I'm talking about you driving it in 5th gear numpty
, when you drove it you took it just past 6k in 5th. In any other gear it has to be taken to 6.5k without a doubt (and you did). It leans off after 6, thats why I got ya to let off.
172mph was worked out using the gear ratios etc.
7.2k on 215/40/17 would be 174mph providing it could pull to that rpm in 5th.