Light. Strong. Cheap. You can still only pick two, but lightweight wheels don't get any stronger than the Enve M60Forty 27.5" DT XD1 Wheelset, based around Enve's innovative new M-rim. Coming in at under 1500 grams, the 27.5" M60Forty DT XD1 is ready to challenge for gold at short track XC races, although it's reliable enough for railing your favorite rock garden.
Each M-Rim model is optimized and designated for specific riding styles, loosely indicated by the amount of time spent (or importance placed on) descending vs. climbing. In this case 60Forty represents the typical trail rider, and is placed between the XC race 50Fifty and freeride-ish 70Thirty models. If you are a descender who likes to hammer or a climber who knows how to get it on during descents, the M60Forty is your rim. Across the M line-up, carbon lay-ups, rim widths, and hole counts vary to best exploit the wheel's performance for it's intended application. Bead hooks will not be found anywhere, however, as today's precision tire manufacturing processes and better rim design ensure a secure interface between tire and rim. Eliminating the bead hook obviously saves weight, but also allows greater impact resistance. Further, each M model rim is specifically tuned to provide a balance between vertical compliance and stiffness appropriate to it's intended use. Rest assured, however, these rims are plenty stiff, and will provide unbelievable steering accuracy and maximize deflection resistance, while still doing their part to reduce rider fatigue as much as possible.
Interestingly, M-Rims share much of the same DNA with their SES-series road rims. During the research and development of the road rims, Enve discovered that their design provided more strength than the current series of mountain rims. Armed with this new data, Enve's engineers were able to create an MTB rim that was both lighter and more resilient than anything that has come before in the M-rim.