Totally depends on how the kite was designed... too short lines on some kites will kill all the power, whilst too long on others will create too much drag and send you downwind. Typically though I would say a 5m would feel best on anything from 19-24m lines. That goes for most kites. My preferred length for all-round riding and freestyle is 24m.

I have 25m lines which are fine for my 7,9 and 12m TS kites

But on my 5m Cabo

Its looks so small and far away

Unfortunately whenever it gets windy enougth to take the 5m for a spin here on the Sunny Coast

it is usually pretty stormy gusty volitile wind

So I need to loop it thought the lulls

Which means getting slingshot downwind at a hundred miles an hour,

if you dont time it right between the gusts

My mates 5m ozone C4 came with 17m lines

But he said it was gutless

I have some 20m lines,might try them next time I take the micro rocket out

What I need is some steady 35 kt wind to go with the 5m kite