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The caliper is made for a G (or J too if you wanna go finned) and as +edscoble pointed out, B fits but there's a much bigger parallel gap between the caliper and pads which causes rocking or juddering under heavy breaking.
YMMV, B in a G caliper works ok, which is probably why you've not noticed it.
Also, curious why are you using Elvedes pads? Stop gap (pun intended!) during the Shimano factory fire + COVID + Evergreen shortage?
Can't find my G spare pads but this the compatibility list from the J04C.
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coventry_eagle
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Also, curious why are you using Elvedes pads?
TBF they’re aren’t bad, lots of shop sell them due to The Cycle Division.
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I think I said elsewhere... these are what came with the bike when I bought it. They stopped the bike so I've not had cause to care about them. I feel they're probably getting closer to the end of their life now though so I want to have a set or two of pads on hand as spares for longer rides.
The whole system could do with a bit of a clean so I might pre-emptively change the pads but I now have two pairs of G04S pads that I can carry if/when they shit it during a ride.
edscoble
hippy
So, you reckon I could get a G04S pad and it'll be fine? They look close enough so I presume they'll fit and if rotors are the same size. Stupid product codes.