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Offline Tarmacsurfer

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OE rear spring dimensions
« on: February 08, 2019, 02:19:29 PM »
Hello all

I'm aware that the OEM rate C is around 110N/mm, but if anyone could help with inside diameter and free length I would be very grateful. With my planned touring and hard panniers, it would be worth going to 120N/mm I think..but I could do with the OEM specs!

Cheers!

Online Oyabun

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Re: OE rear spring dimensions
« Reply #1 on: February 08, 2019, 10:33:46 PM »
Albeit it is possible to change the spring on the stock rear boinker, but you'd be better off going for an aftermarket or a used cbr600f4 shock instead (my assumption is that you have an ABS bike)
The stock shock has practically no compression damping, and it is a bit on the weak side for rebound too - installing a stronger spring would make it even more underdamped.
E.g. Hagon in the uk makes reliable and cost effective entry level shock models.
Ps, I know it is not an answer ro your question. ;-)
I have messured it once, but I could not find the topic where I have recorded the information by now.
« Last Edit: February 08, 2019, 10:35:27 PM by Oyabun »

Offline Tarmacsurfer

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Re: OE rear spring dimensions
« Reply #2 on: February 08, 2019, 11:40:59 PM »
Cheers fella. Much appreciated.

Offline Rexelstar

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Re: OE rear spring dimensions
« Reply #3 on: February 09, 2019, 09:23:44 AM »
I can find several offered here.

The yellow spring is offered as FS. The red spring as PC 35.

Oyabun could you confirm which one fits the X ?

Yellow link; https://www.speurders.nl/overzicht/schokbreker-mono-honda-cbr-600-f-sport-2001-2002-cbr600fs-173544373.html?sr_ab=0&no_qs=True&query=cbr600f+4+schokbreker

A link for more cbr600 types; https://www.boonstraparts.com/en/onderdelen/  use search menu cbr600

« Last Edit: February 09, 2019, 09:25:53 AM by Rexelstar »
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Online Oyabun

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Re: OE rear spring dimensions
« Reply #4 on: February 09, 2019, 10:09:52 AM »
You should look for 600 f4 (and not f4i) rear shocks.
The F4 was manufactured in 99-2000, and has a reas shock with 312mm eye-to-eye length.
It also has a bit off sprin rate - it is harder than an average rider would like ro use, but at least it has proper damping circuits, both adjustable for rebound and compression and has aj external oil reservoir for cooling so it is at least worth to start with.

Offline Rexelstar

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Re: OE rear spring dimensions
« Reply #5 on: February 09, 2019, 10:32:59 AM »
Thanks.

For the shock on the picture I get a (sellers) reference 1998-2001 CBR600F PC35.

Looks like new on a better pic.
So I guess I am gone take a shot for the 82 euro's  :138:
« Last Edit: February 09, 2019, 10:34:45 AM by Rexelstar »
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Offline gregjet

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Re: OE rear spring dimensions
« Reply #6 on: February 09, 2019, 07:56:07 PM »
You can get the ID simply by measuring the outside diameter and the coil wire thickness. Double the wire thickness and take it from the OD. It is actually more accurate than measuring the ID directly sometimes.
Spring length was loaded length +10mm preload I think.
If the Honda shock spring is not hugely too heavy, you could simply reduce the preload ( different collars). Unlike preloading to get a proper ride height being detrimental to good handling, a stiffer spring withh less preload can be a good way of getting a better spring rate ramp, especially for loaded touring.
I just checked and I don't have the spring dimensions written down and they are on my workshop computer in the chassis software data. If you really need it, I will message you my email address. If you want email me and I will disassemble the stock shock(2013) and measure it. I have an Ohlins on the bike, stock shock is easily accessible.

Offline Tarmacsurfer

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Re: OE rear spring dimensions
« Reply #7 on: February 10, 2019, 03:01:22 AM »
Cheers for that!

Yeah I can sort the ID quite readily as you say...at the moment the bike is parked up in a garage away from my house so as soon as I get access again I'll sort that.

I'll work on an approx 10mm preload too cheers. I'm assuming it is parallel so same ID top and bottom? Sorry I'm used to looking at spring drawings without the need to get my hands dirty first 🤣

Offline Tarmacsurfer

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Re: OE rear spring dimensions
« Reply #8 on: February 21, 2019, 02:46:44 PM »
Just as an aside...fitted an Eibach spring bag to the rear OE damper to keep the crap out ;-)


 


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