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grams
snottyotter
G is the pad shape, so all G work with your caliper, the number is the compound, used to be 01 was resin and 02 was sintered but there have been improved compounds since and they've gone up in odd numbers for resin, S or A is backing material S for steel, A for Alu, Ti for something completely obvious, I've not got round to learning why they've started adding RX to all of them yet. I'd generally recommend going for the 05S that fits unless you're riding MTB where sintered makes sense, or very big descents, where cooling fins can help, or both.