I have a bashguard on a Specialites TA 52/42/26T triple but that used to be a tandem-specific item and is only possible because the 50.4mm BCD is really flexible in mixing and matching parts.




You could also check out some of the older French chainguards on French eBay. This is a 45T ring with bashguard and it still has plenty of room for a bigger ring I think.