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Works perfectly. Just with less friction.
The standard grx jockey wheels are the same size. AFAIK it's only the 12 speed mtb shimano rear mechs that use oversized jockey wheels as standard.
yetidamo-
The bottom one stock is 13t as opposed to 11t from the hope/standard 105/ultegra/DA
giofox
How does the rear mech work with Hope jockey wheels compared to the original bigger wheel?