Thanks mate, its certainly my dream bike and all only possible due to a very clever engineer who built it up based on factory frame drawings (BB32R) and as many authentic BSA parts I could track down.
I'm running 2.5" morad (akront) rims that I had (a batch of 20) made through Central Wheel Components in Birmingham the UK, which are the right size for a 3.5" tyre but not commonly available. They were very helpful to a colonial. I managed to find homes for the rest through fellow big wheeled sidecar racers at cost, so they are sadly all gone. Sunbeam S7 also use 16" rims and of course many harleys, but all much wider rims than I was after. I'm running a narrower rim on the chair, which was a mistake as the tyre tries to roll off the rim on hard right handers, so needs to be run very hard to manage that. I recall thats effectively a 2" rim which would be adequate for a solo that doesnt have the side load issues that racing chairs face.
Sadly cant help you with wheel building we have a relatively local specialist, but not much use to you!
The full width hubs with a 16"rim does mean a very short spoke which is a bugger for the wheel builder. My front 8" double sided hub caused him real bother.
I've got a post on the forum under bikes, pics and members section called the road rocket racing sidecar project which follows much of my journey.
16" rims are a great way to lower a bike!
Theres nothing like the smell of burning methanol and castor oil in the morning
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