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North UK

The 2003-2005 650 bikes and ALL 125 GT bikes use the same grey TCTC caliper until 2020  for 125  and up to 2005 ish for older big sister bikes.

The black ones do not say anything but are much much bigger and have 4 pistons inside.   The forks are black for a 650 with bigger spaced out gaps for mounting the bigger calipers directly

grey calipers use 2 pistons. and use a plate to mount to the 125 forks or grey old 650 forks  (floating caliper) , rather than bolted direct to the fork leg.

Hopefully i made sense ?

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