--- In st2_owners@yahoogroups.com, "Christopher" <crea_13460@...> wrote:
>
> Thanks Nick that is how I have done it in that past. I Just
> thought I would ask to see if someone knew what if any
> additional chain links would be needed for each tooth increase
> of the rear sprocket. I always think it is a good idea to get
> information from others if they have done it.
The distance between pins on a chain is 5/8 of an inch. Adding one tooth to either sprocket moves the rear axle forward by one fourth of that amount or 5/32 of an inch. Removing a tooth - like when going from a 15-tooth to a 14-tooth front sprocket - moves the rear axle back by that same amount to keep the same chain tension.
Adding four teeth would move the axle forward by 5/8 inch, or the distance of one chain link. But there are links on both the top and bottom that are affected by this change. So if you add four teeth to your sprockets and two links to the chain you can leave the axle in the exact same position - minus some very small fraction.
When changing sprocket sizes, you can easily measure how much movement you have available to see if the same chain will still work. But when installing new chains, I never count links. I put the chain on, as someone has already suggested, and cut to the desired length.
My XR650L has a chain that is at the end of its adjustment length, but not worn out yet. I just acquired a second set of wheels, so I'm going to put a bigger sprocket on the back and still use that chain for the dirt tires and get a new one for the street (dual sport) tires. Hopefully it's a long time before the KTM needs a new chain.
__Scott R. Nelson, Pleasanton, CA - no longer a Ducati owner, but always a "Ducati guy"
Sunday, January 2, 2011
Re: [DucatiST] Chain Length
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