BSA A10 Super Rocket - New Final Drive Chain

[@jjrider6758]

5/8 x 3/8 is the size/pitch of the sprocket teeth, so - as you discovered - the overall widths of the chain can vary and still be intended to fit the same size sprocket.. The gap between those outer plates and inner plates looks like an 'O' or 'X' ring chain would look, standard chains would normally have the plates pretty much touching.. I can't vouch for BSA but most British bikes were made in an era when seal-type chains didn't exist, so no allowance was made for wider chains, I do know that on some bikes it isn't possible to fit chains with seals because they would chew the back of the Primary Chaincase and/or gearbox.. Also, drive chains can flail about a bit at speed, so keep a careful eye on it to make sure it doesn't eat something expensive !..

[@CharltonsClassics]

@@jjrider6758 Thanks for the comment as always 😊. I kind of stumbled across that chain when I was deliberating on the rather expensive RK X-ring options. Thought it was worth the risk at only £20 and I confirmed that it wasn’t an O or X-ring with the supplier, but it is quite wide as you can see. A few days after, I had my head under the bike near the centre stand and you can actually see the clearance to the engine, as you can from the back of the bike at a squint. Plenty of clearance for this one so I’m comfortable with it and I made a slight adjustment to the chain slack after my camping trip. So I think we’re all good👌🏼. Need to make sure it’s properly dried after each wash and lubricated as the rust on the old one was a bit of a surprise I must admit!

[@GordonBird]

The chain is 5/8" X 3/8" as the previous guy said! My first bike was a Gold Flash with Watsonian Sidecar in 1963...No Metrics Then! BSW-BSF-BA- Cycle and butressed!.None of your ISO stuff!. Latewr came UNF and UNC!. This with S.I. in the mid 1960s. Best to yoiu all! ...LA5 Warton Lancs.Also...Measure DIAMETER od Wheel Sprocket at Chain Pin Centre and Gearbox Sprocket. Make sure that One will divide exactly into the other! Then you wont get loose and tight sections of chain!.Tooth Number is not the be-all on this!,,,

[@CharltonsClassics]

Thanks for your comment there. And for the advice regarding the sprocket teeth. I hadn’t thought to do that, although when I spin the wheel the chain slack is uniform throughout its length, so no noticeable tight spots. Will double check in any case 😊

[@4418CARLOU]

I would put the new c clip on.

[@CharltonsClassics]

It was my intention to use it but it was just so damn difficult to work with. To be fair, I did go for a long ride after fitting and it was absolutely fine so I have confidence with this one. I also double checked the rivets and they are the same distance as the old chain so should be ok🤞🏼