Hello brettsnz and Mod BB

I'm not sure what you mean by maximum cutting height.
This could relate to the height adjuster, or the height of grass
this mower can reasonably cut.

I guess the adjuster would go up to 25-30 mm.
As a general rule, reel mowers will cut grass up to about three-quarters
the diameter of the reel. That's about it.

Hope this helps.
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JACK