I know that at the same rpm, he will go faster with a smaller rear, but that wasnt what I wrote.
I wrote that a +2 rear sprocket will add 300 rpm to get to the same speed as the stock 45. But if he cant rev out in 5th gear,the engine will struggle even more to rev with a smaller rear, reducing topspeed. This is very noticable when going uphill. So tats why he needs to go the other way, if he reall wants higher top speed. If it rev'ed close to redline, a smaller rear would be better.
I added the 1990 xt600 on gearingcommander
His problem seems to be that he cant rev muvh past where the engine has the most torque, so to me the gearing must be too tall.
I use 16/45 for daily use, to keep my revs down when cruising, but it doesnt give me better topspeed, or better mpg as you need to rev out the gears slightly more, as they're "further apart"
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