I didn't realise the Jam2 was as light as 20.4kg's.
The runs we do here would be lots less than 25 miles. Our longest run is about 30k's about 12k's of which would be steady climbing. That is why is was thinking something light with a 300 to 500 Watt Hour battery would more than handle we we...
You have a few options but better if you have a car to get to the best spots. I would suggest:
Castlewellan Forest Park
Rostrevor (much better option for an ebike with the climbing involved)
Tollymore Forest which is where we spend our time. Great natural trails but the ebike is a nice to have...
The Lapierre drew my attention. The motor and battery are removable and you can replace the battery with a storage compartment and the motor with a crank set apparently and it turns into a standard MTB giving you the best of both worlds.
Myself and a couple of friends are thinking of making the switch to EMTB but for the type of riding we do here in Northern Ireland, my research so far, has me leaning towards the lighter weight bikes like the Specialized Kenevo SL, Lapierre Zesty AM or the NOX Helium. All are around the 18kg's...