Found a picture of an old poster that shows the gear ratio.
I also believed that the CTR only had 5 gears - but this proves me wrong.
With a rpm max at 7750 the maximum, theoretical speed in each gear:
1st: 80-85 km/h
2nd: 145 km/h
3rd: 205 km/h
4th: 260 km/h
5th: 295 km/h
6th: 365-370
To me this looks strange. The ratio between each gear decreases, but it looks like the 5th gear are awfully short, and that 6th are really long.
But then again, it's primarily geared for maximum velocity