I'm thinking about changing the gearing to something more aggressive, want to get more low end acceleration. I know I need to go bigger on the rear sprocket, or smaller on the front. Was looking at Renthal, and they make 47, 48 and 50t sprockets that seem to fit.
What do you folks suggest that will give me more acceleration and won't throw things out of whack?
Gearing changes are one of my favorite subjects, I have nine different gearing combinations for my Thruxton R.
Your stock is 16T/42T. People calculate it a two ways I use the rear divided by the front to get 2.625 in this case, this method means the higher the number the lower (more low end).
The T120 stock is 17T/37T or 2.1764 which is quite high by comparison.
Quite frankly the internal gearing on the Thruxton R when combined with the 16T/42T gearing is already so low it almost takes a magician to go from 1st to 2nd without hitting the rev limiter on the drag strip.
Now if your want a little more low grunt from a roll on then getting a bigger rear sprocket would better than going smaller than the 16T.
I would not going in larger than a 44T on the bike, and if your in sport mode with the traction control off the bike may try to throw you off with a 1st gear roll on.
The 44T would probably slow you down at the drag strip... from my experience. You lose about .1 to .3 when you bounce off the rev limiter depending how long it takes you realize it.
P.s. You may need a longer chain for a 44T if your chain is new.