Sonar Demon EDM Overview 

No. They are too hard. Outdoor you want something 88a or lower

All of our Sonar and Radar wheels take 8mm bearings. Thank you.

@@RiedellRoller what does 8mm means

@@ejthegoat9463 8mm is 8 millimeters which is the size of the bearing that our Radar and Sonar wheels take. Each wheel will take 2 bearings, for a full pair of skates you will need 16 8mm bearings. Our bearing brand is KwiK Bearings and are designed work great with all of our wheel offerings. You can learn more about our KwiK bearings here: www.roller.riedellskates.com/Catalog/KwiK-Bearings. Thank you.

That's the size of the truck that it fits on. There are very few that are 7 mm