For the TD4 rear brake caliper (GRX), we’ll need Shimano 33 (C) & 29 (C2) mm fixing screws. Correct?
Steve The Intern Answered question
Minimum thread engagement stated by SRAM is 5 to 7mm; couldn’t find Shimano as quickly. Our slider is 17.5mm thick. So minimum bolt length is 24mm (washer compensation), up to a max of probably around 30mm before you would bottom out on the inside of the caliper and not be able to tighten it down.
Steve The Intern Answered question