Since I swapped out to 15/42 I've found that 6th has nothing power wise, it didn't really have much with the 14/43 though, it's brilliant for sitting on the hwy in 6th doing 100kph at 7000rpm, but, if I need to overtake I need to shift down.
The 15/42 is good for blasting around from 1st to 5th though, 6th is exclusively for commuting.
My bike is just a daily hack though, it still pulls slowly in 6th but only from a shift from redline in 5th, but, you could have a coffee and smoke while waiting to gain 1000rpm.
It's no 600 or 1000 but it's not bad for a little 4 stroke 250.
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