Originally Posted by TryHard

Again, still don't know why max RPM is useful.. as full boost will have been long added before then. But anyway, I've updated the speed chart to help a little.
Second tab, has a summary table of what speed should be achieved for a given rpm vs rollout (thereby removing gearing/tyres/etc from the equation). For 42kph, your rollout is going to need to be near 70mmpr if you think your only getting 11,000rpm.

HiH
Ed