SP2 Subframe compared to SP1 - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 25 (permalink) Old 04-18-2011, 09:28 PM Thread Starter
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SP2 Subframe compared to SP1

Anybody know if there is any advantage of having an SP2 subframe over and SP1? Or does anyone manufacture one similair to the HRC race kit version?

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post #2 of 25 (permalink) Old 04-18-2011, 11:34 PM
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The SP2 subframe was designed to allow the rear portion to be trimmed for race bodywork, which then resembled the HRC subframe.
The SP2 subframe is a bit lighter, plus it went with the repositioned battery and ECU under the rider's seat for mass centralization.

Here's a comparison of the HRC SP2 and an regular SP2.
Note the similar shape of the subframes (especially if you imagine the rear portion removed from the SP2's).



Last edited by SubSailor; 04-18-2011 at 11:38 PM.
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post #3 of 25 (permalink) Old 04-19-2011, 12:19 AM
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That is really great side-by-side photo!

John, 2000 RC51 #000100

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post #4 of 25 (permalink) Old 04-19-2011, 02:16 AM
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Will a SP2 fit on a SP1?

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post #5 of 25 (permalink) Old 04-19-2011, 12:25 PM
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Quote:
Originally Posted by Waldo View Post
Will a SP2 fit on a SP1?
Physically it should.
However the fenders are different since the ECU is located behind the battery vs alongside as in the SP2.
I'm not sure if the SP1 fender will mate with the SP2 subframe, but on the surface it looks like it might.
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post #6 of 25 (permalink) Old 04-19-2011, 03:40 PM Thread Starter
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hmm....interesting. thanks for the info Subsailor. i'm thinking i might try an sp2 subframe, and modify it if i need to. The fenders are different, you'd have to buy an sp2 fender to go with it. the subframe attachments and relay mounts are different

2001 Honda RC51 SP1
1996 Honda CBR 900RR
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1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #7 of 25 (permalink) Old 04-19-2011, 04:48 PM
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Quote:
Originally Posted by gts455 View Post
hmm....interesting. thanks for the info Subsailor. i'm thinking i might try an sp2 subframe, and modify it if i need to. The fenders are different, you'd have to buy an sp2 fender to go with it. the subframe attachments and relay mounts are different
As long as the the SP2 sub would bolt and be in the correct angle/location to mount the tail fairing, the rest does not matter. If you do mount one, post it. I would be interested.

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post #8 of 25 (permalink) Old 04-19-2011, 05:26 PM
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Here's the two fenders for comparison.
The SP1 only had three relays (in line across) at the rear as opposed to four (2 on each side) for the SP2.
The main difference would be the length of the wiring harnesses to allow repositioning.

SP1 Rear Fender


SP2 Rear Fender

Last edited by SubSailor; 04-19-2011 at 05:54 PM.
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post #9 of 25 (permalink) Old 04-19-2011, 05:54 PM Thread Starter
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Quote:
Originally Posted by Waldo View Post
As long as the the SP2 sub would bolt and be in the correct angle/location to mount the tail fairing, the rest does not matter. If you do mount one, post it. I would be interested.
ok will let you know

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post #10 of 25 (permalink) Old 04-19-2011, 06:05 PM
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Quote:
Originally Posted by SubSailor View Post
Here's the two fenders for comparison.
The SP1 only had three relays (in line across) at the rear as opposed to four (2 on each side) for the SP2.
The main difference would be the length of the wiring harnesses to allow repositioning.

SP1 Rear Fender


SP2 Rear Fender
Thanks sub

In my situation, all my relays and ECU have been moved. I would be using a custome fender/undertail. I am more concerned with will it bolt to the SP1 frame and if so, are the tail fairing holes in the same location. Does anyone have a spare SP2 Sub they would like to either sell cheap or loan me to try?

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