There are 2 cars with 4 wheels each so that's 2*4 = <<2*4=8>>8 wheels
Two bikes and a trash can each have 2 wheels so that's 3*2 = 6 wheels
Each roller skate has 4 wheels and there is a pair, which means 2 skates for a total of 4*2 = <<4*2=8>>8 wheels
Including the 3 wheels on the tricycle, there are 8 from the car, 6 from bikes and a trashcan and 8 from roller skates for a total of 3+8+6+8 = <<3+8+6+8=25>>25 wheels
#### 25