NC35 rear shock

Jashdown · Post by **Jashdown** » Wed Oct 12, 2011 12:46 am

Hey guys, I'm just wondering if anyone know's the exact free length of the standard NC35 shock absorber spring, and also if they know the length of the spring when it's installed on the shock at the most relaxed preload setting.

I just need to info so I can get the correct adapter made up for my 600RR shock.

Cheeers,
Josh

Post by **BillingCBR** » Wed Oct 12, 2011 1:05 am

what do you need the spring length for? IIRC you need to change the spring rate and the battery tray to fit a 600rr shock

Jashdown · Post by **Jashdown** » Wed Oct 12, 2011 1:24 am

I need it so I can have an adapter collar made up for the 600RR shock/spring, I need the NC35 spring free length and also the compressed spring length at the most relaxed preload setting in order for me to do it correctly and have a suitabile amount of adjustment for preload.

If I go off the specifications of the 600RR shock for the compressed spring length, it won't be similar the NC35 specs, meaning I might not be able to set the static sag and rider sag correctly. So I could end up with a shock that has 0 static sag at the most relaxed preload, or it could have the correct static sag at the maximum preload setting.

It needs to be set up properly because I'll be taking pillions and taking it on the track occasionally.

Post by **CMSMJ1** » Wed Oct 12, 2011 8:24 am

I don't get it either. Get a correct rate spring for it? That is a better fix than running excessive preload surely?

Jashdown · Post by **Jashdown** » Wed Oct 12, 2011 9:02 am

Ok, the stock spring in the 600RR shock is 185mm (free length), the springs length when it's installed on the shock is 170mm, which means it has 15mm initial preload, the shock has 10mm of adjustable preload, so the maximum preload on the spring will be 25mm.

That particular set up is for a CBR600RR, not the NC35.

I'm already getting the correct spring rate, that's not the problem, the problem is that I don't know the initial preload on the standard RVF shock.

If I put a 7" spring on (177.8mm), it will only have 7.2mm initial preload (compared to 15mm for the standard spring), which means at max preload, it's only compressed 17.2mm (compared to 25mm for the standard spring).

That might all be well and good, but if the spring needs to have say, 20mm compression so that it has the correct static sag, then I can't possibly set up the suspension correctly.

Hence my asking for the info from the RVF shock, so I can set my 600RR shock similarly, in order for it to behave properly, and have the correct level of adjustment.

Post by **CMSMJ1** » Wed Oct 12, 2011 9:19 am

The RVF shock will be undersprung for you I would guess - if you are a "normal" sized caucasian gentleman.

No idea on the preload - but I suspect discounting the RVF shock from your calculations will not hamper your progress.

The CBR is longer, the ride height is taller and the linkage ration wil be slightly changed due to this. What rate spring have you gone for?

I run an 875lbs per inch on my RS250 shock - probably should have gone higher as with my leathers and gear on I am 15st easy.

Jashdown · Post by **Jashdown** » Wed Oct 12, 2011 10:32 am

Yeah, I'm just worried because I have to get an adapter collar made up, so a standard 7" spring will fit, due to the fact that the stock 600RR spring is tapered.

I've always had bad luck with rear shocks on bikes, so I want to at least get this one set up right, haha.

I'm 190lb without gear, so probably 210lb with full gear, so I'm either going for the 850lb or 875lb spring, I'll be riding it on the road mainly, so can't have a too firm spring.

I think I'll just get a 10mm thick adapter collar made up, so my 7" spring will have 17.8mm preload at the lowest setting, hopefully that should work, and allow me to set the static sag appropriately.

ludacris · Post by **ludacris** » Wed Oct 12, 2011 2:40 pm

Well accroding to the Haynes manual, it says the free length of the RVF shock spring is 121mm which seems wrong to me...

Josh I was gonna recommend you ask Will as he should have a stock one laying around his place..should be able to give you the proper free length of the sotcker spring (158mm sounds more plausible to me)...don't know if you'll get info for the length of the spring at the softest setting though

Jashdown · Post by **Jashdown** » Wed Oct 12, 2011 2:54 pm

Thanks mate. Yeah I sent Will a PM, hopefully he gets back to me soon, haha. I need to fit this shock as soon as possible, my current one is rooted.

Yeah 121mm is certainly not right, just looking at it while it's on my bike it's longer than that. Haha.

The compressed length should be the easiest to find out, it can be taken while the spring is on the shock, just need to chuck a ruler against it and measure the spring from top to bottom, with minimum preload.

Post by **Drunkn Munky** » Wed Oct 12, 2011 4:51 pm

I see what yout getting at but i dont think its going to work out like you think. I dont think matching the spring free length/compressed length off the RVF spring will make any difference, the spring should be more matched to the shock rather than the bike surely???

The compressed spring length on a aftermarket WP 600rr shock i had was 135mm so thats nowhere near what the standard springs free length is, id just fit a spring thats the right length for the 600rr shock you have. As said your need a heavier spring weight than the 600rr uses so now the valving is your limiting factor and really needs revalving to suit the heavier spring to make the best from it.

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