Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.
Joined: Jan 29, 2010 Posts: 31 Location: Dearborn, Michigan
Posted: Wed Jan 04, 2012 6:27 pm Post subject: CH70H drive chain lenght and sprocket size
I recently bought a new drive chain for my 1970 ct70H but it seems to be to short. The old rusty chain that was on there is a 420M 46 link and the new one is a 420M 44 link. The sprocket has 45 teeth on it. Does anyone know what the correct chain and sprocket size for this bike is?
Joined: Oct 30, 2009 Posts: 612 Location: Parker, CO
Posted: Thu Jan 05, 2012 10:36 am Post subject:
I went out to the shop to count the links and teeth on my '71 CT70-H model. It has a 45 tooth rear sprocket. I believe it is all original but have been fooled before. I didn't check the front sprocket. The chain has 46 outer links (92 holes) not sure how you like to count a chain. I think it is a 420 chain though not sure. It's possible the the auto clutch model used different size sprockets, as I've seen different tooth counts, as low as 35, on some later models according to the microfiche parts numbers. Also 14 tooth front sprocket according to bike bandit.
Last edited by Rizingson on Thu Jan 05, 2012 10:59 am; edited 1 time in total
Joined: Feb 15, 2007 Posts: 1357 Location: LaPorte, Indiana, USA
Posted: Thu Jan 05, 2012 10:47 am Post subject:
Just buy a chain that's too long and cut it to length....... _________________ Bill Lane - CB200-CM200-CB450-C70M-CL350
"When your only tool is a hammer,
everything starts to look like a nail."
Joined: Jan 29, 2010 Posts: 31 Location: Dearborn, Michigan
Posted: Thu Jan 05, 2012 11:37 am Post subject:
Rizingson wrote:
I went out to the shop to count the links and teeth on my '71 CT70-H model. It has a 45 tooth rear sprocket. I believe it is all original but have been fooled before. I didn't check the front sprocket. The chain has 46 outer links (92 holes) not sure how you like to count a chain. I think it is a 420 chain though not sure. It's possible the the auto clutch model used different size sprockets, as I've seen different tooth counts, as low as 35, on some later models according to the microfiche parts numbers. Also 14 tooth front sprocket according to bike bandit.
Thanks. Yeah i think i figured it out now. First, I counted the chain wrong. It is a 86 link chain. Secondly, the chain that I ordered from bike bandit is for the CT70 not CT70H. The bike is a 1970 but bike bandit doesn't have the "H" for that year. My rear sprocket is the 45 tooth, so I know that is correct. I will return the chain and get the correct one. Thank you for the reply.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum
