DT Swiss retrofit kit front wheel hub 240s OS 15mm thru bolt 240s oversize 15 mm TA front Contains end pieces to convert into thru axle Fits Wheels EXC 1550, EX 1750,FR 2050 240s thru bolt rear Fits Wheels XRC 1350 XR / X wheels XM / M wheels EXC / EX / E wheels FR To convert into thru bolt (135 mm /10 mm) Fits Wheels XRC 1350 XR 1450