Front and Rear Sprockets - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 57 Old 08-18-2013, 12:06 AM Thread Starter
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Front and Rear Sprockets

Hello All,
I was wondering about a sprocket change. someone mentioned to me that i would like the performance of my bike if i went one size smaller in the front, 3 sizes bigger in the rear. what does this mean and what all does it take to have everything working properly?

OK i have been reading and there is alot said about this subject. my concern is if i go on the highway i need to be able to do 80 at a rpm that isnt going to be to close to redline. i also want to have a quick reaction time in the city streets when people drive like im invisible. I do well with the back as it is stock but if there is a better way to both worlds im looing for then i want to do this. im replacing the exhaust and airfilter and would like to know where to go with the sprocket if anywhere. im not looking for a race bike im just looking for better outcome to what i have now if possible. alot of mixed emotions on this subjuect but thhis is why i came to join the forum. oh and i only way 140lbs so the bike doesnt even know someones on it lol

Last edited by Bobby; 08-18-2013 at 01:35 AM.
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post #2 of 57 Old 08-18-2013, 12:56 AM
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What do you expect, when you change the sprockets. Faster acceleration, lower engine rpm's at highway speeds, increased mpg, etc, etc?????

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post #3 of 57 Old 08-18-2013, 01:00 AM Thread Starter
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According to the calculator if i did this setup my over all top speed will drop. but your saying my accel will go up. So you either want over all top speed or quick accel to a lower speed max?
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post #4 of 57 Old 08-18-2013, 01:25 AM
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Just put a 13t on the front.

Everything will be more efficient, bike wont bog down, and you'll see a higher top speed anyway as the 250 cant pull stock gearing anywhere but with a 40kg midget aboard, down a very steep hill with the planets aligned and holding your tongue just right.



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post #5 of 57 Old 08-18-2013, 01:35 PM
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Quote:
Originally Posted by Aufitt View Post
Just put a 13t on the front.

Everything will be more efficient, bike wont bog down, and you'll see a higher top speed anyway as the 250 cant pull stock gearing anywhere but with a 40kg midget aboard, down a very steep hill with the planets aligned and holding your tongue just right.
Aufitt, I've always wondered how your track bike is set up, and what course you're racing in. Did you ever a post or thread on that?

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post #6 of 57 Old 08-18-2013, 01:43 PM
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Just put a 13t on the front.
^+1. Puts peak horsepower at 80mph. Going down a tooth in the front is a common first move. It you're still wanting more, you can add 2 teeth in the rear without needing another chain and still won't redline until 93mph.

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post #7 of 57 Old 08-18-2013, 09:06 PM Thread Starter
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im replacing the airfilter and exhaust, would i even need to change any sprockets?
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post #8 of 57 Old 08-18-2013, 11:09 PM
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Quote:
Originally Posted by Bobby View Post
im replacing the airfilter and exhaust, would i even need to change any sprockets?
*facepalm*


If you want a quicker bike, you should of bought a quicker bike.

Air filter which is stock is fine, so if you're talking about a K&N you should look around the website and see what others think about them. Topics been made about it.

And exhaust isn't going to exactly give you more power, it may give you a tiny bit of power but nothing worth the $$ it cost. You need to go full out with fuel controller, etc.


So, I don't know what you goal in mind is, so its kind of funny when you say you're changing your air filter and exhaust and would you need sprockets. Its a 250, why try to make it more than it is.. If you're going to put that much money into it, shoulda went bigger.
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post #9 of 57 Old 08-18-2013, 11:31 PM
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Quote:
Originally Posted by Bobby View Post
im replacing the airfilter and exhaust, would i even need to change any sprockets?
1) As others have previously suggested, install a 13T front sprocket. Forget about changing the rear sprocket... you don't want or need to gear this bike that low for street/road use. Changing to a 13T sprocket up front is the most significant single improvement you can do to this bike, and for less than $25 to boot.

2) Stick with the OEM Honda Air Filter... it works just fine.

3) If you want to go with with an aftermarket exhaust, fine... just do yourself a favor and stay away from the the $150 - $200 junk that is being peddled out there... get a quality built unit from FMF or Akropovic. Just don't expect huge power gains from an aftermarket exhaust by itself... it's not going to happen.

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post #10 of 57 Old 08-19-2013, 02:17 AM
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Quote:
Originally Posted by Bobby View Post
Hello All,
I was wondering about a sprocket change. someone mentioned to me that i would like the performance of my bike if i went one size smaller in the front, 3 sizes bigger in the rear. what does this mean and what all does it take to have everything working properly?
I put a 13T on front, quicker acceleration and can still can maintain HWY speeds with ease @ 6500-7000RPM.

It's a whole new beast, and still get ~340km/tank.

Quote:
Originally Posted by MotoMike View Post
3) If you want to go with with an aftermarket exhaust, fine... just do yourself a favor and stay away from the the $150 - $200 junk that is being peddled out there... get a quality built unit from FMF or Akropovic. Just don't expect huge power gains from an aftermarket exhaust by itself... it's not going to happen.
There are Musarri Slip-On's that are re-badged Screaming Demon pipes for $199 I'm looking at. So you're saying they're no good?

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Last edited by OzHonda; 08-19-2013 at 02:40 AM.
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