SP1 Rotor to Rotor Measurement - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 07-28-2012, 08:33 PM Thread Starter
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SP1 Rotor to Rotor Measurement

I really need the Measurments of rc51 sp1 rotors on oem wheels.

I need a rotor to rotor measurment preferbly outside to outside in millimeters using a micrometer/digital caliper.

Can anyone help! I would so greatly appreciate it. Im in a huge predicament without this measurment.
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post #2 of 19 (permalink) Old 07-28-2012, 11:27 PM
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There you go

142.83mm outer braking surface to outer braking surface



My Öhlins Project: https://www.rc51forums.com/forums/showthread.php?t=6033
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post #3 of 19 (permalink) Old 07-29-2012, 10:26 AM Thread Starter
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Freaking Awesome! Thanks thats exactly what I needed and exactly the measurement i was hoping for!

My thought is now if you take sp2 rotors and put them on an sp1 wheels. Will you get the same Measurement!?

Do the sp1 and sp2 rotors have the same offset? Can you swap rotors no problem and they will fit perfect?

On a side note I also heard cbr1000rr 06-07 rotors swap to rc51's is this true?

I need for sure answers no guesses.

MakisRC51- Thanks again! I really appreciate you taking the time to do that. with a picture and everything!!!! Thanks!
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post #4 of 19 (permalink) Old 07-29-2012, 12:59 PM
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Man, anytime you want (and I can), don't think twice to ask for it.

All OEM RC51 rotors are identical and even though SP1 wheels are different designed from the SP2's, the size of them are the same.
CBRs 06-07 have 320mm diameter rotors (and they are much more beautiful IMHO) and they are a direct swap on a stock RC51's front fork/wheel

If you see in my RC51's story, when I bought her I was running a set of CBR 04-05 rotors (was all I had available at the time) and they fitted perfectly. The problem was that they measure 310mm diameter so the brake pads wear uneven and at some point they contact each other on the 5mm left out strip and you cannot brake anymore
However even those rotors fit......bolts, wheel center etc etc.....

HONDA RULES!!!


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post #5 of 19 (permalink) Old 07-29-2012, 01:07 PM
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There you go

142.83mm outer braking surface to outer braking surface

Sweetjesus Makis, where'd you find that rusty old tape measure?
If I EVER need any measurements...

John, 2000 RC51 #000100

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post #6 of 19 (permalink) Old 07-29-2012, 01:13 PM
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I grab whatever I had in hand on my garage cause it was 6:15am and I was leaving for work ......(seriously!)


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Last edited by MakisRC51; 07-30-2012 at 02:18 AM.
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post #7 of 19 (permalink) Old 07-29-2012, 01:16 PM
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I grab whatever I had in hand on my garage cause it was 6:15am and I was leaning for work ......(seriously!)
You know I was kidding right? If I had one of those, I could throw away MY rusty old tape measure.

John, 2000 RC51 #000100

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post #8 of 19 (permalink) Old 07-29-2012, 01:21 PM
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You know I was kidding right? If I had one of those, I could throw away MY rusty old tape measure.
Of course I know you're kidding John.....we already have passed that "grey" point of misunderstanding

Why don't you buy one?

I bought this 3 years ago from eBay for like $30 I think.

Just remember to take the battery of when you're not using it.....it drains it really fast and that sucker costs $5 (here at least )


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post #9 of 19 (permalink) Old 07-29-2012, 01:38 PM Thread Starter
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Originally Posted by MakisRC51 View Post
Man, anytime you want (and I can), don't think twice to ask for it.

All OEM RC51 rotors are identical and even though SP1 wheels are different designed from the SP2's, the size of them are the same.
CBRs 06-07 have 320mm diameter rotors (and they are much more beautiful IMHO) and they are a direct swap on a stock RC51's front fork/wheel

If you see in my RC51's story, when I bought her I was running a set of CBR 04-05 rotors (was all I had available at the time) and they fitted perfectly. The problem was that they measure 310mm diameter so the brake pads wear uneven and at some point they contact each other on the 5mm left out strip and you cannot brake anymore
However even those rotors fit......bolts, wheel center etc etc.....

HONDA RULES!!!
Awesome more great info! You are helping me out a ton!

I agree the cbr rotors are visually more pleasing. I figured if i needed RC51 rotors and the 06-07 cbr rotors were same diameter and offset then i would use those instead.

I have radial mounted caliper so the calipers cant slide to fit the rotors. so the rotors must have the same offset.
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post #10 of 19 (permalink) Old 07-29-2012, 01:44 PM
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There are spacers for the radial calipers.

I used from the 06-07 Blade on my brackets cause they were made for 310mm rotors.

If I ever swap to 954's rotors I will make my own spacers though....


My Öhlins Project: https://www.rc51forums.com/forums/showthread.php?t=6033
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Congratulation to MakisRC51 for winning the 2014 Bike Of The Year Contest!
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