Topic: 18/48 sprockets not sure what chain to buy

[Jake.muller]

I have done quite a bit of research but I am not able to find anything to confirm that a 530 chain will fit my 1977 cb750 with 18 in the front and 48 in the rear. I found a few forums that seem like it will fit but I would just like to confirm before I buy.

[Marks78]

This is what I got for my '78 CB750K.  Shorten the chain to the length that fits. The stock 630 chain uses 88 links but the 530 will use more, how many depends on the sprockets you use.
If your current sprockets are for a 630 chain then they won't work with the 530 chain. Best of luck!

https://www.ebay.com/itm/SunStar-530-RDG-O-Ring-Chain-17-48-T-Sprocket-Kit-43-0070-for-Honda-/322205539624?hash=item4b04f25d28

[flybox1]

110link 630 chain, and cut off extra links for your desired length.

[Jake.muller]

I had thought the 530 chain was the stock option with the 18/48 sprockets. Is the 630 what comes with the bike? What is the difference between the 530 and 630 chain?

[DHuffman]

I had thought the 530 chain was the stock option with the 18/48 sprockets. Is the 630 what comes with the bike? What is the difference between the 530 and 630 chain?

I know the F models had a 630 chain, so I'm assuming the Ks did as well. The first number in the chain (i.e. 5 in 530) refers to the pitch - or link to link distance. 530 is 5/8", 630 is 6/8" (3/4"), etc. The rest of the number (i.e. 30 in 530) refers to the width of the rollers inside the side plates. 30 is 3/8" width.

On my '77 F I switched to 530 (I dont really see a point in doing 520 unless you're concerned with weight reduction) and put a 17T offset sprocket from Cognito Moto on the front and a Vortex 43T on the back. If you decide to do an offset for whatever reason, make sure to pay attention to chain clearance of the motor housing near the front sprocket - I had to try a couple chains before I found one that would clear.

[Marks78]

Yep, the K models also came stock with the 630 chain.

[Jake.muller]

I had thought the 530 chain was the stock option with the 18/48 sprockets. Is the 630 what comes with the bike? What is the difference between the 530 and 630 chain?

I know the F models had a 630 chain, so I'm assuming the Ks did as well. The first number in the chain (i.e. 5 in 530) refers to the pitch - or link to link distance. 530 is 5/8", 630 is 6/8" (3/4"), etc. The rest of the number (i.e. 30 in 530) refers to the width of the rollers inside the side plates. 30 is 3/8" width.

On my '77 F I switched to 530 (I dont really see a point in doing 520 unless you're concerned with weight reduction) and put a 17T offset sprocket from Cognito Moto on the front and a Vortex 43T on the back. If you decide to do an offset for whatever reason, make sure to pay attention to chain clearance of the motor housing near the front sprocket - I had to try a couple chains before I found one that would clear.

That now makes a lot more sense. I bought a 525 and it did not fit. The length in between the chain links did not make that of the distance between the teeth on the sprocket.