Join Date: Nov 2005
Location: New Orleans, LA
I had a Gen1 and now own a Gen3. I ran and currently run the +2 rear option on both bikes.
I have found that you get the shorter 1st gear, but do not lose a ton of top end. The indicated speed on the speedometer is about +5mph faster than true speed. You get a quicker rev/spool through the gears. All gears will become slightly shorter and mid range will beef up (rev to mph ratio) so take that into consideration for turns.
Examples (for my 2009 ZX10 which is now +2 rear)
Stock gearing 3rd gear 8500rpm=95mph
+2 rear 3rd gear 8500rpm=90mph
Stock 3rd gear speeds: RPM 2450/27, 3700/40, 4900/54, 6100/68, 7300/81, 8600/95, 9800/109
+2 rear 3rd gear speeds: RPM 2450/26, 3700/39, 4900/52, 6100/65, 7300/78, 8600/91, 9800/103
What you can see is that with a +2 rear to maintain the mph you will have a slightly higher rpm rate which keeps you in that mid to high powerband that the ZX10s a known for.
Hope this helps.
Last edited by smalls23; 10-03-2013 at 06:52 PM.