Hey Bernie,
In another thread I wrote that about a week ago I installed the BroTek spacers also. The price listed is $260, but if bought in combo with another item they are cheaper. I bought the ripper tooth also and Richard charged me $220 for the spacers.
The spacers are machined and very light, so they don't add extra weight to the axle. They space the tires to the outside about 2 inches each side, for a total of about 4 inches in stance. Doesn't sound like a whole lot, but it does make a noticable difference in stability.
I also am no engineer, but my feelings are that they do not stress the axle in any great way. I would think adding wheel weights would do this more and my dealer installed weights when I bought my
BX23. That said, I have noticed that my rear bar tires seem to dig up a little more when turning. I am not sure if I just notice more because the tire sticks out more or if the extra stance makes the wheel turn at a different rate. In any case, it seems a small concession for the extra stability. On the visual aspect, I think they look great and make the tractor look beefier.
Larry