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CA77 Rear Sprocket

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Dogsbd Member
Posts: 360
Joined: Sat May 20, 2006 11:53 pm
Location: Upstate South Carolina

CA77 Rear Sprocket

Post by Dogsbd » Thu Jul 31, 2008 8:51 pm

Should the rear sprocket on a CA77 be 27 teeth or 29?

Advantages of / disadvantages of / personal experiences with each?


Rookie305 Member
Posts: 67
Joined: Tue Nov 15, 2005 12:55 pm
Location: Salt Lake City, Utah

Post by Rookie305 » Fri Aug 01, 2008 11:24 am

The rear sprocket on my CA77 has 29 teeth. I have no idea about the advantages and disadvantages between the two. Mine is still in pieces and has not been on the road yet.

Dogsbd Member
Posts: 360
Joined: Sat May 20, 2006 11:53 pm
Location: Upstate South Carolina

Post by Dogsbd » Fri Aug 01, 2008 3:19 pm

Mine is currently a 29 tooth as well and it also hasn't been on the road yet, ridden by me at least.

Mine is worn real bad and I've yet to find a good 29 tooth replacement, but I did run across a NOS 27 tooth which prompted my question.

I know 27 tooth would maybe lower my cruising revs but it would also make it tougher going up hill, I am wondering if it might be too much so.

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davomoto Member
Posts: 2508
Joined: Sat Nov 18, 2006 7:36 pm
Location: Marin County CA

Post by davomoto » Fri Aug 01, 2008 4:47 pm

Sprocket specialties sell sprockets for the CAs, and you can get any number of teeth that you want. They are 520, not 525, so you'd need to change both sprockets and chain, which is a good idea anyway, or they will do custom sprockets for just a few bucks more. here's a link.


joeweir1 Member
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Location: middletown,pa

Post by joeweir1 » Mon Aug 04, 2008 8:16 pm

What about a sprocket from a ca72/250cc if you find one?I will have to check the but I think they are 30 or 31 teeth, but would have to look at one to be sure.

apolo1100 Member
Posts: 18
Joined: Mon Apr 06, 2015 6:24 pm

Post by apolo1100 » Tue Apr 28, 2015 6:31 pm

I have a 1962 CA72, 7,000 org. miles worn out rear sprocket..
I just when and look.. it has 31 rear and 15 in the front .
hope this can help.

hotrodhendrix Member
Posts: 153
Joined: Tue Mar 19, 2013 1:23 pm
Location: Fort Worth Texas

Post by hotrodhendrix » Wed Apr 29, 2015 10:34 am

Post was 7 years ago but I am sure good info for others in the future. :)

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