i have got a zhi z2 which is 1075mm +35mm, but the z1 is 1080mm +35mm, so pretty much the same i did use a echo 130mm 15 deg and it felt so nice, but now i use a USE stem 130mm 8 deg but ive got 10mm spacers so the bars are in the exact same place, well pretty much. id say go for that kind of size, echo 130mm 15 deg, i did have a hope 90mm 10 deg, but i was really squished on the bike, so dont go small tom