Ideal Carbon Rims For E-MTB Wheels Aug 18, 2021

E-Mountain bikes are getting increasing popular during recent years. With motor and battery added, e-bikes are always heavier than regular bikes.

Supported by extra e-powers, more riders tend to ride more aggressively (further, higher and faster). All these features of e-bikes add significant workload on the wheels, especially carbon wheels for E-MTB.

To make sure our carbon rims strong, stiff and durable enough for E-MTB, we have developed the reinforced version of MTB carbon rims AD938-EN which is suitable for E-MTB and aggressive enduro bike.

AD938-EN is with asymmetric design (3mm offset), 29er, 38mm outer (31mm inner) width and 28mm height.

PAD938-EN ebike carbon rims for e-mtb wheel

Asymmetric design is helpful to build wheelset with more even spoke tension (between drive side and non-drive side), which makes the wheelset of better stability, stiffness and durability.

It is tubeless ready, and optimal for 29*2.3''-2.8'' tire.

As it can be seen in below table, the EN version is 40g heavier than regular AM version. By adding extra layer on the rim with optimized lay-up design, the strength and impact resistance are improved by 20%.

AD938-EN will be your good company for a longer distance adventure.


The detail of ProX MTB carbon rims UCI impact testing standard can be found in below table.

ProX MTB Carbon Rim UCI Impact Test
Test Condition:
1. Falling mass: cylinder shape, weight 22.5kg, with solid rubber pad on the contact surface.
(rubber pad should be in good condition, 10mm thickness, Shore hardness A=50+/-5).
2. Fix built wheel (with no tire) on UCI impact testing machine.
3. Raise the falling mass to specific height from rim surface. (to reach different impact energy)
4. Release the mass, free fall to the rim (the position between two spoke holes).
5. Testing starts from height 272mm (60J), then to 317mm (70J)....until 544mm (120J).
6. Each height test for 2 times, and there should be no any crack or damage on the rim.
Impact Energy (Joule) 48J 60J 70J 80J 90J 100J 110J 120J 130J 140J
Testing Height (mm) 217 272 317 363 408 454 499 544 590 635
XC-GP OK OK OK OK
XC OK OK OK OK
TR OK OK OK OK OK
AM OK OK OK OK OK OK
EN OK OK OK OK OK OK OK OK
DH OK OK OK OK OK OK OK OK OK


The following video shows the testing of our MTB carbon rim PAD938-EN, which has passed 120J impact testing, without any damage.


ProX E-mountain bike carbon wheels built with AD938-EN carbon rims.

DT240 MTB Boost E-bike Carbon Wheel
DT350 MTB Boost E-bike Carbon Wheel


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