Fitted the 43T and much happier with the low end and still pulls well, still need a PCV etc to reduce the jerkiness.I also went with a 43 tooth rear and i am happy with the results, bike just feels better at low speed town riding and I feel it hasn't lost anything mid range or top end.
Perhaps because not everyone has the same view of riding as you. For example, and yes he stunts and yes it is a sales video but he could easily also sell longer gears if he agreed with you.Hi all, new to the forum but came across this thread and thought I would pass on my set-up.
I have a 2017 390 Duke which I use for commuting, touring and squirting in the hills.
So, after experimenting (playing with gearing is both cheap and easy) I settled on 16/42.
Other than stunting, I cannot understand why some folks go even shorter gearing than stock.
Thats weird as I gained torque all over with 14T45T (which is almost the same at 15T43T). reduced my top speed to 154kph at 10000rpm. I'm running a BMC filter with an opened airbox lid, Rapid Evo piggyback, Decat pipe and Arrow Pro Race exhaust on 98 fuelI run a stock 15T in the front and 43T in the back and I think it’s a big improvement as 1st and 2nd gears are actually useful now; however, I lost a wee bit torque on the top end with speeds over 100 km/h, so if I would do it again I would get a 44T in the rear. No observable change in fuel economy on the 43T sprocket. I ride 60/40 hwy city.
That’s not weird as more teeth in the back gives you more torque at the expense of higher rpm (lower top speed). I found that there is a world of difference between 43T and 45T that I ran before switching to 43T.Thats weird as I gained torque all over with 14T45T (which is almost the same at 15T43T). reduced my top speed to 154kph at 10000rpm. I'm running a BMC filter with an opened airbox lid, Rapid Evo piggyback, Decat pipe and Arrow Pro Race exhaust on 98 fuel