Dual Sprocket How-To?
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  1. #1
    Junior Member TewDub's Avatar
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    Dual Sprocket How-To?

    I have two Tee-Dubs that I picked up several months ago, both 2003s in near perfect shape, and each had only 250 miles on them. I bought two so I could take another person with me and teach my wife and 13 year-old boy how to ride. I decided to go to the dark side by putting a 52 tooth rear sprocket on one and a 55 tooth on the other (for those learning). Since I do some in-town street riding, I'd like to try doing a dual sprocket using my TW with the 52 tooth and add a 48 tooth. It seems like a simple job, but just wanted to get some tips from the experts in this forum, such as what to use for proper spacing for the chain, whether a recessed sprocket is required, safety concerns, and whether or not I need to get new hardware (nuts & bolts). I've seen several posts on dual sprockets with pics, but haven't seen a step-by-step guide. Any help is appreciated. Thanks!
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    Senior Member Fred's Avatar
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    Review "Similar Threads” listed at bottom of this web page to find all your answers.
    Last edited by Fred; 08-27-2017 at 11:42 AM.
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    Senior Member admiral's Avatar
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    Quote Originally Posted by TewDub View Post
    I have two Tee-Dubs that I picked up several months ago, both 2003s in near perfect shape, and each had only 250 miles on them. I bought two so I could take another person with me and teach my wife and 13 year-old boy how to ride. I decided to go to the dark side by putting a 52 tooth rear sprocket on one and a 55 tooth on the other (for those learning). Since I do some in-town street riding, I'd like to try doing a dual sprocket using my TW with the 52 tooth and add a 48 tooth. It seems like a simple job, but just wanted to get some tips from the experts in this forum, such as what to use for proper spacing for the chain, whether a recessed sprocket is required, safety concerns, and whether or not I need to get new hardware (nuts & bolts). I've seen several posts on dual sprockets with pics, but haven't seen a step-by-step guide. Any help is appreciated. Thanks!


    When I did mine...


    There will be some trial and error no matter what so expect that.

    I used 1 non-recessed and 1 recessed sprocket. I placed the recessed sprocket went over the hub inward if you will. The non-recessed sprocket was my outboard sprocket.

    I used nuts as spacers between the sprockets. As far as bolts go, I just went to the hardware store and bought some long enough to go all the way through with a washer & lock washer +nut. You'll see I changed the direction of the bolts in the pictures below with the nut on the inside. This was for clearance with the swingarm and chain guard.

    At first, I used an o-ring chain but my clearance between sprockets wasn't enough and the chain rubbed on the larger sprocket when mounted on the smaller sprocket. I changed to a standard chain (non-o-ring).

    My outer sprocket rubbed the chain guard so I removed it and bent in the guard mount. Figured I could always bend the and remount the chain guard if needed.

    Pictures below will explain some more things.


    In the end, I stopped using a dual sprocket for a few different reasons.

    1. I only ever changed to a different sprocket one (1) time while out on a ride from 50T to 55T.

    2. Pre-mature sprocket wear. Both rear sprockets will be off-center of the front sprocket slightly. I notice a little more wear from the front sprocket. (I never checked or don't remember the chain itself having any pre-mature wear but it would be wise to watch it).

    3. I found that I liked the 14/55T sprocket for my overall compromise. I could ride out on the highway at 55-60 with the 55T and it was much better on the trails than 14/50.

    I had no safety concerns other than the sprocket wear I mentioned above.











    Started with an o-ring chain but changed it due to rubbing. Picture is mostly for reference.

    Last edited by admiral; 08-28-2017 at 12:46 PM.
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    Senior Member CS1983's Avatar
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    Solid post, Admiral.

    Question: How quick is it to switch chain to another sprocket? I'm assuming one has to loosen back wheel and adjust chain tension?
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    Senior Member admiral's Avatar
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    Quote Originally Posted by CS1983 View Post
    Solid post, Admiral.

    Question: How quick is it to switch chain to another sprocket? I'm assuming one has to loosen back wheel and adjust chain tension?
    Took me about 5 minutes and yes loosen and adjust-retighten. I used the tools from the onboard tool kit (and nearby rock) to move the adjusters. I was using the 50T and we went down a very steep road to a river. I was worried that I would stall on our way out in a couple really steep rocky sections which is why I changed it.
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    Senior Member CS1983's Avatar
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    In your estimation, would this setup work w/ stock and a 60T for the Duro?

    I would imagine I'd have to remove/add chain links at that point?

    How do you feel a 55t would work for Duro vs 60?
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    Senior Member admiral's Avatar
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    Forgot to include this in my first post. This is what the sprocket looked like when I replaced it. All of my sprockets have had similar "wear marks" as seen but this one the marks from the chain went deeper. I believe this was because of the offset rear sprockets and the chain not lining up exactly.

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    Senior Member CS1983's Avatar
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    Quote Originally Posted by admiral View Post
    Took me about 5 minutes and yes loosen and adjust-retighten. I used the tools from the onboard tool kit (and nearby rock) to move the adjusters. I was using the 50T and we went down a very steep road to a river. I was worried that I would stall on our way out in a couple really steep rocky sections which is why I changed it.
    Do you have a small torque wrench? Just tighten really tight and then torque to spec later?
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    Senior Member admiral's Avatar
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    No, I don't torque the axle nut. Just cinch it tight.
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    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

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    Junior Member TewDub's Avatar
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    Admiral, your post was the most helpful of any I have seen! Thank you so much for taking the time to go through all the detail. I am thinking about doing a 14T front with 47T and 52T dual rear on one of my Tee dubs. 52T is awesome, but have been doing a lot of road riding and wouldn't mind lower RPMs at 50mph. I am leaving the 14T/55T on my other one. Just curious how many miles you had on your front sprocket with that wear on it.

    Thanks!

    -TewDub
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