BMW S 1000 RR 10-18 S1000 RR HP4 12-14 AS3 TOP YOKE STEERING STEM NUT RED. BMW S 1000 RR, S 1000 RR HP4. 2012-2014 BMW S 1000 RR HP4. AS3 Performance Top Yoke Steering Stem Nut for. AS3 Performance stem nuts are manufactured from 7075 T6 aluminium and are a great upgrade from the OEM stem nuts, they weigh only 21 grams and have an anodized finish to match the rest of our range of CNC machined hard parts.
