Nuff said....
Theres is 4140 Chrome molly and the Superior one is 4340. 4340's yield strength is nearly double of 4140. But RR are giving lifetime warranty of their product, which to me says that its strong and the likelihood of bending it is minimal.
Price difference is not a lot too. Not sure which way to go...
Yer I kinda need it asap thanks Chris. I will be wearing out my tyres too much....