Which islabike

My son is 4 & has been riding his cnoc 14 since his third birthday. He is starting to look a little big for the bike now & we were thinking about buying the cnoc 16 but when I was looking through the sizing specs, I realised he is almost big enough for the beinn 20. Should I wait until he fits that bike or should I just get the cnoc 16? I'm concerned that he may struggle with the gears if we get him the beinn. Any thoughts or experiences would be appreciated.
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Its great that they did not try to get you to waste money on the 16" but I would say you could still go with the advice all 3 of the people you asked on here have given.
As you have ruled out the 16" you can get a bigger bike at any time and see for yourself how it fits.
Loads of people and even LBS shove kids onto bikes that are too big for them, and I am certainly not suggesting you do this, but equally I would not wait until the exact point that Islabikes say it is OK.
I am guessing he is not riding it on a B road, so whats the harm in getting it now?