Hey, I have 4 2d cars all of them have the same settings on the wheel joint and rigid body but still some cars are slower why?
racer #1 for some reason is slower than the other ones even tho he has the same speed
and racer 4# is faster
what should I change? in order for all of them to be at the same speed
If you’re using the joint to move the body then it’s relying on contact friction of the material you’re using. Beyond that, when it applies a force it’ll be inversely proportional to the mass; if you’re using auto-mass option on the Rigidbody2D then they’ll potentially have a different mass.
The speed isn’t linear speed though, it’s just how fast those (CircleCollider2D?) are rotating so friction and mass and the time-in-contact with the “ground” are the only potential differences beyond differences in WheelJoint2D configurations.
Beyond that I couldn’t guess.
Thank you 
they have the same mass But I will play with the tine in contact with the gound and with the speeds I hope to get them right
thank you