[B_Alley]

Scrub radius doesn't have anything to do with the amount of grip a tire will produce. It's the distance (in front view) between your steering axis intersection point and the tire contact patch center point. Since all your forces go through the center of the contact patch (not exactly, but we'll keep it simple for now) the farther that steering axis is from the contact patch, the more torque is going into the steering system and therefore the driver senses more 'feel'.

When designing suspensions and steering systems for our formula cars, I'd always try and keep the scrub radius as small as possible because this meant less torque going into your steering system, meaning you could make things super light! However, too light, and the driver can't feel what the tire is doing at the limit!

I would recommend going with an offset that would give you the largest track width, since that will reduce weight transfer, which increases tire efficiency, which helps rip your face off harder while cornering! Just try not to go too big on the scrub radius because then stuff can start to break! What options are you looking at?