Most likely crank figures not rear wheel........around 8% diff on most bikes.......looks better on paper........manufacturers still do it today.
It happens that for the past 26 years I've had a 1963 West Coast Rocket Gold Star, but I only discovered it in my garage this past weekend.I have pretty nice 1963 West Coast Super Rocket. The West Coast HHC engine is what was used for all factory Rocket Goldstars.
It takes a bit more than that. BSA Parts Service Bulletin No. G.21 says all the parts for the RGS are listed in the Super Rocket and Gold Star Spares Catalogues, except what follows in the bulletin. What follows are nine pages of an estimated 300 parts. Although many are just nuts and bolts to attach various pieces, and some are essentially duplicates (e.g., front fork when lights are, or aren't, fitted), but 41 items have + next to them, which is explained as being new components not used on other models. Interestingly, one of the items with a part number and + is "Engine complete" and another is "Frame complete."Change the tank , seat plus a couple of other things and you are there.
"Royal Enfield... never disappeared"I've left off a few minor players, like Ariel and Brough-Superior, but motorcycle brands that made comebacks are/were: BSA, Excelsior-Henderson, Indian, MV Agusta, Norton, Royal Enfield, and Triumph. Indian should be counted at least three times in this list, and Norton at least twice, but Royal Enfield arguably doesn't belong on it since it never disappeared.
If there's anything these have in common it's that, with the exception of Excelsior-Henderson, none of them had been out of production for as much as 30 years when the names were revived, so they retained some degree of brand recognition with the buying public. However, E-H only lasted two years before going bankrupt. Despite name recognition, Triumph is the only exception at this point because it's too early to tell with BSA.
Looking at the above list of expensive mass-market failures, the odds of someone reviving the name Vincent in other than a small-scale vanity project, or to make mopeds for underdeveloped countries, seem to be pretty small.