i just put on my sp1s today, mine were from japan and they dont come hubcentric. the ppl at acutech tireshop told me that i dont need center rings for it. i just wanted my fellow s2k members to answer this for me instead. does any one know?....cuz it seems my rear wheels are slanting inwards when i look at the bottom. and that seems like it will wear out my tread faster. is not having center rings the reason its like that?????

 

the tilting of your wheels is from your alignment settings - perfectly normal.

As far as hubcentric rings go - some people recommend them, some say not required - however its the only way to guarantee that the wheels are centred on the hub.