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How hard is the polyurethane?
I've heard the bushes flog out very quickly if they're too hard, hence the nolathane ones are crap for 4by's.
Do you guys do rubber ones? I see you can buy rubber castor correction bushes these days but I have no idea of the quality....or longevity......but the theory would be that the "should" be better than other options.
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Nolathene is a brand of polyurethane, but is generally harder than the polyurethane that we use in our bushes. Our bushes are like this:
http://i1278.photobucket.com/albums/...ps4794efb3.jpg
The polyurethane holds the bush in place better than a rubber one would (less flex and movement), and due to what the bush is holding, it doesn't need as much torsional flex as other bushes (which is where the rubber bushes are superior). We don't have issues with them (and have them installed in a number of our own company vehicles). But if you ever did, our warranty is there to back them up.
Let me know if you have any questions.
Cheers,
Matt
Ironman 4x4