The Park SS-15 Single Speed Spanner is designed and built especially for single speed bikes. The SS-15 is a forged spanner with a 15mm socket wrench for axle nuts, 15mm open end wrench for pedals, tire lever, and bottle opener. Just the right size and length (17cm/7") to take along or to wrench in the garage. Any rider with a single speed would be certain to find the SS-15 very useful.
As a wrench this works fine. But no better than any hardware store box end wrench, and maybe a but worse due to its short length. Its also too heavy to be considered portable. Where this thing really shines is as a tire lever.
The wrench provides a really wide surface area for spooning tough tires onto rims. Really works great at spreading a high load on the tire bead. Particulary for ultra stiff beads on Hutchinson road tubulars, which I have ripped using a standard narrow plastic lever.