Quote:
Originally posted by ali
. The way I see it is that, as the shock is at 45 degrees not vertical like a 916, 15mm of adjustment is actually only equivalent to 8mm vertical adjustment.
I'm absolutely positive that I've got some of the above wrong, so feel free to laugh at my massive ineptitude in all things suspension related...
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I would say you are a bit wrong there Ali, the chances are your shock ratio is about 2:1 but the not in the way you have discribed. Assume 50mm of Stroke on the shock this will give 100mm of rear wheel travel if the ratio is 2:1
To get a rough idea of the ratio measue from the swingarm pivot to the rear wheel spindle and then from the swingarm pivot to where the shock fixes on the A-frame of the swing arm, this will give you a basic ratio, a small degree of rising rate is added as the shock moves through a arc, this means things aren't totaly linear so you end up with a rising rate curve could be in the region of 1.9 to 1 through to 2.0 to 1.
Now if you increase the shock length by 5mm it will push the rear wheel futher from the seat by 5mm X the ratio..
try taking 5mm of preload off the rear spring, this will effectively make the damper rod sit futher into the shock body simulating a 5mm shorter shock, I bet a distance measured between the rear spindle and a point on the rear of the seat unit reduce by nearly 10mm, conversely increasing the shock length by 5mm will raise the bike by 5mm X the ratio so almost 10mm in the example.
A Harris Magnum 2 with the cantilever rear end has a ratio of 1.7 to 1
And no you cant have my Hi/Low speed damping Penske it cost more than a Ohlins and unlike a 916 Ohlins it also has a rideheight adjuster.
Kev