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Author Topic: What is the diameter of a CB750K3 OEM front brake rotor?  (Read 386 times)

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Offline K-Man

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What is the diameter of a CB750K3 OEM front brake rotor?
« on: March 14, 2020, 09:25:12 AM »
Good Morning,

Re-habbing a '73 CB750K3 that came to me with an aftermarket front wheel & rotor from some non-CB750.  Not sure if the rotor is the stock diameter.  Looking at replacement / upgrade rotor options I found a post here on the forum that says the replacement rotor made by EBC is too large and requiresa  '77 - '78 caliper.  Searching the web I find the EBC diameter is listed as 11 5/8".  Trying to comfirm what the '73 K3 stock rotor diameter is for comparison.  For reference EBC part number is VMD-1062.

K-Man

 
« Last Edit: March 14, 2020, 09:27:10 AM by K-Man »
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Offline jaytee-nz

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Re: What is the diameter of a CB750K3 OEM front brake rotor?
« Reply #1 on: March 14, 2020, 05:18:39 PM »
They are 295mm which I think converts to 11 & 5/8's inches.
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Offline K-Man

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Re: What is the diameter of a CB750K3 OEM front brake rotor?
« Reply #2 on: March 14, 2020, 06:42:01 PM »
Cool.  Thanks!
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Offline scottly

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Re: What is the diameter of a CB750K3 OEM front brake rotor?
« Reply #3 on: March 14, 2020, 10:29:12 PM »
The reason a K7/8 caliper is required for the EBC rotor is the earlier calipers mount lower on the rotor than the late ones, and will interfere with the rotor carrier. What do you have now? BTW, the 550 rotors were the same 6 bolt mounting as the 750, but were 275mm/10 7/8".
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