Stock rear shock question

[Artie]

I believe it’s 13” eye to clevis if that’s correct what effect will going to 13 1/4” give me in terms of putting bike on center stand and handling
I generally ride these at a medium pace as we know their dinosaurs by todays standards and looking for a spring rate recommendation as well for cushy ride I weigh 189ilbs

[daves79x]

I think the stockers are 13.5 inches eye-to-eye.

Dave

[NobleHops]

Stock springs will be perfect for you, Artie.

[Artie]

And what rate are stock springs Nils?
I purchased Ikons few years back from you from my first presto CBX but can’t remember the rates but I know when people ask me about ride and handling I describe it similar to mid 60s Dodge dump truck ha ha
The resto I’m doing now would like something much more compliant
Eye to Clevis dimensions seem to be all over the place as well

[EMS]

The CBX is a metric bike. Eye to Clevis should be measured and given in millimeters. When converted to "inches" the numbers end up all over the place. I recall it is 360mm. I have several original 79 and 80 rear shocks and will measure them and will correct myself or confirm that number.

[EMS]

The uninstalled shocks measure: 1979-350mm, 1980-362mm

[NobleHops]

The Ikon 7610-1413 measures 364 eye to clevis, and uses a progressive spring, 18/25/33 is the spring rate. More info on that is found in this thread, Artie:

http://www.cbxclub.com/forum/viewtopic.php?t=10739

[Artie]

Thanx Nils

[jnnngs]

The uninstalled shocks measure: 1979-350mm, 1980-362mm

I was intrigued that '79 and '80 would be different sizes. I just measured them both at 360mm.

[EMS]

The uninstalled shocks measure: 1979-350mm, 1980-362mm

I was intrigued that '79 and '80 would be different sizes. I just measured them both at 360mm.

In Europe, the 79 and 80 (where sold) shocks were identical. The US and Canada had a simpler shock for the 79.
Besides, I think 2mm difference is within the tolerance of measuring and not worth the worry.

[jnnngs]

The uninstalled shocks measure: 1979-350mm, 1980-362mm

I was intrigued that '79 and '80 would be different sizes. I just measured them both at 360mm.

In Europe, the 79 and 80 (where sold) shocks were identical. The US and Canada had a simpler shock for the 79.
Besides, I think 2mm difference is within the tolerance of measuring and not worth the worry.

ah, maybe a typo then. You put 350mm for the '79.

[EMS]

ah, maybe a typo then. You put 350mm for the '79.

Paul, your typo comment prompted me to go back and look again at the shocks and what made me put up the numbers. I had to make sure the shocks were on the same damping setting. There is indeed a difference - smaller than I originally stated - between the two types. It is difficult to really assess what the "as new" conditions of a 40 year old used part actually was. Especially as the springs -like all springs - do set with age and use.

[Rick Pope]

Do the springs or pre-load matter if you're measuring an un-mounted shock? Isn't it "topped out"?

[EMS]

Rick: When you change the damping setting on an unmounted shock, you can clearly see the length changing.

[Rick Pope]

But I didn't mention damping, nor was that addressed above. I asked about preload. What am I missing?