I want to widen my z250's both about 5 inches. I was looking at spacers and there are alot of different kinds. Since I'm going for about 2.5 inches on each side, what will be the strongest/most durable set to buy (any z400 spacers will do)
I don't want arms and axle, because they dont make them for my bike.

 

high lifter makes some nice aluminum spacers and g-force makes them spacers try here
are the bolt pattens the same as a z400?

 

I would go with the durablue ones. There are plastic, so they are very durable and they wont rust on you.

 

i like the um ones....

 

Yep z400 spacers will fit it fine (i'm running z400 wheels on both bikes)
I wanted to do 2 and a half inches on each side, but I'm worried about wear/tear on the bearings and the rear axle on these bikes is very expensive. You think it'll matter much?

 

yes...you should notice...2 1/2 inches is a huge spacer and i would say all your ball joints and tie rod ends are going to be go a lot faster...also that is a lot more leverage to put on the stock shocks so your most likely going to blow your shocks. Also puts alot of leverage on your a arms so if you land hard, you take a big chance of screwin up your whole front end. I would recommend spacers ONLY on the rear...there is too much to go wrong in the front, but in the back you just get more leverage on the axle, but you probably wont have a problem.