29er Asymmetry rims

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29er Asymmetric New Fly Weight Mountain Bike Rims

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29er Asymmetric New Fly Weight Mountain Bike Rims

- Asymmetric design, help to equalize spoke tension.

- Optimized bead seat angle design.

- Ridus support design nipple bed.

- Ultra smooth inner wall.

- 28 spoke holes only.

  • item no.:

    MC932GP-XC
  • product orgin:

    China
  • payment:

    Paypal, Bank transfer
  • color:

    UD/3K(customized painting acceptable)
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  • specification
  • Technology

29er Asymmetric New Fly Weight Moutain Bike Rims


Features:

- Asymmetric design, help to equalize the spoke tension between drive side and non-dirve side of wheels.

- Thick side wall design for better impact resistance.

- Radius support nipple bed design, distribute spoke pull force evenly around each spoke hole.

- Ultra smooth inner wall, for even wall thickness and strength.

- Tubeless Ready, 28 spoke holes only.

- With super light weight (Graphene) version optional.

 -Apply with reinforce for each spoke hole area


Overview of the Fly Weight MTB Rim





Graphene prepreg VS regular prepreg



 Mode MC932GP-XC    MC932-XC  
Cross Section


Terrian Recommended
Cross Country
Cross Country
Material
Toray T800 Toray T800
Weight
310±15g
350±15g
Max Weight Limit
120kg/265lb
120kg/265lb
Sectional Drawing


Width 32mm
* ERD 595mm
Carbon Weave UD

Max Tire Pressure 40psi/2.7bar

Tire Size Recommended 29*2.0''-2.4''


* ERD Calculate
ERD is short for effective rim diameter, it is the maximum distance that spokes bridge going from one end of the rim to another.
How do we calculate the ERD of our rims? Below are calculation equation and sketch for your reference:

 MC932GP-XC ERD calculate

ERD=Rim outer diameter-(rim depth)*2+(Rim nipple bed thickness)*2

For example

ERD of MC932-XC rim=633mm-25mm*2+3.5mm*2=589mm
Most people prefer ERD including the length of the nipple head. 
However, customers may use different nipples and components for building. 
Please add the length of the nipple head (2.5mm~3mm generally) for your spoke calculation. 
If the length of the nipple head is 3mm, then ERD of your MC932-XC rim is 589mm+3mm*2=595mm

A: Rim nipple bed thickness (=3mm)
B: Length of nipple head (2.5mm~3mm generally)



Graphene prepreg helps to improve the strength of carbon rims up to about 20% (if weight unchanged), or reduce 15% weight (keep strength unchanged).

The testing result can be found as following:

Graphene prepreg testing result


Graphene-prepreg-testing-chart


LightCarbon MTB rim has passed UCI 120J impact testing (double of UCI standard 60J !)


The falling mass weight is 17.5kg, and the testing height is 700mm (=overall height 1310mm-610mm initial height). 
So the impact testing energy is 120J. (=17.5*9.8*0.7)



Why Asymmetric Design?


Asymmetric design is becoming a new trend in mountain bike rims.

Wheelsets built with asymmetric rims are of better strength, stiffness and durability.

The main advantage of asymmetric rim is: it helps to equalize the spoke tensions between drive side and 

non-drive side of wheels.

How? Please refer to below illustration:Asymmetric rim VS Symmetric rim

In mountain bike wheelsets with disc brake, the center of rear hub (Point A) is not in the same position of the center of flange (Point B). The center of hub (point A) is closer to the drive-side. During wheel truing, in order to get hub to the center of rim, the spokes are pulled to higher tension on drive side (compared to non-drive side).

Similarly, in MTB front wheel, the center of hub is closer to the disc rotor side (non-drive side), which makes the non-drive side spoke tension higher than drive side.

The spoke tension difference is normally as large as 40%! Such big difference makes the wheelset weaker as it could be. 

As the higher spoke tension side always break easier, while the lower spoke tension side always loose easier.

 

Asymmetry rims are made to solve such issue.

In asymmetric wheels, the bracing angles are improved by make the nipple holes offset to the center.

Thus, the spoke tension between drive side and non-drive side is much more equalized.

Our asymmetric rims are with 2.6~3.5mm offset from the center (a bit different for different width of rim), which helps to improve the spoke tension over 20%.

Therefore, wheelsets build with our asymmetric rims are of better strength, stiffness, and will stay true longer.

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We will reply you within 24h after received your inquiry

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