It's a look all to it's own, thats for sure, took me ages to work out what i was looking at, till i spited the edge of the peice of wire in the tread.
Seems a fair bit of effort to carve up what looks to be an old ride on or small car tire, and lock it on so well with what might be a coat hanger.
Its not something i like to se on such a classic, but for a newer model maybe...
...I am currently working on a 'Super-Frankenstein' mower, its got the late base from a series 80 side throw, with cut-outs for larger wheels, a home made chute and height ajuster, parts of about 3 engines, and the wrong handles, these 'tires' might just be the finishing touch!