Front sprocket size and chain length
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Thread: Front sprocket size and chain length

  1. #1
    Junior Member mtnmanidaho's Avatar
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    Front sprocket size and chain length

    I have a 72 tooth sprocket coming to me from Sprocket Specialists but they were all out of the 14 tooth front. This has me thinking that maybe I should consider a 13 or 15 tooth instead and wanted to field some opinions. I'm wanting to build a climber, I wont be going more then 25 mph so top speed isnt an issue.

    Secondly could someone recommend a chain link size for me, i see alot of TW sites selling 130 link kits but dont want it to be too short for such a large rear sprocket.
    jtomelliott49 likes this.

  2. #2
    Senior Member admiral's Avatar
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    Yes, a 13 or 15 front sprockets will work. I've been using a 13T front sprocket with the various rear sprockets throughout the year (50, 55, 60). I've ordered my 13T front sprocket either from eBay or Amazon I can't remember which, listed for a TW.

    It came with a spring clip


    instead of the bolt retainer you see on the stock 14T sprocket.


    You can get a 14T from Rocky Mtn ATV/Motorcycle for $10.74 (3 in stock). If you order it today you'll probably get it tomorrow. 99% of the parts I order from them I get the next day unless I order on a Friday or Saturday.

    https://www.rockymountainatvmc.com/oem-schematic/4

    The closest I could get to how long of a chain was using this calculator which only went as high as 13/65 = 152 links. I suspect you'll need more so you'll probably have to buy two chains and cut & splice to get the links you'll want.

    Sprocket Calculator - the easy motorcycle sprocket and chain calculator

    I've heard of at least 2 forum members who've used a 70 or 72T rear sprocket but I can't find any info using the forum or google search functions.
    Last edited by admiral; 11-01-2017 at 10:46 AM.
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    Super Moderator Purple's Avatar
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    Bodi is the one you need to talk to

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  5. #4
    Senior Member Pete H's Avatar
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    72 tooth? A 50 comes stock. You must get extra traction turning left with that sprocket. A 14 front and 50 rear comes stock and I think that is way too low for my 260lbs. I switched out for a 15t and 47t option on mine. With a 72 tooth rear you must top out at about 40 mph. Yea!, I would say to go to a 13t front if you want to be in 3rd before you get to 10mph. and if you truly have a 72T rear you will need at least 142 links.
    jtomelliott49 likes this.

  6. #5
    Senior Member old w/??'s Avatar
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    I've run as high as 15-44 and as low as 14-65. As he states; he doesn't plan on doing more than 25 mph. You wouldn't be able to go where he is going; and he won't be able to keep up with you where you ride. But you each will have a great time on such a diversely set up machine. Ain't it wonderful!

  7. #6
    Senior Member Badgerflorida's Avatar
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    Quote Originally Posted by old w/?? View Post
    I've run as high as 15-44 and as low as 14-65. As he states; he doesn't plan on doing more than 25 mph. You wouldn't be able to go where he is going; and he won't be able to keep up with you where you ride. But you each will have a great time on such a diversely set up machine. Ain't it wonderful!
    Yeah - it’s amazing what these little monsters can do. You can have a tractor that will climb the side of your house one day, and a street ripper the next day with a couple of sprockets and and a handful of tools. The only thing you can’t do is run 75 on the interstate. At least not for long.
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  8. #7
    Senior Member Stufidmotard's Avatar
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    Mine will to out around 35mph with the 13/63 and it will climb just about anything I'm willing to aim it at. so a 14/72 should be in the same ballpark
    littletommy and jtomelliott49 like this.

  9. #8
    Senior Member Pete H's Avatar
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    Wow, I didn't know you could get a rear sprocket that big! The thing must be a tank. I can see the appeal for the woods. You could easily get off and walk along in the super nasty stuff.
    littletommy and jtomelliott49 like this.

  10. #9
    Senior Member TW-Brian's Avatar
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    Just so you will know what that 72 tooth rear sprocket will look like on your TW, here are a couple of pics of JMPNFSH's bike when we fitted his chain at a Wrench & Ride a couple of years ago. He was planning on riding the Rubicon Trail with this setup. I don't remember what size his smaller sprocket was, but you can see the section of chain that was added for the larger sprocket.



    Last edited by TW-Brian; 11-04-2017 at 11:12 PM.
    littletommy, admiral, Ken and 4 others like this.

  11. #10
    Senior Member Pete H's Avatar
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    Wow, I am impressed. I am a bit confused by the duel sprocket set up. I believe I see 3 master links. You can actually take out enough extra links to run either sprocket during a ride? That is pretty hard core.
    littletommy, Ken and jtomelliott49 like this.

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