Orbea Gain D40

[Pompeymac]

Hi I'm new to the pedelec community although not electric bikes as I'm on my 5th. I'm looking for some advice with regards my current bike.
It's an Orbea Gain D40. I was out on a ride yesterday and managed to get two flat tyres at the same time as I went over a cattle grid
I'm looking to change the tyres for gravel ones as I'm hoping that they will give more puncture resistance on the roads and cattle grids in Southern Scotland.
The Orbea site says it's gravel ready and can take up to 40c tyres. I've found some 35c tyre's I like on CRS.
This is probably a stupid question however here goes.
My question is will these fit the wheels that come with the Gain D40 and what size of tubes will fit the wheels. Do I get 18-28 or 28-42.
Thanks in advance.

 

[boyabouttown]

I have the schwalbe g one 40mm on similar bike, which i think used to be on the orbea gravel version, tubes are 700x35/43

 

[Pompeymac]

Thanks very much for your reply. You have put my mind at rest.
I couldn't wait and I took the plunge earlier and ordered a set of schwalbe g one all round and 35-45c tubes.
Thanks again.