I was basing my point on multiple reports/reviews of ultra light wheelsets giving negative performance and resulting in effects as I listed such as poor grip and skipping on rough surfaces.
Please provide references. Genuinely, please provide references. We'll wait.
No offense, but you are relatively new here, and there are wheelsets being used daily which are near 900g for the set without nary a word of "too light" or "losing grip."
Per your signature, it appears your current lightest ride is on target for "7kg", so I must ask you: have you ever ridden a setup that tilted the scales at less than 5kg? Did you find that you lost grip?
Very basic physics will also tell you that a rotating part which is 'too light' will also be unable to maintain a rotation for as long under certain operational conditions.
You still aren't doing the math, and physics theories are described in vacuums but in reality we do not live in one. On the track there is a preference for heavier wheels because they will retain greater momentum going forward compared to a light wheelset. The track surface is also mostly smooth, there is no climbing (no matter how steep the banked track is, that is not a climb) and it's pretty much just straight with two transitional left turns. On the road, heavier wheelsets might have an advantage depending on the terrain/route, but lighter wheelsets are not fledgling in their "loss of grip" and they too carry an advantage depending on the terrain route. But, Alex, your argument is that the wheelsets can be too light... despite the weight difference being a very small fraction of the total system weight.
Please, indulge us: what are these "certain operational conditions" where a light wheelset will lose grip?
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