OK, so a few days and a hundred readers and no takers. Apparently all of you 4100 with Turf owners took your dealer seriously when he told you John Deere didn't make chains for the turfs. I found it incredible and looked elsewhere. TSC to the rescue again! I asked for a set of low-profile chains, because of the closeness of the fender and footrest. They called Peerless Chain Co. in Winona Minnesota, and obtained for me a set of truck tire chains. They use about 1/4" twisted links for the cross link sets (4-link spacing), and lay real nice on the tire. They were too long, but that is a simple problem. Cost me $75 for the rear set, plus sales tax. They are on and fit like a glove, and they work great! In case you need to know, they are "Superior" truck tire chains, # 0323510, fitting a whole list of truck tire sizes beginning with 35x12.5-15LT..., type DH, 4 link.