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Old July 16th, 2016, 09:52 PM   #1
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939's Rear Sprocket and Chain on 821?

Anyone here know if the rear sprocket of the 939 fits onto the 821 bikes? Reason being the 939 has a 43 tooth and the 821 is a 45 tooth. Thanks.
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Old July 17th, 2016, 01:23 AM   #2
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Anyone here know if the rear sprocket of the 939 fits onto the 821 bikes? Reason being the 939 has a 43 tooth and the 821 is a 45 tooth. Thanks.
why would you want to transmit longer ?
all people who change do transmit shorter to get revs up.

to transmit shorter you change front sprocket to a smaller one or back one to a larger one.


i would let it default, best compromise imho
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Old July 17th, 2016, 06:18 AM   #3
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Which raises the question about 939 gearing. 1st on the 821 is pretty high, did they change the gear ratios on the 939?
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Old July 17th, 2016, 09:29 AM   #4
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I have yet to see a bigger front sprocket offered for 821/939, the only option I have found to go taller so far is the 43 tooth back sprocket. Thats just what i have found searching the internet, could be wrong.
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Old July 17th, 2016, 06:24 PM   #5
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Huh, I had no idea they changed the gearing. I don't see why it wouldn't fit though. Should be the same 525 chain.

Anyone else interested in fitting a 530 chain & sprockets? I've been toying with the idea, when it comes time to swap mine out. I'd be willing to bet some of the Multistrada sprockets fit our bikes.
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Old July 17th, 2016, 09:24 PM   #6
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What would be the advantage in going to 530? Would've thought that would cause power loss through the drivetrain?
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Old July 18th, 2016, 05:44 AM   #7
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Originally Posted by HyperPH View Post
Anyone here know if the rear sprocket of the 939 fits onto the 821 bikes? Reason being the 939 has a 43 tooth and the 821 is a 45 tooth. Thanks.
It would fit, the new 939 uses: 16014211A REAR SPROCKET FLANGE, the same from the 821.

I use the JTA750B adapter, to save money on future rear sprocket changes (to use it with JTR752 sprocket), also available in 45, but I've mounted a 14/42 (due to the supplier stock).

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Which raises the question about 939 gearing. 1st on the 821 is pretty high, did they change the gear ratios on the 939?
Gearbox ratio is the same, they only changed the rear sprocket for a 43-tooth in the 939 (45 in the 821).

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What would be the advantage in going to 530? Would've thought that would cause power loss through the drivetrain?
More friction, less acceleration and -in theory- it will last longer. It's used on >1000cc street bikes for example, you can compare the different specs in D.I.D. Racing Chains & DirtStar® Rims (Tensile strenght...).
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Old July 18th, 2016, 06:54 AM   #8
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Gearbox ratio is the same, they only changed the rear sprocket for a 43-tooth in the 939 (45 in the 821).


To me that seems a little daft. First gear is already tall - maybe they're going for higher top speed, but I don't see the point.
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Old July 18th, 2016, 09:29 PM   #9
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939 has more torque so the tall 1st gearing would handle a 43 rear better than the 821.
Fuel consumption would also be down, maybe it was a way of passing euro 4??
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Old January 7th, 2017, 07:40 PM   #10
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939 has more torque so the tall 1st gearing would handle a 43 rear better than the 821.
Fuel consumption would also be down, maybe it was a way of passing euro 4??
I have a 43T on my 821. Much nicer on the highway and 4th gear seems more useful too. It's just a little less of a wheelie launcher now.

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