Re: what sprocket do i need ( rear rim question)

Posted by Re-run on Sep 15, 2010; 1:55am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/what-sprocket-do-i-need-rear-rim-question-tp1463482p1476940.html

Well on the 77/78, the stock chain was 630 of course. the front sprocket was a 15tooth and the rear, 41 for a 2.73 ratio.
In the 530 equivalent, a 17t front and 47t rear give a 2.76, so slightly more bottom end but hard to notice.
If you did a 16/47 you get a 2.93 which would be a fair jump in bottom end pull.

the difference in 630 is apparent on the spacing between rollers. So if you have a known 530 sprocket, if the teeth fit, it is already a 530. Although it sometimes says the size on the sprockets too.

I would not worry about the chain though if it is old. Sprockets/chains are best replaced together and then if well lubed and cleaned, will last 10,000+ miles, some people can even get 20,000.