Riser bar? I'm not sure what you're asking. The Nitto bars I used (similar to the Milano ones) have a short grip area. I'm sure they could accomodate shift/brake combination levers but when I used grip shifters I had very little room for grips. In fact I had to ride with my hand on the grip part of the grip shifter. it looked unbalanced and felt that way too. They would be perfect if you used anything other than grip shifters.

The OV Milano bars have a longer grip section so the grip shifters and brake levels fit and feel just fine. Ironically I hope to find a nice mixte one day and use the Nitto bars I still have, but with only brake levers (I'll want down tube shifters). If I were to do it over again I'd get the OV bars due to price, but I own this Nitto bar now so I plan to use it one day on a mixte.