MZ/MuZ Riders

Can anyone of you gentlemen with tachometer, tell me how fast my ts250 four speed
is spinning at 60 miles an hour?
70 miles an hour?
In fourth gear , of course.......
I don't know what the gear ratio in final drive is compared to a supa 5 or etz251

Thank you
Michael

On my Etz 251 6000 rpm is 74 mph on my gps phone so
1000=12.33 mph
2000=25
3000=37
4000=50
5000=62
6000=74
7000=86. Head down on the tank, This thing is flying
8000=99 Bloody hell that's a steep down hill bit SCREEEEEEEEEEEEEEEEECH Oh shit it needs a re-bore and I need new pants