Alternative for Schwalbe Kojak 35-584 tire I bought a Canyon Commuter 7.0 bike. It has 27.5 inch DT SWISS XR331 rims and Kojak 35-584 tires. It seems as if Schwalbe is the only manufacturer having a 35-584 sport tire. Do you know of any alternative for this tire that will fit my wheels?
You don't need to replace the tire with a tire that is exactly the same ERTRO. And while ERTRO's are probably the most accurate tire measurement, they still aren't all that accurate. One manufacturers 35-584 can be slightly wider/narrower than another's. 

See http://www.sheldonbrown.com/tire-sizing.html

Unless the bike has very tight clearances ( unlikely for a Commuter bike) you should be able to use any tire in the range 30-584 to 40-584 ( or even larger). The only important number in the ERTRO designation is the rim size (i.e the second number). 

Panaracer makes some good relatively cheap 650B ( or *-584) tires[1] that would likely work well on that bike if you don't want to stick with Schwalbe. Schwalbe has a pretty nice range of 650B tires in "road" widths. 

If you search for 650B Road tires, you should get a pretty good selection of tires that will work for your bike. 

[1]- Col de la Vie or Pasela.