The stock gearing on the 2001 ZX-6R is 15 to 40. If you go down one tooth up front, the gearing will be 14 to 40, or 1 to 2.9. Simply put, going down one tooth up front is equivalent to going up 2.9 teeth out back. As you can tell from the numbers, going up two teeth out back is less pronounced than going down one tooth up front, which in turn is slightly less pronounced than going up three teeth out back. On the street, gearing is a personal choice--simply choose the gearing that suits you. On the track, the proper gearing is the one that avoids first and sixth gear, if possible.
It is simpler to go down one tooth up front because the rear wheel does not need to be removed. Also, front sprockets often cost less than rear sprockets.
If your bike does not currently redline in sixth gear, and still does not after you change the gearing, the top speed will be no different.
The stock chain on the 2001 ZX-6R has size 525. It has 108 links and is made by EK.
Edited by - Rob Lee on 11/17/2002 12:48:28