Poppy's 1949 Longstroke Bitsa - different models of crinkled rear hubs?

[Big_Ben]

Hi All

The hunt to find the needed parts continues.

I "think" that my 1949 plunger frame needs rear hub part number 67-6126, is that correct?

There are quite a few hubs and wheels on line that I could use or get built up, but inevitably none of them say (or know) the part number.

As far as I can see they all look identical, can any of the experts comment if they all the same?

And, are any of these suitable?

Does anyone have a suitable rear brake assembly and axle / spacers they wish to sell?

Thanks as always,

Poppy.

[muskrat]

G'day Poppy.
Yes that is the correct part #. Draganfly has a good parts list with pics of bits you need https://tinyurl.com/y8prr67c
I'm no expert on other models that have that "type" of hub.
Cheers

[Big_Ben]

Thanks Musky.

I've been using Draganfly's images, but it can be quite hard to work out the specifics.

Fingers crossed for the right parts.

Keep safe,

Poppy

[Swarfcut]

 Poppy. I'd hazard a guess that first wheel is from an early Swing Arm model.....the Plunger spindle has a different style at the tommy bar end. Shame no views of the right hand sides. Drags are good at picturing the actual parts in the majority of cases.

 All crinkle hubs use the same basic pressings, but....

 Plunger hubs have two threaded bearing retaining rings, (one each side)  plus a raised centre to the right side bearing cover.

 S/A hubs have only one threaded retainer (sprocket side), right side bearing cover is flatter.

 A50/A65 hubs have provision to mount the speedo drive on the right hand side.

Wheel bearings are the same for all plunger and early S/A hubs. Drum/Sprocket bearings differ.

 Spline drive from the sprocket centre is common to all.

 You need to decide on whether  both wheels  and hubs come from the same model/year or the bike remains a bitza.

 Sourcing plunger parts from 1951 (or therabouts ) and later plus early 1954/56 S/A will give the better 8" single sided front brake.  With the fork ends you have, I can't be sure this brake will fit on the legs with the cable guide. Reckon these are for the earlier 7" steel backplate type brake.  But a later full width iron hub  with 7" or 8" brake (1958 onwards)  should  fit the split cap type fork sliders.  These latter wheels come in 19" rim sizes for the A7/A10, 18" from other ranges eg B40, C15, requiring a change of spindle to fit your forks.

The Plunger rear brake is also pretty foolproof. Design features a reversed lever, a well set up brake will lock the wheel with ease.

 Contemporary B Series Plunger models share the majority of running gear. Here rear sprockets come in different tooth widths, to suit  chain size for differing power outputs. Drum/sprockets differ for plunger and early S/A bikes, but look very similar at first glance. ebay sellers haven't a clue in some cases, so again do your research.

 42 teeth on the rear sprocket is good, 46 teeth standard on a 500, dinner plate sprocket with 49 teeth is for sidecar use.

 Swarfy.

 Additional. These notes apply to plunger and early S/A wheels, and later  A50/A65 models, fitted with 18" QD Crinkle Hub rear wheels. Ariel Alloy full width hubs are completely different, as are later A7/A10 with cast iron full width hubs. A50/A65 rear brake drum/sprocket is a slightly different design, so not a straight swap.

[Big_Ben]

Thank you Swarfy, what a minefield! Thank you so much for your help.

At present I don't have any parts for the rear wheel assembly, so I guess it's a wait and see what turns up online.

Poppy

[Sluggo]

This SHOULD be a very useful topic, And I would strongly suggest a pared down, Wheel-hub ID thread made a sticky, (Either clean this one up as it concludes, or start a strictly tech version).   I have issues figuring the wheels out and need to on some of my projects, they ARE NOT ALL the same!!!!  Unit vs preunit, singles and twins..,. sheesh.  I can contribute to a tech ID for stuff in my inventory, but still figuring it all out.,

I started work on my A65 pile, Sheesh,,,,!!! What a mine field, all sorts of one off weird parts and US West coast vs east coast variants.  Compy models vs grey porridge,, For an example I sold a few years back a 1967 BSA A65 Hornet to a local guy, bike had history and so did the buyer.  He came back distressed, seems the wheels are not compatible., The 67 Hornet used a special axle. Who knew?   We went thru hell and 2 days of searching and turned one up in my storage.  Luckily, on unit stuff, I have a great guru,,, Another guy here in Oregon who knows all the obscure Compy model trivia.  Gary, He contributes over on Morgans Brit bike forum and the archive on the Spitfires-Hornets etc.

But this thread could be super helpful.   I sorted out some of the Triple tree-stanchion tech, I started on a tech thread but life got in the way, but in a better place now, so time to get that done.

[Big_Ben]

Well, luckily I'm not in a huge hurry.

This is the only plunger rear wheel I'm finding, and either I'm being a cheap ass or it's waaaay over priced...

Lot of money for a rusty wheel AND then international shipping would be awfully expensive.

https://www.ebay.co.uk/itm/363697962569?hash=item54ae167e49:g:aZoAAOSwc7Nh6fB9

[Rex]

Nope, it's way over-priced. 

[Big_Ben]

Stands with the morning's first cup of tea, checks forum, looks relieved...

I mean, don't get me wrong, if they can get that price, good for them, but they're not getting it from me!

[Swarfcut]

 Poppy. There are plenty of the bits you need in the UK. Like buses, there are none, then 3 come at once. Same with magnetos, timing covers, barrels... you name it. Time to hone observational skills, bide your time, do something else betweentime. Don't agonise....a choice will appear.

 That wheel is from a B Series, to me it looks like an 18" rim, trials bike. Well worn sprocket teeth, brake lever strictly speaking is not the more widely used A7/10  stubby type. Shell cover for the right side bearing is correct,  (I viewed the ebay listing) so note what it looks like for comparison with other wheels.  Spindle and associated spacer look the correct ones, so  again note to memory that is the sort you need.

  Certainly one to avoid. Anything with Gold Star in the title should be approached with caution anyway.....brings moths to the flame.

 Plunger Rear Brake backplates have minor detail changes over time. Best one is a later version with an internal bracing bar welded across the centre. Sprocket teeth are integral with the drum, so a worn sprocket has little value except as core material for modification.

 Swarfy

[Big_Ben]

Time to hone observational skills, bide your time

18" rim

Well worn sprocket teeth

brake lever strictly speaking is not the more widely used A7/10  stubby type. Shell cover for the right side bearing is correct,  (I viewed the ebay listing) so note what it looks like for comparison with other wheels.  Spindle and associated spacer look the correct ones

 Plunger Rear Brake backplates have minor detail changes over time. Best one is a later version with an internal bracing bar welded across the centre. Sprocket teeth are integral with the drum, so a worn sprocket has little value except as core material for modification.

 Swarfy

Absolutely. No rush, besides there's plenty more to find and fix on the bike.

As I understand it, the Plunger A7 should be 19" front and back, yes?

Yes, gathered that on the worn sprockets.

Good to know on things like the brake lever and brake cover. I'm gradually gathering the information so will hopefully recognize when the right things come available.

Thank you again for your time and knowledge.

Poppy

[Swarfcut]

 Poppy. Yes, standard set up is 19" rims front and rear.

 For folks new to these bikes I would recommend a copy of Roy Bacon's book on BSA Twin and Triples Restoration. Published in the 1980's this contains a wealth of  Model History/Technical Data/Pictures/Part Descriptions, possibly of more interest to owners of later bikes, but nontheless useful for Longstroke owners.
   Also commercially available reprints of parts books, (sadly the Longstroke is overlooked but available in the Forum Literature section) are worth having for a hard copy in the workshop, along with collated reprints of BSA Service Sheets. These  are also in the Forum Literature Section thanks to the efforts of esteemed members. So, you can print off as required, or buy ready made. These Service Sheets cover all aspects of repair as well as technical data and are available covering the pre unit A range from start to finish.

 Swarfy

[RDfella]

Love the wheel ad - 'in great shape'. Would hate to see a rough one - and they've got the decimal point in the wrong place.

[Big_Ben]

Hi Folks

Like buses on a rainy day, there have been no suitable wheels for a while at anything other than silly money.

As far as I can tell, this is a suitable hub to use as a basis for a rear wheel.

I know the sprocket is on it's way out, but beggars cannot be choosers.

That being said, it does look rougher than a badger's idiot!

Is this at least the right type?

Many thanks

Poppy

[Big_Ben]

More pics