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Originally Posted by HEMI-Fit
Now that I’ve got my Fit, I’m looking at what it’s going to take to play in H Stock SCCA autoX. I’ve run a few times in SM with my old 87 Daytona (engine, wheels, and brake upgrades), and my 69 Valiant is set up to play in SM as well. Although I’m fairly familiar with Solo II in general, the Stock classes were never a possibility for me until now.
My plans at this point are to upgrade tires to something sticky on the stock 55mm (ugh) offset wheels, and eventually upgrade the shocks/struts at some time down the road. My question is this: what’s the consensus on tire sizing for HS autoX use? I know that typically the goal is to squeeze as much tire on to a wheel as you can fit under the car, unless there’s a clear indicator that the extra tire width just doesn’t work. Is that still the case with the Fit? The two basic scenarios I’m looking at are same-size tires front and rear, or wider tires up front and narrower tires in back. Sizes I’m considering are generally 205/50, 215/50, or 225/50.
If someone has already tried a 225/50 on the stock wheels and found no real benefit, I’ll skip that project. I’m almost certain that they won’t fit in back without spacers, and I’m not sure if ¼” will be enough to keep them from rubbing the shocks. I think they’d be OK in front, and that might help minimize understeer if using a 205 in back.
Any sage advice or experiences welcome…
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Our A/X whizzers here say stay with the stock wheel but put 1/4" spacers on to be legal wider track and better camber and use 195/50x15 or 205/50x15 comp tires, in Hoosier, Kumho,or Falken street comp tires, whatever your local group allows. Don't really know if the better gearing of smaller tires helps so the 205's have been better here. If you find 15" wheels with 49 mm offset you won't need the spacers..
And disconnect the front antisway bar; you'll need to keep the inside front tire on the ground. The Fit goes best with better cornering and that means better rotation and traction. In H everything outaccelerates a Fit regardless so you need every cornering advantage you can get.