The number of bicycle wheels is 2 × 3 = <<2*3=6>>6.
The number of tricycle wheels is 3 × 4 = <<3*4=12>>12.
The number of unicycle wheels is 1 × 7 = <<1*7=7>>7.
The total number of wheels is 6 + 12 + 7 = <<6+12+7=25>>25.
#### 25