one60 wrote: ↑Sat Aug 22, 2020 7:20 am
would appreciate more input/feedback on the (rim) braking performance of these wheels. Also interested whether changing to a swiss stop or Campagnolo red pad offered any improvement in braking.
I got your email and will reply some of your qns here, let me know if theres anything else in particular you would like to know.
I have both rim and disc versions, unfortunately I do not believe we can feel actual differences in ride quality between different wheels if blinded so I would rather rely on controlled testing. I have only experiened 1 wheel which was not laterally stiff enough but that was a 1100g climbing wheel which would rub on the rim brakes under power.
someone talked about windup which is torsional stiffness, i have tested simply my disc hypers vs a zipp 404 fc. the 404s were about twice as torsionally stiff when rotating the wheel with the brakes are applied and i attribute this to it being the spokes are crossed on boths sides vs it being radial on the disc side for the hypers. I don't have an easy way to test torsional stiffness from the driveside so I can't say which is stiffer under power. I do believe the hypers are more than stiff enough for braking so it shouldnt matter.
as for radial stiffness, I think this is what people think affects ride quality the most but again, I believe all decent wheels are at a level of stiffness where it is imperceptible to a blinded human. The tyre flexes way more anyway. If im not wrong the UD carbon should have about the same modulus of steel so the difference would have to come from the greater cross sectional area. While the hypers do have larger spokes, if I compare them to the zipp404s, they also have fewer spokes. The other aspect of radial stiffness would be the rim depth so all in all i don't see the hypers as being significantly stiffer than a regular deep wheel with a normal number of steel spokes, and even if it was I highly doubt a human could tell if blinded.
I have no problems braking on the rims, even in the wet. When wet you just need to know they just take a little longer to bite. I use lifeline blue pads they are fine.
I have 1 issue with the wheels (besides the fact that they are def not the most aero as claimed by hambini), they creak under power. both my wheels creak. I suspect it comes from the spokes rubbing each other, when i grab the crossed spokes i can get them to make a similar creak. I have not confirmed this yet, but when it rained on my last ride they stopped creaking (or i couldnt hear them thru the rain haha). ill lube them before my next ride and see if it stops.
all in all if the creak is easily remedied i think they are great wheels for the money if you are not crazy about every last aero watt. They saved 400g off the zipp404s disc and 300g off my yeoleo 60mm rimbrake wheels (bitex hubs + cx-rays).