The used car lot has 24 / 3 = <<24/3=8>>8 motorcycles with 2 tires each.
The lot has 24 - 8 = <<24-8=16>>16 cars for sale
There are 16 / 4 = 4 cars with a spare tire with 5 tires each.
The lot has 16 - 4 = <<16-4=12>>12 cars with 4 tires each.
Thus, the used car lot’s vehicles have 8 * 2 + 4 * 5 + 12 * 4 = 16 + 20 + 48 = <<8*2+4*5+12*4=84>>84 tires in all.
#### 84