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What Model Bantam is this rear wheel from?
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lbayorkie
Otley, West Yorkshire
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December 16, 2018 - 4:30 pm
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Hi Mags

You have raised a very interesting and critical point. Where should the axle diameter be measured? The feedback I received was that there were two spindle options: 9/16 and 1/2 inch where would these dimensions have been measured at?

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Blue Heeler
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December 16, 2018 - 5:35 pm
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Alan,

The 1/2" measurement I gave you for the spindles on the wheels I bought for my `54 D3 Plunger was done by vernier caliper on the shank....because that`s what you measure before sourcing replacement bearings...but,but,but,it`s the diameter of the shouldered wheel clamping nuts that determine if they`ll fit into the bike with these early Bantams,unlike the later ones where the spindle itself sits in the swing-arm,with flat nuts securing 🙂

I`ve just looked back at an earlier thread where you say your spindle is 7/16"(11mm),so you have a very early one there.

Nonetheless,before buying a wheel,you need to measure the diameter of the locating area in the rear frame,so you know what wheel setup to purchase,ie one with the correct dia shouldered nuts.

Blue.

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lbayorkie
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December 16, 2018 - 6:28 pm
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By shank do you mean the unthreaded portion (covered by the spacer)? If so that explains why when I use my vernier on the threaded portion of the spindle on the wheel currently fitted to my bike it reads 0.45inch/11mm. I was expecting it to be half inch but presumably 0.05 inch is lost when cutting the thread. 

The wheel nut across flats is 0.816/21mm. The external diameter of the protruding collar is 0.55/14mm and the internal diameter is 0.38/10mm. These fit the slits in the frame just right (its definitely a 1950 frame so this is what I would expect)

All the problems I have are with the rear wheel that came with the bike. As I said its a plunger rear wheel which has had collars insterted to make the smaller diameter spindle fit the wheel and new sealed bearings I bought. I purchased the ebay one because it was advertised as a genuine 1/2inch spindle one and I was planning to simply swap it over. 

Im going to place a separate post soon for advice on how to get my original wheel working properly because even with the mods its just not right. 

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Blue Heeler
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December 16, 2018 - 6:56 pm
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Yes that`s right,the portion between the threaded ends of the spindle.

I sympathise with you being new to bikes and being thrown in at the deep end with modified components,those situations often flummox even the experienced when they pop up.Hopefully we can help you get to the bottom of the problems,but this is one of those types of job that isn`t as easy as standard ones with original parts to advise on,without actually seeing it in the flesh,but we`ll get there.

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cocorico
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December 17, 2018 - 8:08 am
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lbayorkie said
By shank do you mean the unthreaded portion (covered by the spacer)? ... 

If you are unsure about the terms used, Google is your friend.

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