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Title: new chain and sprockets! Post by: vw151 on December 12, 2009, 08:45:59 PM My old chain had stretched so much I could no longer tighten it. I decided to go to a 520 DID ERV3 chain and 520 sprockets.
got a drilled Afam 15 tooth front and 43 tooth ferraci sprocket to go on the ferraci quick change carrier. I was not going to go with a quick change but the carrier was on ebay used for $40. They are usually $200. stock gearing is 15/41, I was at 14/41, now I'm going to 15/43. 14/41 was just a tad short so this might be just right. We'll see anyway. Clean eccentric! (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0685.jpg) (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0686.jpg) (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0692.jpg) (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0694.jpg) (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0696.jpg) (http://i741.photobucket.com/albums/xx52/josephhansen/new%20chain/IMG_0697.jpg) Title: Re: new chain and sprockets! Post by: TAftonomos on December 13, 2009, 04:46:51 PM Just a question for you, but where is your eccentric adjusted once the chain is tensioned?
Title: Re: new chain and sprockets! Post by: vw151 on December 14, 2009, 03:12:14 PM Forward middlish. Not as far forwards as it is in the picture where nothing is installed. I didn't have it all the way forward but I left room for adjustment as the chain stretches over it's life. I'm running 15/43 gearing and 106 links and it's a brand new chain if that tells you anything, I could have went to 105 links but it would have been all the way forward and 107 links wouldn't have left a lot of room for future adjustment.
Is there a best practice? Title: Re: new chain and sprockets! Post by: TAftonomos on December 14, 2009, 05:25:51 PM Well, I was asking as I was in a situation with similar gearing.
As I've been taught, the eccentric should be between 6 and 3 oclock when looking at the bike from the left. Remember changing the eccentric screws with ride height and trail, but unless you are really hustling the bike around, you probably won't notice (unless it's a huge change) Title: Re: new chain and sprockets! Post by: LA on December 15, 2009, 07:45:46 AM I run a 14/43 and love it.
I found a 15/43 didn't let me use 6th gear at normal "legal" speeds of say 60 mph. With a 14/43 you get something like 60 - 62 mph at 4000 rpm in 6th, right where the torque is getting good. Roll ons in 6th from that point are great. I know the air cooled engines are a little different torque wise, but they do all use the same primary gearing. LA Title: Re: new chain and sprockets! Post by: vw151 on December 15, 2009, 11:01:54 AM Well, I was asking as I was in a situation with similar gearing. As I've been taught, the eccentric should be between 6 and 3 oclock when looking at the bike from the left. Remember changing the eccentric screws with ride height and trail, but unless you are really hustling the bike around, you probably won't notice (unless it's a huge change) It's probably a little forward of 6 oclock but as the chain initially wears in I think it'll fall into about 6. I am going to have the bike up at Ducati Indy this winter and will likely re-evaluate the ride height and such. Matt has done all of the suspension tuning for me on the bike. I'm sure it will see the track again sometime in the future and I do like to ride it pretty fast so I try to keep things set up right. I want to source a relatively inexpensive fully adjustable rear shock for it as the sachs that comes on it is a little lacking. |