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As my go to touring tyre the Marathon Supreme is getting both hard to find and exensive I was looking for alternatives. I ended up going for a Conti Contact Urban for the rear (also hard to find) and a Marathon Almotion for the front.
The Almotion looks a bit like a replacement for the Supreme but not fully slick. Theb Almostion sells generally for £35-£45. Currently on Amazon in 700x40 for £26.
Note - this is the HS603 version for using tubes. There is TLE tubeless version which has thicker sidewalls and is heavier. THe HS603 is 500g.
https://www.bicyclerollingresistance.com/tour-reviews/schwalbe-marathon-almotion-addix
https://www.amazon.co.uk/dp/B07X1KDGBJ?ref=ppx_yo2ov_dt_b_product_details&th=1
Sounds a great price for these, but I have barely worn ~14 month old Supremes on my commuter!