I suppose I'll changed the front one and chain too. I'm wandering if i should changed it for a 2T up on the rear. I've read good things about it.
Depends which bike and what you want it to do differently. Going that way normally sharpens up the drive through low gears at the expense of higher revs when cruising on the motorway. If you find first a bit long requiring you to slip the clutch a lot, and do lots in town, twisties or track, it makes sense. If you do big miles motorway cruising, I would think twice. On some bikes (speedo triggered from output shaft) it will mess your speedo accuracy up, reading higher than actual for which you will need to get a correction module.
For me, on my 1260 Multi, top speed is really an irrelevance in practical terms. Went 14/40 due to limited rear sprocket choice. Combined with throttle spacer and exhaust valve disconnect it transformed to bike, especially for riding in town and traffic. Maybe not quite so lazy on motorway/autoroute but I avoid that were possible.
