Which chainguard (or alternative chainring) for a Shimano FC-M 510 crankset
Many thanks for all the tips. I ended up buying a new FC-M540 chainring with holes (since my current one was already quite old) and a chainguard that is actually meant for FC-T671/FC-T781 (Y-1MP98070). Needless to say that the chainguard fits perfectly to the FC-M540 chainring, although officially they are listed as incompatible.
Everything works perfectly, I didn't even have to adjust the front derailleur.