Looks like my rear pads are down to 1 mm or less. front is also very close. I have BR-M447 brakes and Shimano has only one replacement pad the B01S - they say to only use resin pads.

Is the B01S about as good as I can do or are there better alternatives? They are fairly cheap so not a big deal. products that meet this search were more expensive than Shimano B01S Resin Disc Brake Pads and 3 were cheaper. Description: Shimano B01S Resin Disc Brake PadsShimano disc brake pads ensure top braking performance whilst maintaining the safety of your Shimano brake system. Shimano has adopted Ice-Technologies into their disc brake pad range to provide the cooling technology required for consistent performance. These also produce less noise than metal pads and offer increased modulation.Features: ¬†Resin pads make less noise than metal pads and offer better modulation ¬†Flexible compound ¬†Less noise ¬†Focus on controllable performance ¬†Designed for dry and wet conditionsCompatible with the Following Shimano Models:BR-C501; BR-M485; BR-M445; BR-M395; BR-TX805; BR-M575; BR-M475; BR-M416; BR-M375; BR-M525; BR-M465; BR-M416A; BR-M355; BR-M495; BR-M447; BR-M415; BR-T675; BR-M486; BR-M446; BR-M4050; BR-T615A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.We then wanted to get a bit more specific and only look at Shimano products that are listed in the Brake Pads category. You will also need to consider if you are running carbon wheels, that different bike brake pads will be required to ensure no damage is done to the rim. Usually it's a good idea to bleed the brakes when you install new pads. Not a requirement though and as long as you have a firm brake lever it will be fine.

Price, as you would imagine, is the most popular reason for someone buying one product over another. It is the single most important factor in choosing the majority of products we buy. The same goes for Brake Pads. So the first aspect of price that we’re going to look at is the price of Shimano B01S Resin Disc Brake Pads.

I do have Shimano rotors that say "resin only" but prices on rotors don't seem that bad so I was thinking maybe semi metallics might work?