Question: inner diameter rear brake calipers 1 3/4"

Technical advice Q&A

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wagstefan
Posts: 216
Joined: Sat Mar 12, 2011 3:29 am
Location: Germany
Germany

#1 Question: inner diameter rear brake calipers 1 3/4"

Post by wagstefan » Sat Jun 06, 2026 4:51 pm

Hello chaps,

I wonder what inner diameter the rear brake calipers / diameter are supposed to have, if given as 1 3/4".

There are some on the market with grinded away casting numering after the "1" and stamped 3/4. But inner diameter of the caliper is said to be 47,5mm. But this is actually 1 7/8".....?
Or are the calipers that bigger to make spare for the sealing and the pistons are 1 3/4"? But thisvseems odd to me.

Thank you for any comment!

I wish you a nice weekend!


Stefan

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