Rolf prima rolf front bearing kitthe rolf prima front bearing kit includes two highly durable and incredibly smooth enduro 2rs sealed cartridge bearings perfect for servicing your rolf prima front hub features enduro 6801 2rs sealed cartridge bearings suits the following front hubs tdf3 4 tdf4 4 tdf5 5 tdf6 0 xst xst tandem tandem discbuyrolf prima wheels tyresfrom chain reaction cycles the worlds largest online bike store