School Me On Sprokets - Kawasaki KLR 650 Forum
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post #1 of 9 Old 05-19-2012, 02:50 PM Thread Starter
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School Me On Sprokets

95% of my riding is up and down I-5 at 70 to 80 mph (I know there are probably better bike choices, but as a new rider I am very comfortable on the KLR and plan to move up in 6 months or so).

I've decided to go with a 16 on the front and drop to a 40 on the rear. Thoughts...?

Also, I cant seem to find less than a 42 tooth in steel... only aluminum. Whats the difference? Is there a significantly reduced life span for the alum? My initial instinct is to go for a steel one for maximum longevity, but I have zero experience here. If steel is the choice, suggestions for where to get are appreciated!

James

Edit: just to let you know, I have had the bike one month today and have well over 2,000 miles on it. I am going to be riding 2-3k miles per month.

Last edited by jameslemoore; 05-19-2012 at 02:54 PM.
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post #2 of 9 Old 05-19-2012, 05:09 PM
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Why change the rear sprocket? My suggestion for life and flexibility, stay with the std. 43 T rear. That allows you to change the engine countershaft sprocket with the standard length chain to 14, 15, 16 without any issues. My superslab choice is a 17 tooth countershaft sprocket with Eagle Mike's 17 T sprocket, spacer washer and prevailing torque nut. A small amount of cutting the plastic cover is required to clear the chain with the 17T, but easy to do. I ride on/off road with a 17, and while not ideal off road, not a problem. (more clutch slipping but the KLR clutch is robust and you change oil every 2k miles, right?)
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post #3 of 9 Old 05-19-2012, 05:09 PM
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I run all highway as well, 70-85mph, I run a 16 tooth front sprocket and stock rear, I changed to Shinko SR712 tires with rear size 130/90-17. At 80 mph I'm running 5200 RPM with no vibration and I'm very happy with it, at 55 I'm at 3000 RPM which is perfect. My opinion is save money on rear sprocket and buy road tires and the 16 tooth front.


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post #4 of 9 Old 05-20-2012, 01:24 AM
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I was looking into the aluminum vs steel thing and I found this.

http://www.supersproxusa.com/

This is interesting. The interior of the rear sprocket is made of aluminum, and the teeth/outside is made of steel.

They claim
Quote:
Supersprox-stealth will last 3 times longer than an aluminum sprocket and is between 10-50 % lighter than a steel sprocket (Depending on model and tooth number).
They don't support the klr, but they do the klx. I'm not sure I understand their pricing, but it seems you can get a Chain, supersprox rear sprocket, Front sprocket, a t-shirt, and master link hardware for 220 for a klx. I wasn't sure if it was a good deal, but the self promoting t-shirt puts it over the top for me.

Based on the internet reviews I've read, the aluminum sprocket's weight isn't that much of an advantage. Still, I think the supersprox is kind of innovative.
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post #5 of 9 Old 05-20-2012, 03:27 AM
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hey yeah had 41tooth on rear before = cant find another one...

aluminum is for race =less weight ,change every race!!

steal is for klr,will take more abuse an is just stronger.... so can carry extra weight,ride twice as long and far...
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post #6 of 9 Old 05-20-2012, 10:34 AM
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I agree with the others just change the front. Go with a 16 first and see if that's enough for you because the lower the gear ratio the less acelleration you'll have. A 16 will nock off about 400 RPM at 60-65 mph.

BTW do you know that the speedo is about 10% optomistic on a Gen 2? I didn't when I got my 08. I would be cruising at 65 indicated and have cars backed up behind me, duh I was really doing less than 60. Found out after I got a GPS!

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #7 of 9 Old 05-21-2012, 09:44 PM Thread Starter
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Thanks for the input! Well I put on the 16t front and it seems much better on the highway. I'll leave it on for a bit and try the 17t in the near future. I still might order a 42t rear just to experiment. No change in fuel economy (Im getting 42-48)... I suspect that has more to do with drag and aerodynamics at the speeds Im traveling more than gear ratios.

Stub... Yea, I am on the 2k oil change plan!

Tim... I have been considering the road tires, especially considering the type of riding I do and how fast the stockers are wearing. I'll check those out.

Spec... yep, I noticed my speedo was off. Weird as it sounds, my car is off by almost an identical amount, so I adapted easily. Actually, I like it showin a little faster... helps me keep the red lights outta my rear views.
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post #8 of 9 Old 05-21-2012, 09:52 PM
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Quote:
Originally Posted by steferf View Post
I was looking into the aluminum vs steel thing and I found this.

http://www.supersproxusa.com/

This is interesting. The interior of the rear sprocket is made of aluminum, and the teeth/outside is made of steel.

They claim

They don't support the klr, but they do the klx. I'm not sure I understand their pricing, but it seems you can get a Chain, supersprox rear sprocket, Front sprocket, a t-shirt, and master link hardware for 220 for a klx. I wasn't sure if it was a good deal, but the self promoting t-shirt puts it over the top for me.

Based on the internet reviews I've read, the aluminum sprocket's weight isn't that much of an advantage. Still, I think the supersprox is kind of innovative.
Actually they do support the Klr. A friend rides with them. Very good product.


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post #9 of 9 Old 05-21-2012, 09:58 PM
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Quote:
Originally Posted by Aron31 View Post
Actually they do support the Klr. A friend rides with them. Very good product.
I couldn't find the klr product on their website. I think it would be nice if they made the steel replaceable...ie. you keep the aluminum to keep prices in check.


How does your friend like them? Handling benefits?

2006 Red KLR 650

Modifications:
1)Doohickey Planned and purchased 2)Aftermarket Grips 3)Grip Heaters 4)Happy Trails Hard Luggage Rack 5)20 mm ammo cases planned soon 6)Aftermarket Exhaust 7)Thermobob 8)Happy Trails Fork Brace 9)Stainless Steel Oil Filter 10)Magnetic Drain Plug

See profile visitors post for details and planned mods.
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