E-MTB Tech

S-Flow Profile

The unique combination of a stepped sidewall and flowy profile gives carbon rims great vertical compliance. With this unique design, key areas of the rim are carefully reinforced so that rim weight can be reduced without compromising durability.

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Dual-ERD®

The curved inner circumference creates peaks and valleys. By lacing the spokes of lower tensions to the valleys, the bracing angle decreases, and the gap in bracing angles between the high-tension and the low-tension sides shrinks. This allows for more even spoke tensions and a wheel that stays true longer.

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Hybrid Hooks

Between hooked and hookless profiles, there is a new option: the hybrid hook. Carefully engineered semi-ridges blend the advantages of traditional hook shapes for excellent tire retention, good rubber/rim engagement, and easy setup.

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Wide Rim Bead

Our E-MTB rims feature 4mm ultra-wide rim beads. The thickened bead, along with the smooth edge, offers fantastic protection for when tires meet obstacles, as the impact energy gets dispersed faster on broader surfaces. This lowers the risk of snakebite punctures.

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Reinforced Freehub System

We only build our E-MTB wheels with premium components capable of withstanding the higher loads demanded by modern electronic engines. Hubs by DT Swiss and Industry 9 are two popular options found on many of our E-MTB-specific builds.

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Paintless BlackTek

Paintless rims represent a manufacturing upgrade in every way, from the raw materials used to layup and mold precision. Paintless carbon rims come out of the mold with a flawless appearance and without the need for post-production treatments like sanding and paint. The innate rim finish is highly wear-resistant.

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E-MTB Wheel Testing

Both the EH733S and EH935S have passed through a series of destructive and non-destructive tests in their development stages. Below we’ve highlighted some testing data most relevant to ride experience out on the trail.

01 Mold Precision Test >

The first step in testing a new rim is ensuring the mold meets the correct dimensions and trueness of the initial product design. We make the first rim using an all-new mold and then inspect the product sample to determine the precision of the mold.

Mold Precision Test Report
Model: EH733S-27.5		Test Date: 2023/07
Name	Standard	Result	Conclusion
Inner Width	33.0+/-0.3	32.84-33.24	PASS
Outer Width	41.0+/-0.3	40.9	PASS
Outer Diameter	594.5+/-0.6	594.52	PASS
Bead Seat Diameter	584.1+/-0.6	584.12	PASS
Peak Depth	26.8+/-0.3	26.74	PASS
Valley Depth	22.1+/-0.3	21.98	PASS
Center Channel Depth	8.5+0.5/-0.3	8.76-8.92	PASS
Flatness	≤0.4mm	0.16	PASS
Roundness	≤0.4mm	0.22	PASS

02 Stiffness Test >

Lateral or vertical stiffness is how well a rim resists flexing and deforming when a given load is applied. This predicts how the product performs in sprints and on rough, chunky terrain. During testing, a rim sample is fixed in the rig with an increasing load applied to a preset limit, and the flex is recorded automatically.

Stiffness Test Report
Model: EH733S-27.5		Test Date: 2023/07
Vertical Stiffness	Compression item	Stainless steel cylinder
	Moving speed	0.4mm/s
	Flex	3.4mm
	Max load	50kgf
Lateral Stiffness	Compression item	Stainless steel cylinder
	Moving speed	0.4mm/s
	Flex	2.6mm
	Max load	25kgf

03 Impact Resistance >
An impact resistance test shows the overall structural performance of the wheels. Our impact test is performed on wheels without tires mounted. Eliminating the tire as a variable gives a cleaner results and can mimic bottoming out the rim on various trail obstacles. Our E-MTB-rated wheel must pass an impact energy of 150J, which means no cracking or lateral/radial run-outs over 0.5mm.
Impact Resistance Test Report
Model: EH733S-27.5			Test Date: 2023/07
Energy Level			Starting level: 120 joules Usability level: 150 joules (5J increment per round)
Raised Height (cm)	Height Increment (cm)	Energy (J)	Test Points
			#1	#2	#3	#4
92.32	51.02	120	PASS	PASS	PASS	PASS
94.44	53.14	125	PASS	PASS	PASS	PASS
96.57	55.27	130	PASS	PASS	PASS	PASS
98.7	57.4	135	PASS	PASS	PASS	PASS
100.82	59.52	140	PASS	PASS	PASS	PASS
102.95	61.65	145	PASS	PASS	PASS	PASS
105.08	63.78	150	PASS	PASS	PASS	PASS
107.2	65.9	155	PASS	PASS	Failed	Failed
04 Wheel Building & Tire Mounting >
A rim may look perfect at a glance but can build up poorly if important details are ignored. In this test, a rim is built to a DT 350 boost hub to inspect the wheel-building friendliness, and is then mounted with a 27.5” mtb tire to guarantee tire seating safety.
Wheel Building & Tire Installation Test Report
Model: EH733S-27.5		Date: 2023/08
Name	Standard	Result	Conclusion
Wheel Roundness	0-0.4mm	0.25mm	PASS
Wheel Flatness	0-0.4mm	0.21mm	PASS
Spoke Tension	115-125kgf	At 115-125kgf, no visual deformation or crack around the holes.	PASS
Dynamic Speed Balance	≤3g	2.58g	PASS
Spoke Hole Angle	The holes must align with the spoke angle.	Aligned.	PASS
Tire Mounting	Easy tire mounting. The tire must seat securely on the wheel at 50psi.	Tires mounted easily by hand. No tire burping at 50 psi.	PASS