TDLR: nice addition to the performance pack, Makes bike accelerates faster, max speed (GPS) 125-130+ kilometers. Cheap and easy to install.
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I installed the sprockets a few weeks ago and I felt the acceleration of the bike increase to something more noticeable.
When I installed the 14t front sprocket I pretty much felt almost nothing, but now with both the front and back -1/+2 it feels great.
The bike runs fine with a 14/44 tooth sprockets, 6th gear is better now.
1st 2nd 3rd gear is instantly over.
I use 4th or 5th mostly for city. *speeding is bad kids. 5th hits limiter around 120 on the stock speedo which is off by 8-10 kilometers. *so actual speed is around 110
top speed loss is around 10%
While going downhill the rev limiter in 6th hit around 125-130 GPS tracked kilometers. *I wasn't really paying attention was racing an R1
I did a stupid test, I rode in pouring rain with all my gear soaked, I weigh 240 pounds with no gear and average sustained speed was 110 tracked with GPS on a flat. Don't worry about your top speed unless you weigh 300+ pounds and your bike runs like garbage.
*Bike is clean now
My Current performance set up:
CBR125r 2007 *Also known as the CBR125RR Fireblade limited edition
Black widow full exhaust system *some cheap stuff from the UK pretty much same as oem
K&N High flow Air Filter *This doesn't do anything I'm just lazy to change paper filter
Pirelli MT75 Front and rear tire *Sticks so you wont crash
Performance pack + 100% synthetic oil *good stuff
JT 14T Front sprocket JT 44T Rear sprocket JT Heavy duty chain *The thing im talking about
Shorai Lithium battery *expensive
*follow me on instagram @wowitschowder