Risers work fine for the most part, I used a pair with my Wald 139 for awhile and it worked out just fine. However the only thing I noticed that the brackets that go over the bars took away room for me to mount my light in the center area of the bar. I measured the center flat area on my risers and from bend to bend it is about 110 mm long(which isn't very long at all). If you like having your light mounted in the center I would try to find something with a wider flat area, if not things might get interesting for mounting it there.