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D1 Spindle Diameter
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lbayorkie
Otley, West Yorkshire
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November 28, 2018 - 9:17 pm
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I have recently purchased a rear wheel for my 1950 D1 Rigid. Seller thought it was a half inch spindle which was perfect. 

He now tells me that its '9/16BSF (16 T.P.I)' No idea how its been measured but this seems a bit strange. As far as I knew there were no spindles of that diameter. Anyway I have option not to take delivery and get a refund.

To be honest I struggle a bit with BSF, Whitworth and imperial in general so please excuse me. Is 9/16 BSF equivalent to 1/2 inch?

By the way I am told the wheel is early, and as its not chromed I tend to believe it.

Hope someone can help

 

Thanks.

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Blue Heeler
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November 29, 2018 - 12:18 am
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Without digging my D1 rigid out,I can`t answer on the exact size...but I believe BSA did up the diameter after early spindles developed breaks.I know of two that have broken,one owner on here and also the famous intrepid D1 Rigid adventurer...Bart has a book on her travels for sale.

Are you sure the seller wasn`t quoting on the nut size.I can check my D1 Plunger,but can`t access my Rigid D1 at the mo.

Hope you can get your new purchase to fit,I`d wait until it arrinves,it may be ok.

Blue

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lbayorkie
Otley, West Yorkshire
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November 29, 2018 - 7:51 am
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Thanks for the reply. Spindle diameters definitely did change but reading previous posts there is considerable uncertainty about when the change took place.  This wheel is painted, no chrome so definitely early. Seller thought about 1951 which is during the period when I think the change took place just to confuse matters.

I suspect 9/16BSF is the nut size but does this equate to a 1/2 inch spindle is the question?

Alan

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Piquet
West Norfolk
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November 29, 2018 - 10:39 am
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I think the early rigid frames had the smaller spindle size and the same size was used on the first plunger models but because of the difference in suspension movement from side to side resulted in breakages so the size was increased. Probably difficult to pin down the date as affected bikes may have been modified under warranty after sale.

For the spanner/thread size, have a look here

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I'm not a complete idiot ............................................ some parts are missing.

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johnsullivan
east sussex
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November 29, 2018 - 11:08 am
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[Permission to view this media is denied]
another useful site... usual disclaimers.

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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BonesCDI
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November 29, 2018 - 7:42 pm
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Plunger rear is 15mm diameter with a 9/16BSF thread of 16 TPI (threads per inch)

Rigid rear is 12mm diameter with a 7/16 BSF thread of 18 TPI

The thread diameters are the actual diameters not the BSW/BSF spanner sizes...... 

regards Bones

Running and project bikes from 1912 -2005..........She hasn't said stop yet.........

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lbayorkie
Otley, West Yorkshire
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November 29, 2018 - 8:43 pm
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Thanks very much for all your help. Bones- I have already committed to take delivery of this wheel, so it looks like its going to be back on eBay very soon. Hope I dont lose too much money on the deal.

I really hoped that I had found the right part after patiently waiting for over a year of not being able to use the bike. Back to scouring eBay now I suppose!

 

Alan

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