Rear sprocket question

reroka · April 26th, 2014, 05:09 PM

Since my two local shops are unable to install a 15 tooth front sprocket. I have to change my rear. So my question is, if I go to a 43 tooth rear sprocket will that do the same as going to a 15 in the front? Or would I need to go to a 42?

Motofool · April 26th, 2014, 05:39 PM

Quote:

Originally Posted by reroka

Since my two local shops are unable to install a 15 tooth front sprocket. I have to change my rear. So my question is, if I go to a 43 tooth rear sprocket will that do the same as going to a 15 in the front? Or would I need to go to a 42?

http://faq.ninja250.org/wiki/Changing_gearing_J_bike

http://www.dropbears.com/u/utilities/sprocket.htm

14/45 (stock) = 3.21
14/44 = 3.14
14/43 = 3.07
14/42 = 15/45 = 3.00

You may need to shorten your chain.

Again, you are following the wrong path for no reason, just bad advise.

The bigger the smallest sprocket, the less stress on the chain.

DaBlue1 · April 26th, 2014, 05:48 PM

Quote:

Originally Posted by reroka

.... if I go to a 43 tooth rear sprocket will that do the same as going to a 15 in the front? Or would I need to go to a 42?

15/45 has the same ratio as 14/42.

Alex · April 26th, 2014, 06:35 PM

You're missing the point. Avoid both shops that are feeding you crap. Heck, there is a DIY thread at the top of our tech section that can walk you through installing the correct 15 tooth up front.

C-Bass · April 26th, 2014, 06:56 PM

Standard set up is 14/45, I think I will eventually be going up one tooth to 15 on the engine sprocket for my 2012 ninja 250.

No reasons why there should be any problem doing that.

csmith12 · April 27th, 2014, 08:45 PM

Quote:

Originally Posted by reroka

Since my two local shops are unable to install a 15 tooth front sprocket.

/pulls up a chair

WTF? I gotta hear the reason for this.

Alex · April 27th, 2014, 08:48 PM

misfitsailor · April 27th, 2014, 09:29 PM

I tried a 15 tooth sprocket, but found that I didn't like the increased vibration. The stock counter sprocket has a rubber insert that helps isolate vibration. I went back to the stock sprocket and instead changed to a 41 tooth rear sprocket. I had to remove 3 chain links, as I remember.

To each their own.

csmith12 · April 27th, 2014, 09:36 PM

Quote:

Originally Posted by misfitsailor

I tried a 15 tooth sprocket, but found that I didn't like the increased vibration. The stock counter sprocket has a rubber insert that helps isolate vibration. I went back to the stock sprocket and instead changed to a 41 tooth rear sprocket. I had to remove 3 chain links, as I remember.

Yep, I noticed the rubber bushing the first time I removed the sprocket. While I do like that, it's something that you're gunna have to come to terms with, as the stock one doesn't last forever. Of course you could get used fronts but better stock up now. There are other solutions to the vibration problem anyway.

Interesting note, I like the stock gearing on a pregen vs. 15/45 on a new gen. Go figger', never really thought about it.

April 26th, 2014, 05:09 PM	#1
reroka Biker Noob Name: Richard Location: Durham, North Carolina Join Date: Apr 2014 Motorcycle(s): 2004 Honda Shadow 750 Aero Posts: 176	Rear sprocket question Since my two local shops are unable to install a 15 tooth front sprocket. I have to change my rear. So my question is, if I go to a 43 tooth rear sprocket will that do the same as going to a 15 in the front? Or would I need to go to a 42?

April 26th, 2014, 06:35 PM	#4
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	You're missing the point. Avoid both shops that are feeding you crap. Heck, there is a DIY thread at the top of our tech section that can walk you through installing the correct 15 tooth up front. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

April 27th, 2014, 08:48 PM	#7
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	__________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

April 27th, 2014, 09:29 PM	#8
misfitsailor Ninjette Jockey Name: Tim Location: Stockton, Ca Join Date: Oct 2010 Motorcycle(s): Ninja 250R, Harley Davidson Heritage Softail, 2 Honda Monkeys, Polini & GRC mini GP Posts: A lot. Blog Entries: 3	I tried a 15 tooth sprocket, but found that I didn't like the increased vibration. The stock counter sprocket has a rubber insert that helps isolate vibration. I went back to the stock sprocket and instead changed to a 41 tooth rear sprocket. I had to remove 3 chain links, as I remember. To each their own. __________________________________________________ For what shall it profit a man, if he shall gain the whole world, and lose his own soul?.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Chain and Sprocket Question	RandomPhantom	2008 - 2012 Ninja 250R Tech Talk	6	February 25th, 2014 01:44 AM
JT Sprocket 42 tooth Rear Sprocket	lolibater	Motorcycle-related	36	February 25th, 2013 12:30 PM
JT Front Sprocket Question	Jim Moore	1986 - 2007 Ninja 250R Tech Talk	10	June 27th, 2012 04:45 AM
Sprocket question from a newbie	cryllyn	2008 - 2012 Ninja 250R Tech Talk	4	April 16th, 2012 10:25 PM
Stupid Sprocket Question	demp	2008 - 2012 Ninja 250R Tech Talk	14	September 7th, 2010 01:32 PM

April 26th, 2014, 06:56 PM	#5
C-Bass ninjette.org member Name: C-Bass Location: Alberta Join Date: Mar 2014 Motorcycle(s): Currently own: 98 Honda VTR1000, 02 Suzuki's DR200 & DR650, 04 & 08 BUSA's, 05 Ducati SS1000, 12 Ninja 250R SE Posts: 59	Standard set up is 14/45, I think I will eventually be going up one tooth to 15 on the engine sprocket for my 2012 ninja 250. No reasons why there should be any problem doing that.