Come join us for the 2nd annual Diamond Grinder on Green Diamond Resource Company roads outside of Blue Lake. No Pre-Riding, Please. This years course is 27.5 miles long, includes 5,000 ft of climbing, and two Mad River crossings. The ride begins at Mad River Brewery at 10 AM. Click here to download the GPX file or check out the route and profile in the image below the AMAZING poster by Bryan Buswell.