Either with a smaller front or larger rear sprocket?

Loads of people running 16-40 and even 16-41.
I'm running 16-40 and really like it!
You can use https://www.gearingcommander.com to see the difference in rpm certain ratios give.
Just change the max rpm to 9800 if you want to see the top speed.

Thanks for the info.
I'm considering doing it so I can raise the revs at lower speeds to smooth things out.
As it is I don't find myself using 5th or 6th gears hardly at all.

I've seen these which seem a decent cheap way to try the lower gearing.
https://rover.ebay.com/rover/0/0/0?mpre ... 1584711972

Was running 16/38 but have swapped rear to 41. What a blast to ride. Front wheel comes up easy though. Easier to ride around town as well.