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IIRC the F4i calipers have the same piston sizes as the SP-1 and 929 (and 98-99 CBR900RR; larger than the SP-2 and 954 FWIW).
 

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while outwardly the same, the piston diameters are different on the Sp-1 and 2 (same as for the 929 and 954). This topic has been covered a few times (with appropriate MC and caliper piston diameters listed) on the Superhawk forum.
 

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Here is a partial list for you (from Superhawk forum):
2003-2004 CBR600RR mc 11/16” (17.4625 mm)
caliper pistons 32mm/30mm

2000-2001 CBR929RR mc 19mm
caliper pistons 34mm/30mm

2002-2003 CBR954RR mc 11/16” (17.4625 mm)
caliper pistons 32mm/30mm

2000-2001 RC51 mc 19mm
caliper pistons 34mm/32mm

2002-present RC51 mc 11/16” (17.4625 mm)
caliper pistons 32mm/30mm

1999-Present CBR600F4(i) mc 5/8” (15.87mm)
caliper pistons 34mm
/32mm
 
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