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D1 plunger rear wheel spindle size
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larryc
burnley lancashire
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September 3, 2020 - 7:46 pm
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I am fitting a rear wheel to my D1 plunger build, the wheel I am fitting did not have a sprocket so I fitted a new one, new rim tape tube and tyre, bearings ok..... all ready to fit, but, the spindle I have is not the correct diameter, it's too small.

Reading other posts it seems there are two sizes, and two sizes of bearings, it looks like I need a new 'larger diameter' spindle, my question is, are all the wheel nuts, locking nuts etc the same size on both spindles and it is just the central unthreaded section of the spindle which is a larger diameter?

also, does anyone know who stocks them?

Thanks Larry

D1 plunger, T20 cub, working on a 1955 T20 cub plunger

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lbayorkie
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September 4, 2020 - 9:05 am
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The spindle is larger in diameter along it's whole length so new fittings will be needed.  I don't think you can buy new spindles but they do come up for sale on eBay either as individual items or in hubs. 

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larryc
burnley lancashire
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September 4, 2020 - 3:34 pm
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lbayorkie said
The spindle is larger in diameter along it's whole length so new fittings will be needed.  I don't think you can buy new spindles but they do come up for sale on eBay either as individual items or in hubs.   

thanks, I will look out for one or complete new wheel, these mistakes are made to test us, I should have checked that the spindle fitted first!

Larry 

D1 plunger, T20 cub, working on a 1955 T20 cub plunger

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Number6
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September 7, 2020 - 8:14 pm
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I have it down as 9/16" BSF, BSA part No. 90-6092

Supposed to come with a nut, as a set.

See also, for other parts:

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From around February onward I managed to get hold of stainless versions of most of the nuts etc., eBay etc.

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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larryc
burnley lancashire
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September 16, 2020 - 4:44 pm
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Number6 said
I have it down as 9/16" BSF, BSA part No. 90-6092

Supposed to come with a nut, as a set.

See also, for other parts:

** Please log in to view **

From around February onward I managed to get hold of stainless versions of most of the nuts etc., eBay etc.  

Thanks, I have bought a second hand wheel with spindle and most fittings, so I am sorted now, so it is tyre off the old one and refurb the new one.

another lesson learned when buying 2nd hand wheels!

thanks All, larry.

D1 plunger, T20 cub, working on a 1955 T20 cub plunger

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Number6
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September 18, 2020 - 6:00 pm
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http://livinginthepast-audioweb.co.uk/imagex/misc/th_thumbsup.gif

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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Wagga
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November 21, 2020 - 11:43 am
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larryc said
I am fitting a rear wheel to my D1 plunger build, the wheel I am fitting did not have a sprocket so I fitted a new one, new rim tape tube and tyre, bearings ok..... all ready to fit, but, the spindle I have is not the correct diameter, it's too small.

Reading other posts it seems there are two sizes, and two sizes of bearings, it looks like I need a new 'larger diameter' spindle, my question is, are all the wheel nuts, locking nuts etc the same size on both spindles and it is just the central unthreaded section of the spindle which is a larger diameter?

also, does anyone know who stocks them?

Thanks Larry  

Hi Larry, do you still have the small spindle?  If so, would you be willing to sell it? I'm trying to find parts to build a rear wheel for a rigid. 

Regards 

Pete

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GlenAnderson
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November 21, 2020 - 11:59 am
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It sounds like you have a rear wheel for a rigid machine. Pictures/measurements would help. You cannot just “swap the spindles” the whole assembly is different. 

There are people on the forum in the opposite position to you, who have a plunger wheel and a rigid frame. It may make more sense to look to do an exchange of wheels with someone than to modify what you have; even if it means removing the tyre and sprocket again. 

While it would be possible to make up some new shouldered nuts to allow you to fit the wheel to your plunger frame, BSA increased the size of the spindles for a reason; that being the fact that the smaller one is not strong enough to withstand the additional forces put on it by the rear suspension movement, so I could not in any conscience advise that route. 

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rhi010
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November 21, 2020 - 2:21 pm
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Yes I modified the plunger type wheel nuts to use a plunger wheel in my rigid, the plunger spindle fits the drop outs,

Turned off just enough of the sleeve so as to retain the adjusters but to enable the nuts to clamp the frame.

Not got to sorting out the brake rod yet. 1605968305721824358488.jpg1605968389218434178828.jpg

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larryc
burnley lancashire
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November 27, 2020 - 4:21 pm
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Wagga said

Hi Larry, do you still have the small spindle?  If so, would you be willing to sell it? I'm trying to find parts to build a rear wheel for a rigid. 

Regards 

Pete  

Hi Pete just noticed your reply, I do have the spindle, nuts, bearing covers and spacers, send me a PM if you like

D1 plunger, T20 cub, working on a 1955 T20 cub plunger

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Number6
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November 27, 2020 - 5:28 pm
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While it would be possible to make up some new shouldered nuts to allow you to fit the wheel to your plunger frame, BSA increased the size of the spindles for a reason; that being the fact that the smaller one is not strong enough to withstand the additional forces put on it by the rear suspension movement, so I could not in any conscience advise that route.

S-P-L-A-S-H moment – that's why the plunger spindle is thicker. The 'forks' (what's the correct word?) that hold the spindle on either side (where the chain adjusters are) can move independently, and only the spindle can prevent this, hence was strengthened (i.e. make from thicker rod). Due to side forces acting on the rim, trying to twist the wheel, because each plunger spring can move independently.

freaked-out_gif

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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GlenAnderson
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November 27, 2020 - 6:01 pm
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Exactly. 

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