toppers3933 - Member
Was given a ladies BSA sport roadster today...
Keep an eye on eBay. Start accumulating the necessary spares.
For example, I picked up a NOS Brampton chainset recently. It's actually 60s stuff but there's not a significant difference between that and the 30s stuff.
If it has the original 3 speed hub, then it likely will be a BSA one. I haven't taken the rear sprocket off mine (Silver Sunbeam) but it looks like a screw on track cog, so that's easily replaceable. If it has been fitted with a S-A hub then there's plenty cogs available.
Don't get sucked in by some of the supposedly NOS stuff which is actually new Indian bike parts. They do the job, but the chrome is dire and they rust instantly.
If you don't know how to remove and insert a cotter pin properly, it's worth learning how. There's a right side to insert from. The reason I suggest that is it's worth pulling the old BB to check on it, note which model, and then watch out for NOS coming up on eBay.
BSA stuff from that era is generally very good quality, so replace your bearings with NOS and the bike is good for another 80 years.
MidlandTrailquestsGraham - Member
...My main concern about riding it is wearing out the chainrings and sprockets. I don't know where I'd get replacements, other than having them custom machined.
The chainrings are readily available, I'm not sure about the Tri-velox sprockets, but generally most of the stuff in those days was designed to come apart and use common parts, so you'll probably find there are sprockets to fit.