[Premium Down Hill] Asymmetric 27.5" Mountain Bicycle Carbon Rim 39mm 530g

  • Unit Price: 269 USD

  • Price in reward points: 26900


In 2016, it was the first time we designed the Downhill special bicycle rims with full Toray T700 carbon fibers. To make it strong enough, the depth was designed to 32mm and thickness to 4.5mm. The test result of positive stiffness reaches an astonishing 150J. Over the years, it has won the unanimous favor of DH riders, which leadsed to the result that this series has become a DH classic product.

With the continuous innovation and changes in the carbon fiber DH wheel market, DH riders have higher requirements for the weight and the riding comfort of Downhill rims. Therefore, in 2020 we designed an asymmetric DH rim series (XD39), the 29" NXT29XD39 and 27.5" NXT27XD39 models. The asymmetric design is conducive to balancing the spoke tension on the driving side and non-driving side of the wheelset, making the ride more stable. A mixture of T700+T800 carbon fiber materials is used to increase strength and reduce weight At the same time, the layer-up technology process has been improved, the depth of the rim can be reduced to 25mm. The shallower rim depth is beneficial to increase the toughness of the rim, and it will become more comfortable to ride. The positive stiffness test on the XD39 series has reached 160J, stronger than the previous generation.

The weight of model NXT27XD39 is 520g. The video of Positive Stiffness Test: VIDEO LINK

The profile drawing of this rim is as below. 

Carbon Fiber Mountain Bicycle Rims for Down hill DH Free Ride 27.5 inch 650b

This rim could be used for AM (All Mountain), Enduro, Freeride, DH (Down Hill) riding. The tire size for this model of rim is recommended at 2.1" ~ 2.8". The tire pressure is recommended at 30 ~ 70 psi. 

What's in the Box

Carbon Rim(s)


Learn more

What is the difference between weaves UD, 3K and 12K?

What is Free Coating Manufacturing (FCM) process?

What is the Difference between Ultralight, Premium and Standard Edition?

What is ERD (Effective Rim Diameter)?

How much spoke tension should I use?


  • Code: NXT27XD39
  • Rim Type: Mountain Bike DH (Clincher, Hookless)
  • Materials: Toray T800 + T700 Carbon Fiber (Premium)
  • Tubeless Compatible: Yes
  • Drillings: 28, 32
  • Warranty: 3 Years


  • Size: 27.5" / 650B
  • BSD (Bead Seated Diameter): 584mm
  • ERD (Effective Rim Diameter): 553mm
  • External Width: 38.6mm
  • Internal Width: 30mm
  • Rim Height: 25mm
  • Weight: 520g
  • Valve Hole Diameter: 6.5mm (Presta)
  • Spoke Holes Diameter: 4.5mm
  • Spoke Holes Angle: ± 6°
  • Spoke Holes Offset: 2.6mm
  • Assembly Hole Diameter: 7.5mm


  • Spoke Tension: 80~130kgf
  • Tire Size: 2.1" ~ 2.8"
  • Tire Pressure: 30 ~ 70psi
  • Load Limit (One Wheel): 150kg


  • Carbon Weave Availability: UD / 3K / 12K
  • Finish: Free Coating / Matte / Glossy


  • application: AM / Enduro / Freeride / Down Hill

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