Terra Speeds roll really well - much better than most would guess given they have raised knobs ...
I currently have them on two bikes - and will have them on a third bike soon
they do run small - 35’s are close to 33mm and the 40’s are close to 38mm
the 40’s can vary in weight - have one pair that weigh around 410g (each) - another pair around 460g ... both blackwall ... the tan wall (cream) pair weigh around 450g (each)
I also have S Works Pathfinders and Tufo Speederos to try - but they will need to wait