You will be going up lookout mountain. That is a beast of a climb. That is probably the only time you will be on the 28.

I would actually like to see some quantification of something like this, and brake rub for that matter. With that being said, it is already on your mind. While it may be more aero when working probably, the mental energy going into it is probably not worth it.

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Maybe you could adjust your L screw a tad to clear up the rub?

I'd run the cover if it really is slight and ONLY on 28 if you can't get to not rub. If you're 2x you've got a bunch of choices.

No, can't be adjusted not to rub. Two different mechanics have tried. Yes it's very slight and only in 28. Yes running 2x. I'm leaning towards running it especially since looks like gonna have some wind Sunday.

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Let food be thy medicine...

Make sure your RD hanger is straight,if not that could be the cause of the rub on the cover.
It is very possible even with a straight hanger it may rub,I saw this happen before.

I have had athletes with this issue, since limit screw was no help you can try taping the the backside of wheel cover to the spokes to "suck" it in just a touch. Gorilla tape seems to hold pretty well for this.

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^^^This. Taping the drive side to the spokes with duct tape fixed the slight rub that I had.

You really shouldn't be in your 28T cog unless your running massive chain rings. Even if your little ring is a 39 (which I'm sure yours is a 36) you'd be fine.

Also, why put a cover on a 404? You're covering the wheel so you may as well just use lighter shallower training wheels.

Taping it worked like a charm. Hopefully it will hold.

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Let food be thy medicine...

I took mine off for tmrw due to same problem even with taping DS spokes. Fiance's bike was fine today as it seems to fit better than mine does.

Because the cover weighs more than the carbon used to make the wheel. This is anecdotal, so sorry if I'm wrong, but I've heard a covered Flo 90 is lighter than a covered Flo 60 for this reason. Not sure if it's exactly the same but in the end I doubt you really save anything significant.

Tape held, no rub. I have a lightweight Raltech carbon cover on my 404. I imagine that combo weighs less than a disc.

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Let food be thy medicine...

You are only losing watts when you are coasting...and you shouldn't be coasting in your 28.