Piston Slap: Si or No to 'Minus 1' Tire Sizing?

TTAC Commentator 70Cougar writes:

Sajeev,

I am probably the first owner of a Civic Si to ever want to downsize his rims, so I’m looking to the expert on -1 matters: you. (Woot! –SM)

I have a 2007 Honda Civic Si sedan with the factory 17-inch wheels. I’ve always preferred the same generation EX’s 16-inch five spoke rims, and I wouldn’t mind a smoother ride and cheaper replacement tires if I still get decent handling performance out of the 16s.

Would the 16-inch rims fit around the brakes on the Si and otherwise safely function on my car? Would there be a significant decline in handling performance?

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Piston Slap: Mazda's Rust and Tire Size Trust Gap?

Curb Appeal? (photo courtesy: Greg)

Greg writes:

Hello Sajeev, David Holzman says I should write to you about my Mazda concerns.

1. Concern #1. In two out of three dealers there was significant rust at the center of the wheels due to the wheel caps not having been put on. I only took three pictures, but essentially: at New Country Mazda in Saratoga Springs NY 100% of the Mazdas had no wheelcaps on in the lot and were all showing various degrees of rust. That includes the one in the showroom, you can see it in the pic with the tile floor.

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