The website clearly says:
The Road Plus Size Full Metal Fenders will fit road bikes with 700x30 tires maximum.
However, my experience with another mudguard brand (not sure anymore, I think SKS) was that the specifications were conservative and I could fit slightly larger tyres without an issue.
Does anybody know if PDW Full Metal Fenders 700 x 37 would fit a 700 x 32c tyre (on a Merida Speeder 200, if that matters)?
I don't have a bike shop nearby that sells these, so I can't go and check myself unfortunately.