plates some spacers and studs, you can mount the cowl and see where the bottom lugs fall. You'll need to compress the rear suspension as load on the fully sprung seat will put more pressure on the springs than a Comet normally experiences. Once you have it levelled to your satisfaction you can see if a shouldered peg bolted to each pillion plate will carry the bottom lugs. I use my plug socket on the special nuts used here and on the rear wheel spindle.
My avatar shows the Knight with a cast rear wheel. This used one brake, standard Vincent drum on the left. There should be no problem having both brakes fitted.


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VOC Member
Answer, from Calle who built a Victor lookalike

There are certainly several different solutions to your problem.

As shown by all posts on the forum, you must decide if you want to make a Victory copy or just mount the tail on a Comet. My answer is based on the option to build a Victory copy.

If you got an original rear fiberglass Rear end cowl assy (SL4), which is complete and not destroyed, leave it as it is and order a new fiberglass part and create a new inner frame. I think it's impossible to customize a Prince or Knight tail to a Comet without destroying the original parts.
In any case, you must remove the internal frame and modify to fit the Comet frame. This will more or less destroy the original parts.

If you choose to complete a Victor project, I can assist with photos and my experiences.

The pictures are from 2010 and the machine has now got a Norton AMC gearbox, Newby belt and another silencer.



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My measurements on C Comet and B Rapide are -
Comet/Rapide UFM seat pivot (top tube) width = 5" >relates to a dim
Comet/Rapide width of outside of the rear plates = 10½" > relates to b dim
Comet seat pivot to swing arm pivot = 14"
Rapide seat pivot to swing arm pivot = 15¾"

My "minds gears" are slowly turning, possibly at the wrong ratio, but moving none the less.
I do not want to modify a perfect D rear section, if possible.

So if the Vincent D closed used the swing arm pivot for the bottom attach, this means the top pivot (for a D closed rear section) must reside higher, on a twin Vincent than the C seat pivot???

So I am picturing , for the Comet, fabbing a bracket like I showed below, raising D section pivot 1" or so .
Bracket narrowed to use the lower two UFM tubes, as they are narrower 4", rather than seat tube which is 5".
At the bottom Comet side plates, below the swing arm pivot fabbing some 1/2 " studs reinforced with 1/4" plate.

What about that stupid idea? CometUpperMount4c.jpg
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VOC Member
SL ^ is a piece of fibreglass, bonded into the main shell which is there to act as a preventer of dirt etc being thrown forwards off the rear wheel and forwards onto the rear carb and cylinder. ET29 As is the hinge for the front end of the 'D' saddle. Regarding using the rear plates for a mount. What are you going to do about clearance on the silencer?


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VOC Member
How many FT286, FT286/1, FT287 are required to secure a closed D rear section?
Any pictures of these FT items?

What is difference between 286 and 286/1? left /right? different length?

Are the nuts and spacer to secure an open D, at the bottom swing arm, the same as a closed D?

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There are two of the FT 287s, one each side. There is one each of the (Davidd's reply just came in) FT286 and FT 286/1 One (FT 286/1) just has a flat to clear the back of the clutch housing.


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I found pictures I had of Sam's D series at Butlers Farm 2007. I now see the long hex nut on the right side and the trapped long hex nut on the left side to allow swing arm secure.

Also the shouldered nuts on both sides to secure the D series rear frame.
FT286_1AndFT287RightTwinD.JPG FT286AndFT287LeftTwinD.JPG
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Yes, I had the frame off the open D, but did not take photos. It is much more clear on Sam's Knight.

I owned that Knight for 30 years. I made all the enclosures and the frame for the tub.




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VOC Member
I received an D Series enclosure MFT288 upper pivot sleeve today.
0.625 OD
0.387 ID
7.50 length

so the gap between the D series enclosure frame upper pivot is 4". This leaves 3.5 for frame pivots.
Are the upper pivots the same length? 1.75"?
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