The link below is to the one I have its a 10in serrated POLY wheel, Poly wheels seem to be a lil cheaper than rubber. I have never had a rubber one to compare but I haven't had any serious problems with my poly wheel works great. I have the KMG grinder from Beaumont metal works (
http://www.beaumontmetalworks.com/shop/ ) and I have heard of a lot of guys saying the wheels that Beaumont metal works makes are some of the best. But again never had one so I cant compare. not positive but I THINK Beaumont only has smooth wheels not serrated
This is the one I have works great its 10in, but I bet they also have a 8in one if that is what you want take a look
http://usaknifemaker.com/knife-makin...el-70duro.html