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I'd like to install a chainguard like this:
on a bicycle that's will be spend it fair amount of time commuting, but on closer inspection I see that the largest chainring doesn't have the necessary screw holes, to my surprise (naively enough I assumed this would be "standard").
Also, since this a Hollowtech crankset, using something like this seems to be out of the question as well:
Is there a way to attach a chainguard to a bike like this, without having to resort to a full-size chainguard?
The obvious mounting points for a chainguard are the chainring-spider bolts.
There are many 'bash guards' available that mount like an extra chainring that are intended to protect the chainring teeth, but would probably do just a good a job of keeping pant legs away.
Most are designed for small MTB chairings but larger ones seem to exist with road -bike BCDs. Try googling '50 tooth chainring bashguard'.
Instead of trying to modify your chainrings, just tuck your trouser leg into your sock or use clips, velcro bands velcro bands or any of the other similar products on the market. They're cheap, effective and often high-viz and/or reflective.
