Involvement:Expert (understands the inner workings) - Ownership:less than 1 day
I purchased three pairs. the weight for the each pair with springs is 48.8g, 48.8g and 49.4g on my scale. Not bad at all. the maximum effective length (inner to inner) is 124mm for the front and 153mm for the rear. I'm not sure about their material, but at least axle, lever, washer and nut are not steel.
two pairs are not bad. but the other pair's threads are not smooth. the springs are steel, that means, not light. I think these springs are not necessary and if you do not use them, you can reduce about 2.2g.
TENSION TEST REPORT on the package, but I have no idea about it.
buy them if you want 49g red quick release. but you can find much lighter skewers elsewhere.
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