I have a set of the b53 commuter fenders on my giant roam 3.
I'm running the stock tires (700x40) and they work nice and look good.
The trick to keeping them nice and straight is to remove the stress from the metal struts before they get mounted and trimmed.
This way they want to be consistant after the install (no pulling back and forth).
I did find that the front fender could be a bit longer at the bottom for better spray control.
Good looking fenders for sure.
Mick