I've posted a similar question in alt.autos.subaru, but I'm looking for other experiences or tips.
The car is a 2004 Subaru Impreza WRX with four almost new all- season tires (Bridegstone Potenza RE960AS). I've tried driving it in the Sierras with Pirelli P Zero Nero M+S, which I didn't think was that great in snow.
At least in California, the AWD with M+S tires is enough to get me waved through R2 chain checkpoints. However - I realize there might be conditions where I still need to get out and put on the chains if there's substantial ice. I've tried installing the chains I've got (Cobra cable chains from Quality Chain) in my garage. They attach via a series of bushings that are fitted into a keyhole end hook. The instructions state that it should be done with the car parked, although it may be jacked up with adequate safety measures (blocking the rear wheels).
So each cable attachment point has 8 bushings. I could get them to the 6th bushing on the inside and outside with these new tires. At that point there was still quite a bit of slack and the cables seemed a bit sloppy. I tried getting the outside cable to the 7th bushing but couldn't. The instructions said to drive the car one length ahead (I didn't try) and retighten. I suppose they may be easier to retighten at that point. There are also some rubber adjusters available to take up the slack. I'm not sure where to find them, but they seem like a good way to make sure the chains are secure w/o overtightening the side cable. They also have a crappy keyhole clip that's supposed to retain the excess side cable. They don't seem too secure, so I might just use velcro ties.
I've looked up other instructions and seen different instructions for ladder-type chains/cable chains, including:
- Turning the wheels in one direction to make it easier to reach the connector on the inside of the tire.
- Attaching the chains on loosely, then drive one foot so that the attachment points are vertically at about axle level. Then tighten.
- Using a jack.
- Lay out the chain in front of the car and drive over it so the attachment points are near the top or axle.
I know I can pay a licensed installer, but I can imagine being in a situation where I need chains and there aren't any installers. I'm also curious as to whether it might be a good idea to get another set. The owner's manual says that chains go on the front, but I've heard many indications that an AWD vehicle with chains only on the front might be more likely to spin out if the rear tires lose traction.