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Thread: Which Bigger Sprocket

  1. #1
    Junior Member kingtw's Avatar
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    Question Which Bigger Sprocket

    Hello TW nation.

    I mainly use my TW200 for single track trail riding. Many of the trails have steep inclines and I often loose RPMs really fast and will die before getting to the top. I just have a stock sprocket on right now and I am pretty sure I need to go with a bigger one. I am not a small guy at 6'4" and 205lbs, but I would like more low end power to get up some of the steep hills. Is going to a 52 tooth sprocket big enough or should I jump to a 55 tooth? Can you guys give me some advise on what size and brand sprocket to go with?

    I found this one on Amazon, has anyone used this one?
    http://www.amazon.com/JT-Sprockets-J...ype=motorcycle

    Thanks for the help.

  2. #2
    Super Moderator littletommy's Avatar
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    Quote Originally Posted by kingtw View Post
    Hello TW nation.

    I mainly use my TW200 for single track trail riding. Many of the trails have steep inclines and I often loose RPMs really fast and will die before getting to the top. I just have a stock sprocket on right now and I am pretty sure I need to go with a bigger one. I am not a small guy at 6'4" and 205lbs, but I would like more low end power to get up some of the steep hills. Is going to a 52 tooth sprocket big enough or should I jump to a 55 tooth? Can you guys give me some advise on what size and brand sprocket to go with?

    I found this one on Amazon, has anyone used this one?
    http://www.amazon.com/JT-Sprockets-J...ype=motorcycle

    Thanks for the help.
    Welcome to the forum!! Where are you from?
    Here is a sprocket calculator that might help you determine what might work best.
    Sprocket Calculator - the easy motorcycle sprocket and chain calculator

    Personally, I think the 55 would suit you better.

    A 52 would give you 3.8% difference, a 55 would be a 9.1% difference.
    Last edited by littletommy; 08-28-2015 at 05:36 PM.
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  3. #3
    rbm
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    Senior Member rbm's Avatar
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    Hello and welcome! What LT said^^.
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  5. #4
    Super Moderator goldenhtr's Avatar
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    I'm thinking 55
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  6. #5
    Senior Member old w/??'s Avatar
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    Welcome kingtw;

    When you say "mainly"; we need to know the other end also. I would venture to say that most on here that want lower off-road gearing go with a 55 tooth rear. I bought one to play with and then decided to get a 65 tooth to try (harder to find and more expensive).

    I love the 65 tooth off-road. At Fred's last group ride; as we came down a steep incline from Crater Lake south of Tahoe - me not using brakes in 1st gear, I was falling behind those who were "riding" their brakes constantly while in 1st. I would have to shift up to 2nd to close the gap.

    To be in the peak torque and HP range with stock gearing - I think you need to be doing around 16 mph in 1st gear; and faster in 2nd etc. About wound out in 1st and way to fast in each gear for our suspension on rough trail conditions. The 65 tooth brings you closer to the torque/power band at lower speeds and should keep you from stalling.

    However; I really dislike riding around city streets at more than 35 mph with that sprocket.

    So it will depend on if you get on the freeway some or just 55 mph roads or if only 35 mph roads and hard trails. 35 mph street and hard trails gets my vote for 65 tooth. Otherwise probably no less than 55 tooth if you want lower gearing. -J-

  7. #6
    Senior Member Fred's Avatar
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    I just put on your chosen sprocket, JT Sprockets JTR1842.55 55T Steel Rear Sprocket. It is my second one, for some reason it arrived silver finish not the black I thought I ordered, oh well. Anyways it is a good choice for your stated intended use. Sixty Five teeth in the rear makes for a real off road crawler, I have ridden two TWs so equipped and while very versatile off road I imagine it kills a lot of the dual sport nature of the TW.
    Personally I have a 13 tooth front sprocket but a larger diameter ATV tire in the rear so my overall gearing approximates what a 14/60 with stock tire would deliver.
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  8. #7
    Banned ZDR1's Avatar
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    So if you went to a 55 is the stock chain long enough ?

  9. #8
    Senior Member TW-Brian's Avatar
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    Hi King, welcome to the forum!

    I have used sprockets from JT and Sprocket Specialists. Both are good quality sprockets. Some sizes are available in both steel and aluminum. The larger sizes seem to only be available in aluminum.

    I have run the following sizes of rear sprockets with the stock 14T front and a Duro 26x8x14 ATV tire. Here are some of my impressions:

    47T - An improvement for highway use. Doesn't noticeably increase top speed but reduces rpms so the ride is not so buzzy. Not good (i.e., dangerous) for steep trails.

    50T (stock size) - Good combination for mix of street and moderate fire road type trails.

    55T - Nice improvement for steeper off-road riding while still allowing short highway hops at 55-60mph.

    65T - I absolutely love this for off road. Makes steep, gnarly downhills an actual pleasure to ride. Limits on-road top speed to about 50. If you don't care about going over 40-45mph on-road, I would even consider a 70T which is the largest that I seen anyone use.

    I run the dual rear sprocket setup. Here are a couple of pics showing two of the combinations that I have used:

    Here is a 47/55 combo,

    100_3381.JPG

    Here is a 55/65 combo,

    100_5020.JPG

  10. #9
    Senior Member TW-Brian's Avatar
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    Quote Originally Posted by zdiver1 View Post
    So if you went to a 55 is the stock chain long enough ?
    Sorry Paul, but I don't believe the stock chain will be long enough.

    I switched over to an o-ring chain when I got my 55T sprocket.
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  11. #10
    Senior Member elime's Avatar
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    Give the stock chain a try. I was using the same chain for 50 and 55 teeth.
    Long live the internal combustion engine!

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