Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of wheel and tire manufacturer Titan International (NYSE: TWI) rolled up a 12.6% gain on heavy trading with a couple of conspicuous volume spikes.

So what: Titan itself didn't say much today, but the company also makes farm-equipment tires sold under the Goodyear Tire & Rubber (NYSE: GT) Goodyear Farm brand. That partner is up more than 5% today after CFO Darren Wells spoke at an investor conference today to talk up the positive trends in the tire market.

Now what: Besides Goodyear tooting the industry's horn, commercial machinery stocks are up all over the place today, including a 13% gain for perennially troubled Dana Holding (NYSE: DAN) and a 5% boost for everybody's favorite customer, Caterpillar (NYSE: CAT). It all amounts to a sigh of relief that the sky might not fall after all. However, every stock mentioned is still down by at least 20% over the past month, so there are still plenty of bargains to be enjoyed in this sector.

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