Fireblade Rear Shock Interchangeability? (Ohlins) - Honda Motorcycles - FireBlades.org
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post #1 of 16 Old 08-29-2019, 7:14 PM Thread Starter
 
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Fireblade Rear Shock Interchangeability? (Ohlins)

So I have the option to purchase an Ohlins rear shock, the part number is specifically for the SC28. This shock is discontinued, but I am told they are rebuild-able.

The question I have is, is there a benefit to using an Ohlins shock from a more modern fireblade on my SC28? From the SC33, SC44, SC50?

I have read that people swap in shocks from more modern blades, but I'm assuming this is due to availability?

Did Ohlins improve their shock technology between generations?
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post #2 of 16 Old 08-29-2019, 9:41 PM
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

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Originally Posted by dualheadlamps View Post
So I have the option to purchase an Ohlins rear shock, the part number is specifically for the SC28. This shock is discontinued, but I am told they are rebuild-able.

The question I have is, is there a benefit to using an Ohlins shock from a more modern fireblade on my SC28? From the SC33, SC44, SC50?

I have read that people swap in shocks from more modern blades, but I'm assuming this is due to availability?

Did Ohlins improve their shock technology between generations?
Piggyback reservoir shocks will not work from later 954/929 due to the battery box and a small cross member on the subframe being in the way. Also, the shock overall length and stroke differ from SC28 and both SC33ís. Itís not much, but there are changes in the top mount on the frame which led to the shock length change.

What model is the Ohlins for?
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post #3 of 16 Old 08-30-2019, 1:47 AM Thread Starter
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

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Originally Posted by IanDoohan View Post
Piggyback reservoir shocks will not work from later 954/929 due to the battery box and a small cross member on the subframe being in the way. Also, the shock overall length and stroke differ from SC28 and both SC33ís. Itís not much, but there are changes in the top mount on the frame which led to the shock length change.

What model is the Ohlins for?
How many mm are we talking between SC28 and both SC33s? Longer or shorter? What about valving? Just for future reference.

The Ohlins is for SC28, my frame is SC28. I just wanted to be sure there is no benefit to getting an Ohlins shock from a more modern blade before I drop the dough. Sounds like the SC28 Ohlins would be best for me.
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post #4 of 16 Old 08-30-2019, 4:08 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Hello DualHeadLamps, In another Thread - from memory, discussing bike lean angle on the side stand - somebody said this about shock lengths:

"The other possibility is that the wrong rear shock has been fitted, different years were slightly different lengths:
CBR900RR 1992-1995 319mm
CBR900RR 1996-1997 305mm
CBR900RR 1998-1999 303mm"

I cut&paste this into my Useful Information Document, but cannot remember who posted it, apologies.
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post #5 of 16 Old 08-30-2019, 5:43 AM Thread Starter
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

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Originally Posted by Duncan893 View Post
Hello DualHeadLamps, In another Thread - from memory, discussing bike lean angle on the side stand - somebody said this about shock lengths:

"The other possibility is that the wrong rear shock has been fitted, different years were slightly different lengths:
CBR900RR 1992-1995 319mm
CBR900RR 1996-1997 305mm
CBR900RR 1998-1999 303mm"

I cut&paste this into my Useful Information Document, but cannot remember who posted it, apologies.
Very helpful, thanks. Now that you mention it, I remember seeing that somewhere too.

I know the taboos of lowering sport bikes, but being a rather short rider I'm tempted to to put a 1998-1999 rear shock in my SC28 and drop the front accordingly...
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post #6 of 16 Old 08-30-2019, 5:53 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

It might be worth having a chat with an Ohlins dealer or servicing specialist .......

Given that the Ohlins have ride height adjustment, it would be good to know if:

1/ they are all the same part number and we achieve the correct length through that adjuster (feels unlikely),
or
2/ if they are different, where within the ride height range the std length is (can you both raise & lower ride height)
or
3/ can the wrong shock be changed to the right length with a replacement ride height adjuster?
or
4/ something else .....

If you see what I mean?
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post #7 of 16 Old 08-30-2019, 6:35 AM Thread Starter
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

I find communicating with manufacturers regarding discontinued products gets nowhere. When they don't see a possible sale, no support exists. I have reached out to Ohlins, we'll see how it goes.

They do have 3 different part numbers for SC28 and SC33. One for SC28, one for 96-97 SC33, another for 98-99 SC33. Your dimensions probably check out.

Don't know why I didn't consider the body adjust ability of the shock, thought it might have just been pre-load.

Either way, it's always best to maximise travel, so if lowering a SC28, 98-99 SC33 shock might be best. Of course, given there are no adverse affects from valving or fitment of the shock. Springs can always be changed.

I'm positive Ohlins manufactured each shock to be able to have factory ride height, otherwise front to rear rake would not be standard when installing their aftermarket shock.

Doing some research on lowering now, even though everything I've skimmed in the past says not to do it. I feel I would really benefit from it.
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Last edited by dualheadlamps; 08-30-2019 at 8:13 AM.
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post #8 of 16 Old 08-30-2019, 8:11 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Agreed.

I have a manual for an Ohlins Shock and the Length Specs say: Xmm +12/-0mm. Where Xmm is the Std ride height and therefore the minimum length ........

If all of this holds true, and you want reduced ride height, then by example, you could use a 96/97MY Ohlins Shock at the 305mm Std (min), and have adjustment to 317mm max. (2mm shy of the 92-95MY 319mm).

Could be a result?
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post #9 of 16 Old 08-30-2019, 8:20 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Or ........ Honda lowering kits | CBR 1000RR, CBR 954RR, CBR 929RR, CBR 900RR Fireblade lowering kits CB650F CBR650F | NC750X, NC750S lowering, Honda CBR600RR lowering kits, VFR1200S VFR800F VFR800X CBR500R CB500X CB500S lowering kits |LustRacing.co.uk

Bear in mind this is -30mm bike lowering, not shock length change as discussed above ......
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post #10 of 16 Old 08-30-2019, 8:27 AM Thread Starter
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Just checked all the Ohlins documentation for SC28 and SC33 rear shocks. Your dimensions from post 4 are correct.

Also, they are all +12/-0mm, so they are only meant to be used to increase shock body length, not decrease.

I have seen those lowering kits where they change the mounting position of the shock, not sure what to think of those yet. Still researching.
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post #11 of 16 Old 08-30-2019, 8:58 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

BenelliBlade was the source of knowledge on the shock lengths. Good Job!

https://www.fireblades.org/forums/ho...ide-stand.html
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post #12 of 16 Old 08-30-2019, 11:17 AM
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Quote:
Originally Posted by Duncan893 View Post
BenelliBlade was the source of knowledge on the shock lengths. Good Job!

https://www.fireblades.org/forums/ho...ide-stand.html

I'm not the original source however, I found an Excel spreadsheet with a bunch of different shock lengths listed way back when I had an SV650 and was looking for a better shock (ZX10R and ZZR1400 IIRC). There's nothing I've found that will suit the early Blades from other manufacturers though.
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post #13 of 16 Old 08-30-2019, 12:00 PM
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

I stole this and have posted it before when researching for my Fox and Penske that I have on my 93 and 99 respectively. The ride height adjusters on both were worth their weight in gold.

First pic references the top line category. Second is Honda.

Click image for larger version

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Click image for larger version

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ID:	94658
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post #14 of 16 Old 09-04-2019, 4:41 AM Thread Starter
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Thanks for all the help, I passed on the SC28 Ohlins, glad I did. Going to hold off for a 98-99 Ohlins. Don't want to change the suspension geometry with those lowering "kits".
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post #15 of 16 Old 09-04-2019, 5:03 AM
 
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Re: Fireblade Rear Shock Interchangeability? (Ohlins)

Hello DualHeadLamps, where is your location? If you are in the UK, you will have seen this one ......

https://www.ebay.co.uk/itm/Honda-cbr...MAAOSwBCNdYFDw

14mm shorter than a 92-95 shock (adjustable +12/-0), and only 2mm longer than a 98-99 ......... based upon that table of data.
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