www.konig.it check out the chain sizing guide for starters
ill try not to go on for too long about this.
ive got a set of the T2 magics that pretension when u drive away.... i get greasies when i rock up, have chains fitted and drive away when some people are still tryin to get the first chain on (205-65-R15)
**ok well main thing to consider with chains is that u have the clearence to fit them, that is from any part of the vehicle - suspension, brake lines and the wheel archs. another thing the lower the rear end, the harder it can be to your arms round the back of the wheel to connect the inside hoop, IMHO if u got expencive wheels get yaself lined up with the best set of chains availible to u - less likely to damage the rim surface and diamond pattern chain over ladder as u get better traction than the outdated ladder pattern chain
when u recieve them have a few test fits- **doesnt mean driving them on dry roads as u will stuff them** keep in mind wont prepair u for when ya have to fit them for use, be sure to be ready for cold air, slopping snow from gaurds, mud and debris-cause u can get caught out n have to fit outside a prepaired fitting bay
few other things i like to highlight high vis clothing and use of hazard lights are good tools when caught out in blizzard conditions on the side of the road,
well hope these pointers may make your journey a bit more safer this winter!
cheers, Bryan