Any car experts/hobbyists?

[Johann]

I'm really thinking I should raise hell and have them replace my tires.

Then do it.

Complain, complain complain -- up the chain, up the chain, up the chain -- until the Company President and all his execs are exhausted and cave, weeping. If necessary, litigate 'em in small claims court until they don't have a tattered pair of skivvies to stand up in. You have a knowledgeable technician's word as backup.

Future customers are depending on you to straighten these people out. Go bravely into battle, good soldier! Right is on your side.

Johann