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Re: 1949 ZM20T Wheels

Crickey!!!!!!!! What next???

Re: 1949 ZM20T Wheels

Don't panic!, it's just a bit of banter...I ran my rigid M21 to work on and off for years...I fitted a B33 engine later on (mine already had the 8" front brake and a Triumph clutch....An ultra reliable machine once previous lash ups were rectified and the chap I sold it to about 20 years back is still using it to ride to his work ...Ian:relieved:

email (option): ian@wright52.plus.com

Re: 1949 ZM20T Wheels

Now you got me thinking, I have the same model and Iam in the process of fitting a sidecar to it, which is an Australian made Dusting and quite heavy. This will obviously place more load on the rear axle. These were designed to haul sidecars with all the lugs cast in the frame.
I have fitted sidecar rated springs to forks and tapered bearings to headstock but can't do much to strengthen rear end.
Might be interesting once complete if it fails whilst belting down the highway!!

email (option): tknalder@iinet.net.au

Re: 1949 ZM20T Wheels

I don't want to get everyone worrying about their rear spindles...I have personally seen two broken ones and have had anecdotal evidence of another which I've no reason to disbelieve...
On the other hand I've been riding and involved with BSA singles for 45-50 years so I've had a while to get a problem and hear about a couple more!....:laughing: ....I don't think this is a very common problem, I merely mentioned it because it happened and it fell within the remit of the enquiry about wheels for this particular model...There are plenty of other problems that are more common!...Ian

email (option): ian@wright52.plus.com

Re: 1949 ZM20T Wheels

My bike is finished but isn't licensed as yet and after careful assembly oil leaks isn't a problem as yet, wet sumping is, which only means draining the crankcase into clean container and putting it back in the tank. Fortunately someone prior to me rebanded the sprocket and did a very good job. The rivets holding the drum still original and look perfect. The amount of miles it will do when sidecar is finished and attached will be minimal so I think it will out last me if its lasted 70 years to date without failure. As Ian said fit a wheel with bolt on drum, however where I am one would be difficult to find. I am aware of 6 spring clutches and have improved the drag when trying to find neutral by fitting a lever with 1 1/6th cable pull compared to original 7/8".

email (option): tknalder@iinet.net.au

Re: 1949 ZM20T Wheels

So now I am confused
Didn't the post war QD hubs revert to the counterbored bolts and flat holes used pre war ?
or did they continue to use the countersunk self aligning bols ?
I have seen both

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