SP1 vs SP2 brake caliper difference ? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 12-10-2009, 06:47 PM Thread Starter
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SP1 vs SP2 brake caliper difference ?

Hi guys,

Browsing through a parts catalogue and I noticed different part numbers for thefron calipers & brake pads from SP1 to SP2. Any idea what the physical difference is ?

Thanks for any feedback
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post #2 of 12 (permalink) Old 12-10-2009, 08:20 PM
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The front rotor thickness was difference between SP1 and SP2 (.5mm thicker).
If there is any difference, there can't be much.
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post #3 of 12 (permalink) Old 12-12-2009, 05:45 AM
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The SP1 caliper pistons are 34/32 and I think the SP2s are the same though they may be different as the SP2 has a 17mm master cylinder where the SP1 has a 19mm.
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post #4 of 12 (permalink) Old 12-12-2009, 11:38 AM Thread Starter
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That's interesting. I am quite surprised that there are so many differences between the two models. The second injectors, lighter wheels and the like can be expected but disc & calipers are fine tuning on the part of Honda.
I'll have to be careful when purchasing used or new parts for my bike.

I just purchased a 2000 model and have been reading up quite a bit on this website. You guys have some really good feedback to help fellow riders.

Thanks guys
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post #5 of 12 (permalink) Old 12-12-2009, 06:12 PM
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I don't think they changed the calipers at all, only the master cylinder piston diameter for different feel.
The calipers are the same as the ones used on the CBR600F4i of the period, except the RC51's are gold and the 600's are black.
They are actually very good and light calipers for non-radial design.
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post #6 of 12 (permalink) Old 12-13-2009, 05:42 AM
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also the 929 and 954 have the same gold calipers (one of them may have had 32/30s), the 929 and the SP1s had 19mm MCs and then the 954/SP2 went to the 17mm. As subsailor said you'll get different feel, slightly more lever travel / slightly less effort required. I've found all the parts can be easily interchanged.

I think the brakes on my SP1 are as good as anything else I've ridden.
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post #7 of 12 (permalink) Old 12-13-2009, 06:36 PM
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The 19mm piston diameter is usually desired on the track over the 17mm diameter as you want better feel what the brakes are using as opposed to leverage.
The smaller diameter is better served on the street.
For better pad bite with the larger diameter piston, the use of pads with harder bite can be used (such as the HRC hard bite pads).
The newer model Brembo master cylinder has the option of changing leverage ratio to suite rider preference.
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post #8 of 12 (permalink) Old 12-15-2009, 10:08 PM
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The calipers use different diameter pistons between the two models (SP1 and SP2). I know this because Ive rebuilt both.
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post #9 of 12 (permalink) Old 12-15-2009, 10:32 PM
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You are correct.
I looked at the caliper and master cylinder specs in the service manual.
SP1 - Master Cylinder 19mm, Caliper pistons 34/32mm
SP2 - Master Cylinder 17mm, Caliper pistons 32/30mm

SP1 Brake Rotor Thickness 4.5mm
SP2 Brake Rotor Thickness 5.0mm

Last edited by SubSailor; 12-15-2009 at 10:35 PM.
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post #10 of 12 (permalink) Old 12-28-2009, 07:55 PM Thread Starter
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Hmmm the calipers on my recently acquired 2000 RC are black...leading me to
want to investigate my brake parts to be sure there wasn't some swapping going on
at one point in it's previous life.
Either way, I will let you guys know how it brakes once I get rolling again in the spring !
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