Pretty much anything not covered by the topics above. Short lived production bikes or vehicles, Electrical, Tires, Paint, Brakes, etc. Use this for tech questions, and "Shoot the Bull" for general conversation, no tech.
as a general comment, 20" rear / 21" front is a common combination of sizes found on pre-war rigid-frame girder-fork sports bikes. 20" front / 19" rear with a slightly larger section rear tyre would be a more common combination for touring bikes and this can sometimes be found on post-war "utility" bikes with various combinations of tele forks and rigid or plunger frames.
The change to telescopic forks and/or rear suspension of various types led the the 18" rear / 19" front becoming pretty much universal. 20" front wheels are rare on tele forks and 21" almost unknown, apart from special machines for trials etc.
same-size wheels in the American style were never British practice
From your post it is not clear if you are trying to replicate the a Bonneville Vincent, or build a non-Vincent, but Vincent-inspired machine. If the former, there are probably better places on the net than this to get answers concerning Vincent esoterica .
There have been occasional specials incorporating Vincent engines in Norton frames, usually with Norton transmissions, but these are machines of a very different character to Vincents and very rare.
There have even been occasional Vincent choppers but they are strongly disapproved of by Vin owners generally, I would say with good reason. Go on an Vincent website and ask for information to help with a chopper and you probably won't get far, although maybe further than trying to buy a machine or parts for such a purpose...
The black paint and gold lining were generic period features used by many makers, and the styling is generally conventional for the period, subject to the structural constraints already mentioned. The wheels were generic bought-out items which were common to most machines of the time
don't know if this helps
3ta, 17 "" "" to 1966 then 18 both
tiger 90 both 18
blah blah blah
6t 50-59 both 19 then till 66 both 18
t110 54-59both 19 then till61 both18
t120 59 -60 both 19 then 19 f 18 r
after 1960 standard fitment on most triumph's was 19 front 18 rear with the odd exception such as thet100s of 67-70 18 both.
taken from roy bacon's triumph twin restoration
Ditto choppers. While chopped Vincents used to be uniformly atrocious kludges usually made by penurious Brits who couldn't afford a Harley, there have been some built recently that are really gorgeous, using new-build engines. Look up the Redneck Vincent chopper for an outstanding example.
Oh, when the Bonneville machine was built the company was doing business as the Vincent HRD Company LTD so it is perfectly acceptable to refer it as either a Vincent or HRD Vincent though not usually as just HRD.
my experience would be that M & B series single-cylinder BSAs, swing-arm and rigid, usually have 19" front and rear with tele forks and some pre-war ones have 20" fronts with girder forks. A series BSAs, pre-unit and unit, should have 19" front and rear. WD machines all have 19" front and rear.
Some post-war lighweights ( C10 ) have 20" fronts, which I suspect is a case of using up old stock at a time when it was difficult to source pretty well anything. Bantams have 19" both ends for rigid frames and 18" for later swingarnms versions.
That said, 18" rear wheels for non-unit bikes are a common "find", having been converted for sidecar use or for better tyre choice. US exports, don't know
On the whole I can see their point, since the Vin is/was a highly original design which represented state-of-the-art design concepts ( even if the execution was a little contentious, shall we say ) which were in some ways - such as the triangulated rear suspension and underslung, stressed engine-as-frame-member - decades ahead of their time, and was the fastest thing on the road in its day with legendary braking. They also had a long and successful record as sidecar speedway and grasstrack racers. To take such a machine and turn it into a highly subjective styling exercise in which form is subordinated to function, I for one see no point in this whatsoever and much to be said against it.
Norvins, h'mmm VOC have accepted them over the years but you can still expect to be less than widely admired for cutting the gearbox off, a change which can't be reversed. Again, from experience they are actually quite rare but highly visible and much-reported when they do appear.
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