70mph in top gear???

[midden]

A few pounds perhaps.   You can't put a guaranteed standard on how hard an engine has to work.

RPM, transmission, gear ratios and wheel speed are proportinal to each other. The only thing between them is the clutch. Don't know what else were you talking about.?
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engine won't need to work as hard going down hill as it would going up hill for the bike to reach 70mph