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Old 16th October 2019
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Maxeffort Maxeffort is offline
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fifth gear is direct.. 1:1
trans input speed = output speed.
Its not actually a gear that you can change.

The only way to change final drive ratio in fifth is to change sprocket, or pulley.
You can also make an overall change with engine and trans sprockets.

What sport gear does is change the ratio in gears 1-4, and fifth is still direct. (And there will be a larger gap from fourth to fifth)

If your goal is to have the same acceleration as now in 1-4, then lower the RPM in fifth, sport gear would basically accomplish that with a sprocket/pulley change.

With the same sprockets/ pulley you have now. Sport gear would give you lower gearing 1-4, and the same RPM in fifth.
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