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CBR600 Shock

Great, thank you. And I assume either the upper or lower mounting point needs a spacer to fit properly? (or washers)
 
We will know everything about it as soon as Ruggybuggy install it on his NC :D ...I received mine yesturday, but have no time to install it before a long time...So we stay tuned Ruggy !
 
Oh, and I'll summarize what I wrote about the CBR600 F4i shock in the other thread.

It is firmer, but more much compliant over bumps. Very happy with it for 40 bucks.

It is a bit shorter, so you would lose ~.5" (12mm) of ride height, but the stiffer, more adjustable spring means less sag for most riders.

The stroke is 12% less, so not taking into account any effect of the linkage not being linear, you lose about .7" (18mm) out of 5.9" (150mm) of travel.
 
maxwellian said:
I'm curious what drew y'all to the Tuono shock.

It looks to me like the tuono shock has low reservoir capacity, and is going to need a stiffer spring (Tuono is 10kg, CBR f4i is 14kg, NC is probably closer to the latter). Will the stock NCx spring fit on the tuono shock?

http://www.penskeshocks.com/assets/PENSKE SPRING APPLICATION CHART.pdf
RT - Digital Product Search
Click to expand...


I decided on the tuono shock because it had an identical extended length so no loss in seat height. I also didn't want to try attaching a reservoir to the side of the bike. Also the Tuono adjustment rings are in a better position (top) like the NC to make adjustments easier. I don't remember who on the forum mentioned it but because the Tuono has approx. the same weight as the NC and is a sport bike the spring should be heavier. You have me wondering about the NC spring fitting on the Tuono spring?

Well see on Tuesday how it all works out.
 
I think the Tuono may have a softer spring due to a larger shock stroke to travel ratio, less leverage. I guess we'll see when you mount it, what your sag is.

My adjuster is a bit hard to get to, though easier to move than a threaded one. Mounting the reservoir was pretty painless.
 
There are a few Tuono shocks to choose from as well. The base SACHS shock for the Tuono does not have an external reservoir, or attached. It merely has a combined rebound/compression adjustment similar to the aftermarket shocks available for our bikes.

This is the "base" model shock and while not as good as the remote reservoir shock, it probably mounts a lot easier. This is what I have. I will put it on this weekend (or next at the latest) and report back.

If it doesn't work out well, I'll go with a tried and true CBR600 shock as Maxwellian has -- as the less than half of an inch of reduced travel is really a non-issue.
 
Well I have to report the Tuono shock spring is not strong enough. Sag went to 89mm and for comparison the NC spring had a 51mm sag with my weight. If a proper spring can be found this could be a very nice set up. The shock fits in perfect and spacing can be made up with 10mm washers. Maybe someone here can suggest a spring because I don't have a clue about spring rates VS coil size.

On a side note when I had the shock out I took the pivot out and regreased all the needle bearings. Honda uses very little grease so I highly recommend adding grease to these parts.
 
what do you weigh? I see the tuono is 408 pounds. did you adjust the preload? I was really hoping this would be a simple bolt on. have you ridden the bike with the new shock?
 
The Tuono has adjustable preload, but maybe he had all the preload he could get and it was still too undersprung? I'd be surprised if that happens for me, at 180lbs.

As far as spring rate affecting compression: It should not. In a Properly working shock, with compression and rebound damping valves that are of sufficient quality (not like our stock nc shocks), the spring should ONLY provide resistance to set the preload (sag). The compression and rebound valving should control the "stiffness" and speed of shock movement.

In the real world, our bikes (and lots of others), come with under-valved shocks, which means the compression valve cannot "keep up", and then you end up literally riding on the spring. In these cases, more preload means more stiffness on big bumps and more "bouncing" (less rebound damping) upon recovery from those bumps.

Bottom line? Poor quality shocks are just like driving a car with a blown shock - you spend all day riding around on the spring at the mercy of the spring rate and road.

On another topic: If you do need a new spring, go to Racetech's website, put in 2007 Aprilia. Tuono and buy a spring for your weight. Put it on your tuono shock and enjoy.
 
Wait, but wouldn't that still give you a weak spring? You need to calculate the spring rate for our bike, and get one in the tuono dimensions.

I think the spring is softer not just because of a difference in weight, but a difference in linkage ratio.
 
Also, I see what you mean about the valving being unrelated to spring rate. So it should be related to travel to stroke ratio. A very short stroke shock would move slower and have more resistance, right? Or a shock with the same stroke meant for longer travel.
 
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