wheel spacer

Bike is a 2012 Yamaha WR450 currently at the motorcycle mechanic waiting to mount supermoto wheels along with several other bits and pieces. According to the mechanic the front and rear stock spacers won't work. I wheels I have are 17" STS tubeless Alpina wheels mounted to what I believe are...

Hey guys, I know there are a few of you out there with a 250x and warp 9 17 inch wheels. I am doing my bike right now but I am having dificulty tacking down what front wheel spacers I need. I know i cant use the odo anymore and need the R spacers. Does anyone have a recommendation on what...