On the clearance issue, what pressure do you keep your tires? I'm wondering if having them a bit overinflated would be better or worse for clearance...
Depending on the forecast at the time, I'm planning on increasing the cold inflation pressure beforehand to adjust for the fact that 10 degrees F approximately equates to 1 PSI. (I'm not interested in adjusting in freezing cold, if it is very cold there at that time.) I am currently following the 38 PSI manufacturer spec. using an Accutire digital gauge, actually I inflate to 38.5 and wait until all 4 go down to 37.5 before going back to 38.5, but all 4 always set at 38.0 minimum. Every two weeks I check. With about 20,500 miles I don't notice any uneven wear. These tires definitely have a long tread life.
So I had a chance to open the K-Summit box right now in the middle of the night, and I thought I'd give some initial impressions. I didn't get around to it yesterday morning like I hoped. My wife goes to work Thurs. so I'm not sure I'll get to test fit before she leaves:
1. These things are HEAVY, well, at least for me. I'm not that strong, but they are definitely much heavier than the SZ137s, probably double, if not more. I can lift both SZ137 cables with one hand with no problem, but with both hands I think I'll need some effort just to carry around one of these.
2. Definitely set these up before you go anywhere you might need them. The SZ137s don't require any special setup in comparison.
I'll try to explain a little: (If you need more details go to the Thule website. You can use the Fit Guide to select the specific Snow Chains for your car/vehicle, and there is a tab where you can download the instructions, but actually the instructions cover the whole line of K-Summits, including the XL and XXL.)
The reason it fits so many tire sizes as compared to the SCC units is that it has these pins with a little yellow spacer inserted, I believe 4, which effectively decreases the outer radius. For the Prius v with 215/50-17 tires one has to use the SCC SZ133s, whereas for Thule, the K33 fits both. So for the 215/50-17 tires, I would not remove any of these pins, whereas for the 225/50-17 tires on the C-MAX, I am supposed to remove 4, which effectively increases the diameter of the the chain/cable. I was originally going to try them on the Prius v first as they are setup size wise exactly for that, but I think I'm just going to skip the hassle and go straight to removing the 4 pins. The pins work by pinching the cable in parts, so inserted the cable looks like X, and removed the cable looks like I I. When in the parallel configuration, the chain is longer....
There was another concern, as these require an attachment to one lug nut/bolt. As there are varying sizes of nuts/bolts, the instructions show that some adapters, in this case 19mm, 21mm, and 22mm, might not be included in the kit. I think Amazon lists 17mm and 19mm included, but 21 mm and 22 mm are not. In the hard copy manual that came in the case, it lists 17mm and Optional for 19mm, 21mm, and 22mm. The good news is that AutoAnything drop shipped direct from Thule USA, and the package came with ALL 4 sizes. (YAH! I don't have to go searching on where to buy the adapter I need!) I guess for the Sweeds, (as Thule is a Sweedish brand,) optional doesn't mean not included and you have to pay extra, like so many other companies do. Everything is Awesome.
The device that attaches to the bolt/nut will not work on a wheel lock, but you don't need to remove the wheel locks on your vehicle so long as you have one regular bolt/nut to attach to. (Gorrilla Automotive sells "The System" in which every nut/bolt is a lock. It wouldn't work on that.) Now this "device", which basically looks like a pointer, requires a specific amount of space when inserted into the lug hole. Included is an extra red spacer, in case it doesn't have the right clearance from the face of the wheel. One spacer is already installed along with the 17mm adapter on the medium size bolt. You use a different combination of the spacers, along with the included longer and shorter bolts, to adjust the clearance from the face of the wheel.
Enough for now. I need to get some more sleep.....
Edited by jzchen, 15 November 2014 - 03:39 AM.