went from 14t sprocket to 15t

speedgsx98 · May 8th, 2009, 03:45 PM

Here in CA, I like to go an indicated 75mph on the freeways, and with OEM gearing it was revving at 8900 rpm at that speed. Now, with the 15t front sprocket, 75mph has me at 8150 RPM or so. Now, when I put on the 120/80/16 rear instead of the OEM 130/80/16, I should be around 8500 @ 75mph. Overall, so far so good. Took only 30 minutes. Would've been less, but I'm a perfectionist when it comes to chain slack =)

Did notice a slight loss in acceleration, but first gear is also taller, which is a benefit...depending on who you ask.

Snake · May 8th, 2009, 08:13 PM

I have a 15T on mine and I love it. Hwy cruising is so much better. A very cheap and useful mod.

Verus Cidere · May 9th, 2009, 11:21 PM

Question! Where do you go to get these sprockets, and what criteria must they meet to fit our bikes. I don't have an owners manual, so I don't know what the specs are. Thanks.

hzrnbgy · May 10th, 2009, 12:10 AM

check out sprocketcenter.com

they have front and rear sprockets for ninja 250 1988-2009

i got my 13T front countershaft there (better pulling power from stoplights)

speedgsx98 · May 11th, 2009, 04:18 PM

you can get them from Denniskirk.com or motorcycle-superstore.com

Around $15.

Rode again on the freeway and what a joy to use a stupid word. Bike is much qieter cruising at 8200rpm, than 9000. Very pleased with this mod. Acceleration isn't quite as brisk at freeway speeds, but everyone says mpg's are better with the 15t frt and 45 rear. If i notice a benefit, I'll leave it on there, if not, I'll think about taking it off. I use my bike a lot on the freeway and just prefer not to be revving so high all the time. Plus, this engine delops peak torque at 8500rpm, so cruising at an indicated 80(actual 75) puts me right around there with the 15t.

May 8th, 2009, 03:45 PM	#1
speedgsx98 ninjette.org member Name: Dave Location: San Diego Join Date: Apr 2009 Motorcycle(s): 250 ninja 2002, 2008 ZX10-R Posts: 149	went from 14t sprocket to 15t Here in CA, I like to go an indicated 75mph on the freeways, and with OEM gearing it was revving at 8900 rpm at that speed. Now, with the 15t front sprocket, 75mph has me at 8150 RPM or so. Now, when I put on the 120/80/16 rear instead of the OEM 130/80/16, I should be around 8500 @ 75mph. Overall, so far so good. Took only 30 minutes. Would've been less, but I'm a perfectionist when it comes to chain slack =) Did notice a slight loss in acceleration, but first gear is also taller, which is a benefit...depending on who you ask.

May 9th, 2009, 11:21 PM	#3
Verus Cidere ninjette.org certified postwhore Name: Michael Location: Southern NM Join Date: Feb 2009 Motorcycle(s): '91 Honda CBR600 F2 Posts: A lot.	Question! Where do you go to get these sprockets, and what criteria must they meet to fit our bikes. I don't have an owners manual, so I don't know what the specs are. Thanks. __________________________________________________ 1991 Honda CBR600 F2, White/Gray, D&D slip-on exhaust, tail integrator, gel grips, Custom undertail.

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May 8th, 2009, 08:13 PM	#2
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	I have a 15T on mine and I love it. Hwy cruising is so much better. A very cheap and useful mod.

May 10th, 2009, 12:10 AM	#4
hzrnbgy ninjette.org member Name: HzrnBgy Location: Hawaii Join Date: Apr 2009 Motorcycle(s): 2009 Black Ninja 250R, 2004 Yellow Ninja 250R Posts: 111	check out sprocketcenter.com they have front and rear sprockets for ninja 250 1988-2009 i got my 13T front countershaft there (better pulling power from stoplights)

May 11th, 2009, 04:18 PM	#5
speedgsx98 ninjette.org member Name: Dave Location: San Diego Join Date: Apr 2009 Motorcycle(s): 250 ninja 2002, 2008 ZX10-R Posts: 149	you can get them from Denniskirk.com or motorcycle-superstore.com Around $15. Rode again on the freeway and what a joy to use a stupid word. Bike is much qieter cruising at 8200rpm, than 9000. Very pleased with this mod. Acceleration isn't quite as brisk at freeway speeds, but everyone says mpg's are better with the 15t frt and 45 rear. If i notice a benefit, I'll leave it on there, if not, I'll think about taking it off. I use my bike a lot on the freeway and just prefer not to be revving so high all the time. Plus, this engine delops peak torque at 8500rpm, so cruising at an indicated 80(actual 75) puts me right around there with the 15t.