Our team is currently in the process of redesigning our drivetrain. Currently, we use four 600 rpm motors with a 3:3:5 gear ratio. We have two omni wheels in the front, and two traction wheels in the back, all 3.25”. However we cannot get over the pvc bar in the center, so we are considering using 8 wheel 6 motor drive, with 6 600 rpm motors
, and each side would have an omni followed by two traction, and then another omni. I’ve been told that 2.75” have the highest traction, and another team I’ve seen uses these sizes and can easily climb the bar. However, many teams also utilize 4” wheels. Will both sizes work? (Also, this is my first post, so if I’m doing something wrong please let me know 
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Don’t worry
I thought all wheels have the same amount of traction…
Anyways, use barrier sleds to help you get over the barrier
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What I’ve seen is that any size wheel can get over the barrier with a built in ramp. The deciding factor is your offset gears. If they are too large, they will get your robot stuck in the barrier. What you described sounds good.
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Also even if you decide to off set your gears, many teams add like a bar that is lower than your gear, in order to smoothly go over the bar.
I would do all omnis instead of the 2 tractions in the back. It allows for more movement and better control
Honestly, imo (for me) the best drive speed is 400 on 4 inch wheels You got the big wheels for barrier crossing and then you also got REALLY good speed and torque
Bro what? In my opinion a good drive is 8 3.25 in and a 450 rpm.
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