Re: A little tight but work great
I have the TC40-D, R4's, and bought the chains from Tirechain.com (duo grip) as well as the spring tensioners. I just ordered the little tool that pulls the chains together because I think I can get one more link out).
This is my 2nd snow season with them on. I also am on gravel and have a decent hill that is very icy. They definitely help. But once you get them on, you won't want to take them off as they are a bugger to get on and get tight.
Here is what I find. Make sure that you don't leave any extra links on the back hook. They bang the fender and worse, jam up in your 3-pt hitch if you have a wide implement (as I do, a blade). I looked down the other day to find that one of the chains de-installed itself because that extra link jammed into the 3-pt hitch and completely straightened that back hook! I have since removed the extra link and made a concerted effort to make the implement connection as narrow as possible.
Also, to the person who recommend laying the chain OVER the top of the tire and then driving forward just a little (instead of the old lay the chain out and drive over it technique) is a feakin genious. Makes all the difference when dealing with 100lb chains...it was easier and 1/2 the time as the old method I had been using since I was a kid. You can teach an old dog new tricks!