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-   -   What sprocket sizes are stock on 990R (http://www.advrider.com/forums/showthread.php?t=899860)

alongat 06-30-2013 06:11 AM

What sprocket sizes are stock on 990R
 
So I can tell by the part number that my bike came with a 16tooth front sprocket but when I look at the rear, I can't tell though I think I can almost see a "42" or"43" stamped on it. I've recently gone with the 19/17 wheel setup on my 2012 990 adventure R and obviously the geari g ratio has changed. Wile I appreciate the new found acceleration and wheeliness, I don't want to be spinning that high on highway crushing / longer runs and I was happy with the original gear ratio. To get it back to stock, I need to either reduce the rear sprocket tooth count by three or add one tooth up front but when I look at the front area, I'm not convinced that there is actually enough room for a 17 tooth sprocket given the chain,s current proximity to the slave cylinder, etc. can anyone confirm if there is in fact room to run a 17 tooth up front? It seems like the better choice compared to reducing the rear by three teeth. Bigger sprocket up front is easier on the chain and reduces drivetrain losses, right?

Thanks in advance

alongat 06-30-2013 06:13 AM

And I just counted the teeth on the back sprocket - 42 so my bike has a 16/42 setup.

laramie LC4 06-30-2013 07:06 AM

yup 16/42 is the stock ratio on the 990R. divide 42/16 = 2.625, 45/17 = 2.647, 45/15 = 3.0 and so on....the lower the number, the taller your gearing.

i have no idea how your smaller tires will affect/change the ratio but i'm sure a little google work will get you a formula.

laters,

laramie :beer

alongat 06-30-2013 07:25 AM

I've done the calculations - based on my new wheel/tire circumference, going with one tooth up in the front or three teeth down in the rear will get me extremely close to what I had before changing the wheels. I'm wondering if people are running 17 tooth front sprockets from a clearance standpoint.

rider911 06-30-2013 07:36 AM

All 990s used to come std with a 17T front sprocket. Im not sure what year they started putting 16T on.
I use 17/45 on my bike most of the time but if im doing a softer ride with some bemmers then I will use 17/42 to give it a few more legs.

alongat 06-30-2013 01:26 PM

Ok, so it sounds like a 17 does fit. Now, does anyone have an opinion on whether or not to get a standard front sprocket or the KTM dampened sprocket like the one on it now? Can anyone actually feel any difference?

spafxer 07-01-2013 10:02 AM

The 17 dampened sprocket fits for me, and I do not notice any noise difference from the un dampened sprocket.

I assume when they do noise tests with machines, the dampening must make a difference ! (of course they use stock mufflers too. Long gone for most of us!)

Trail bandit 07-01-2013 01:20 PM

Quote:

Originally Posted by rider911 (Post 21759969)
All 990s used to come std with a 17T front sprocket. Im not sure what year they started putting 16T on.
I use 17/45 on my bike most of the time but if im doing a softer ride with some bemmers then I will use 17/42 to give it a few more legs.

I like the legs on the 17/42. Note. It doesn't look like its going to fit. You've got to get it sitting just right then it just slips in place with no room to spare.

Rekluse clutch gives the best of both worlds. You can run good highway gearing and crawl speeds with no clutch use.

I'm up to 160 miles on a tank of gas. 1/3rd dirt trails and balance highway. Very interested when I go to fill up what the mpg is going to be. Low fuel just came on.

woodchuckexc 07-01-2013 01:54 PM

Why an "R" if you plan on riding street? It seems like such a waste to take a thorough bred offload beast and mount street wheels.

FakeName 07-01-2013 02:48 PM

Quote:

Originally Posted by alongat (Post 21761302)
Ok, so it sounds like a 17 does fit. Now, does anyone have an opinion on whether or not to get a standard front sprocket or the KTM dampened sprocket like the one on it now? Can anyone actually feel any difference?

It's always been my understanding (I could be wrong, and often am) the dampened sprocket is meant to be gentler to the power train.

spafxer 07-01-2013 03:52 PM

Quote:

Originally Posted by FakeName (Post 21767004)
It's always been my understanding the rear sprocket "cush drive" is meant to be gentler to the power train.



There, you are not wrong ! :freaky



:lol3

MortimerSickle 07-01-2013 08:35 PM

Quote:

Originally Posted by FakeName (Post 21767004)
It's always been my understanding (I could be wrong, and often am) the dampened sprocket is meant to be gentler to the power train.

spafxer has it right: Rear cush yes, but the rubber on the front sprocket dampens only noise. It does nothing to cushion the drive.

keener 07-01-2013 11:17 PM

Quote:

Originally Posted by MortimerSickle (Post 21769834)
spafxer has it right: Rear cush yes, but the rubber on the front sprocket dampens only noise. It does nothing to cushion the drive.

And it dampens a lot of noise, the front sprocket that is... I tested this riding with engine off in natural. I compared two sprockets.

keener 07-01-2013 11:21 PM

Surprised no one has mentioned this here yet:

http://www.gearingcommander.com/

MortimerSickle 07-02-2013 06:51 AM

Quote:

Originally Posted by keener (Post 21770492)
And it dampens a lot of noise, the front sprocket that is... I tested this riding with engine off in natural. I compared two sprockets.

I guess I'm deafer than I had thought. :D


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