42t Sprocket Weights for Vitpilen 701, Svartpilen 701, and Duke 690

Sofauxboho

contributing rider
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Jul 19, 2021
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San Francisco, CA
Frustrated that everyone claims to be "the lightest" without publishing actual weights, I purchased several of the main sprocket options for the 701/690 in the popular 42 tooth size and weighed them myself.

Results:
Stock 2018 Vitpilen 701 steel 40t: 1.084 lbs
OEM KTM steel 42t (part 75010051042), $68.01: 1.306 lbs
Dirt Tricks skeletonized steel 42t, $117.75: 1.074 lbs
SuperSprox hybrid aluminum / steel 42t, $89.96: 1.352 lbs
Sunline all aluminum 42t, $14.99: 0.638 lbs

Album with pictures of all sprockets on the same scale, one at a time:
(Note that the scale was zeroed each time. In the photos with a paper towel under the sprocket it was zeroed with the paper towel on and no sprocket, then the sprocket was added in order to tare the weight of the paper towel. All shown readings are the weight of the sprocket alone.)

Results:
The SuperSprox hybrid sprocket is shockingly heavy and in no way worth the significant cost.
The OEM KTM 42t steel sprocket weighs less than the SuperSprox at about 2/3rds of the cost. However, the original 40t sprocket is much lighter. Adding two teeth (5%) adds 30% to the weight!
An all-aluminum sprocket is cheap and weighs half what the other options do, but this isn't really an option for anyone who racks up a reasonable number of miles. And it only saves half a pound.
If you aren't cost sensitive the Dirt Tricks sprocket may be your best bet. It isn't lighter than stock, but it at least lets you move to 42t gearing without gaining weight or losing durability. Otherwise the KTM OEM sprocket is a good way to go. It's also black, which is nice.

I went with the Dirt Tricks sprocket, myself. Though I'm still tempted to try the all-aluminum sprocket and see how long it lasts.
 
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Sofauxboho

Sofauxboho

contributing rider
Joined
Jul 19, 2021
Messages
20
Location
San Francisco, CA
Interesting! I’ve kinda blown my wad buying and weighing these sprockets, but if someone is willing to document chain weights I for one would love to see the results.

We clearly can’t count on manufacturers’ claims!
 

BISavage

pro rider
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Oct 8, 2020
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Unspoken Origins
I have had a few different ones on my 401, and I jotted down the weights for comparison... the DID vx3 should be the right strength for a 701, the lighter mx ones are only rated to like 70hp max so im not sure how well they would hold:

• 1704g - 112 DID VX3 (x-ring)
• 1747g - 114 DID VX3 (x-ring)
• 1858g - 114 CZ ORM (o-ring)
• 1914g - 118 CZ ORM (o-ring)
• 1915g - 118 Esjot HCR (non-sealed)
• 1598g - 114 RK MXU (uw-ring)
• 1544g - 112 RK MXZ4 (non-sealed)
 

BISavage

pro rider
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Oct 8, 2020
Messages
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Location
Unspoken Origins
After writing the post, I was wondering myself if the 70hp (off road racing) rated MXU would hold on a 701 without snapping...

It will probably wear a bit faster than the normal 700cc / 150hp rated chains, but it does have a very high tensile strength.
 
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