Primary chain

[Nomad54]

Looking to replace the primary chain on my 1963 BSA a10. What is the best chain to use and what size, number of links etc ? Is it better to use imperial size or use metric.? I am ok with the rear chain.
Tom

[KiwiGF]

Just make sure u don’t get a cheap chain with “split rollers” (designed for low speed applications) as these will disintegrate in the primary. Speaking from experience on a B31 which has a similar primary.

[muskrat]

G'day Nomad.
I used these on my A7SS racer (before I converted to belt). https://www.classicmotorcyclespares.com/default/primary-chain-bsa-a10-swinging-arm-69l-1954-62-genuine-renolds.html Modern equivalent is 428.
Cheers

[limeyrob]

I recall those split roller chains. There was a phase of passing those off as OK for bikes ads they were half the price but I recall the rollers would open up.  They still turn up so its always worth checking to make sure you don't have on on a purchase.

[Triton Thrasher]

I recall those split roller chains. There was a phase of passing those off as OK for bikes ads they were half the price but I recall the rollers would open up.  They still turn up so its always worth checking to make sure you don't have on on a purchase.

Madras Enfield used split roller primary chain on new bikes, as recently as 1988.


The chain fell to bits. What a surprise.

[chaterlea25]

Hi Nomad,
I have "Regina Gold" primary chain fitted
A lot of lesser chains have thicker side plates which can cause clearance issues
There are some reports that Renolds chain is not what it used to be ??

John

[KiwiGF]

Looking to replace the primary chain on my 1963 BSA a10. What is the best chain to use and what size, number of links etc ? Is it better to use imperial size or use metric.? I am ok with the rear chain.
Tom

Maybe just order from Draganfly, 20 quid ish

[Black Sheep]

I use Renolds. Works fine.

[sean]

put a renolds on mine .......imperial not metric

[limeyrob]

Renolds for me too. Only about £20

[BagONails]

Regina on mine, new chain, engine sprocket and clutch chainwheel. Two years ago, not had to adjust it yet.   

[CheeserBeezer]

As with most things, you get what you pay for! My preference is for Regina chains.