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post #1 of 28 Old 11-19-2012, 10:21 PM Thread Starter
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15 tooth sprocket

Looking to change my front sprocket to a 15 tooth. I have one that is hardly used from my old klx, but that won't fit on the cbr I'm guessing? Where can I order a 15 tooth front sprocket from?


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post #2 of 28 Old 11-20-2012, 01:30 AM
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15T Front sprockets available

Front Sprocket for CBR250R 2011-12

Longer gearing available?

Longer gearing available?

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post #3 of 28 Old 11-20-2012, 09:42 AM
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Quote:
Originally Posted by Minifur View Post
Looking to change my front sprocket to a 15 tooth. I have one that is hardly used from my old klx, but that won't fit on the cbr I'm guessing? Where can I order a 15 tooth front sprocket from?
So you're looking to re-gear a slow bike, which is already geared too tall from the factory, even taller?

IMO, 13T front sprocket is the way to go for this bike. Improved acceleration is like night and day over the stock 14T sprocket.
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post #4 of 28 Old 11-20-2012, 10:03 AM Thread Starter
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Quote:
Originally Posted by MotoMike View Post
So you're looking to re-gear a slow bike, which is already geared too tall from the factory, even taller?

IMO, 13T front sprocket is the way to go for this bike. Improved acceleration is like night and day over the stock 14T sprocket.
Well I have experienced highway riding on a CBR125. I know what it feels like to not be able to pull 6th and even 5th gear up a hill. Have been able to pull 6th gear up everything on the highway so far (skin and bones lol). So I figure I could get away one more tooth on the front. I tried both a 13 tooth and a 15 tooth on my klx and I liked the 15 on that bike.


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post #5 of 28 Old 11-20-2012, 10:08 AM Thread Starter
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LOL, what will I make next, a CBR500 thread? Guess fake bikers like myself just don't understand the search function.


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post #6 of 28 Old 11-20-2012, 05:39 PM
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Originally Posted by MotoMike View Post
IMO, 13T front sprocket is the way to go for this bike. Improved acceleration is like night and day over the stock 14T sprocket.
It's a 250 four stroke single, who gives a **** about acceleration?

+1 is awesome for reduced buzzing on the highway. +1/-2 if you don't ride in the mountains.

Longer gearing makes the bike way more easy going in town and on the highway, and makes first way less annoying. Considering the huge number of threads related to gearing the bike up I know I'm not alone in thinking it's actually geared too short, not too long...

Last edited by sniper1rfa; 11-20-2012 at 05:41 PM.
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post #7 of 28 Old 11-20-2012, 06:04 PM
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Quote:
Originally Posted by MotoMike View Post
IMO, 13T front sprocket is the way to go for this bike. Improved acceleration is like night and day over the stock 14T sprocket.
IMHO smaller sprocket doesnt improve acceleration, just the speedometer digits are more nice for you (they are +7% fake after sprocket change). If you are in Europe, where OEM speedo is about +9%, after sprocket change you become next +%7. When speedo show you 100kmh you ride only 85

Acceleration comes from power, not from sprocket. And sprocket doesnt impreve engine power. You become just ilussion and faster growing rpms.

Changing sprocket to bigger you will become lower rpms, more quiet and better MPG. Acceleration decreasing (real) is small. IMHO you can feel worse acceleration only at start from 1st gear (engine stays longer in interval 2000rpm-8000rpm). When engine reaches 8500rpm you will have full engine power, so changing gear up in 10500 can give you full power (15T).

Last edited by Arbiter; 11-20-2012 at 06:09 PM.
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post #8 of 28 Old 11-20-2012, 06:53 PM
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I made the switch to a 15T / 36T setup and really liked it. I agree with some of the previous posts. I can't seem to figure out why everyone wants to make 250 a race bike. I mean, if it for a 250 class, then it makes sense, but if you want to go fast, buying a 250, re-gearing it and adding 5 hp is not the way to go. Get a 600 or something.

On the other hand, for riding enjoyment, great gas mileage, and a fantastic bike to learn on, the CBR 250R is the ticket.

PMP sells the 15T sprocket. If you do the 36T in the rear at the same time, the chain length works out very well.

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post #9 of 28 Old 11-20-2012, 08:03 PM
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Quote:
Originally Posted by sniper1rfa View Post
It's a 250 four stroke single, who gives a **** about acceleration?

+1 is awesome for reduced buzzing on the highway. +1/-2 if you don't ride in the mountains.

Longer gearing makes the bike way more easy going in town and on the highway, and makes first way less annoying. Considering the huge number of threads related to gearing the bike up I know I'm not alone in thinking it's actually geared too short, not too long...
I'm one of those riders who does happen to give a f**k about acceleration, more than I care about top speed. With stock 14/38 sprockets, this bike doesn't pull 4th, 5th, 6th gear very well, especially at the altitudes I ride at, 7000 to 10000 feet above sea level. The 13T front sprocket makes a world of difference.
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post #10 of 28 Old 11-20-2012, 08:12 PM
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Quote:
Originally Posted by Arbiter View Post
IMHO smaller sprocket doesnt improve acceleration, just the speedometer digits are more nice for you (they are +7% fake after sprocket change). If you are in Europe, where OEM speedo is about +9%, after sprocket change you become next +%7. When speedo show you 100kmh you ride only 85

Acceleration comes from power, not from sprocket. And sprocket doesnt impreve engine power. You become just ilussion and faster growing rpms.

Changing sprocket to bigger you will become lower rpms, more quiet and better MPG. Acceleration decreasing (real) is small. IMHO you can feel worse acceleration only at start from 1st gear (engine stays longer in interval 2000rpm-8000rpm). When engine reaches 8500rpm you will have full engine power, so changing gear up in 10500 can give you full power (15T).
13T front sprocket does as a matter of fact improve acceleration. As to your declarations regarding speedometer error, when you make final drive gearing changes the speedo/odometer can be corrected with this: 12oClockLabs... as a matter of fact, my bike has a SpeedoDRD installed and programmed to correct for the 13T sprocket and the speedo "factory" error, so I am under no illusions as to what the actual/indicated speed of my bike is... actual and indicated speed are one and the same.

I never claimed that a sprocket change would improve engine power... FYI I've been tuning motorcycles for over 40 years. I find that your reply to my previous post is indicative of someone who knows little about the subject at hand, not to mention just a bit condescending.

Last edited by MotoMike; 11-21-2012 at 12:27 AM.
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