[skidlids]

What rpm are the speeds based on

If a 620 Six speed flat out under the required conditions could do 147mph on 15/36 gearing what would a 5 speed version likely pull, also would a 674 be able to obtain the same speed in the same conditions on the same gearing.
I assume my 583 would need to run 15/38 in the same conditions that allow a 620 six speed to run 15/36
If 15/36 is around 15mph per 1000rpm then 15/38 would be nearer 14mph per 1000rpm which would equate to the less powerfull 5 speed bikes being about 8mph down on topspeed.
can't see me passing many bigger cc bikes down the straights.
Best I hide the NOS under the seat for CC and Snet.