This is for the compression stack only, not rebound. and came from the instructions for a S2040 gold valve.
It assumes that you're using a gold valve and not the stock valve, although I expect (no evidence yet) that it only matters at high shaft rates. I understand that Showa forks have adequate flow for most purposes.
c30 | c31 | c32 | c33 | c34 | c35 | c36 | c37 | c38 | c39 |
---|---|---|---|---|---|---|---|---|---|
Gold valve goes here | |||||||||
.10 x 17 | (1) .15 x 17 | (2) .15 x 17 | (3) .15 x 17 | (4) .15 x 17 | (5) .15 x 17 | (6) .15 x 17 | (7) .15 x 17 | (8) .15 x 17 | (9) .15 x 17 |
<----- .10 x 15 -----> | |||||||||
<----- .10 x 13 -----> | |||||||||
<----- .10 x 12 -----> | |||||||||
<----- .10 x 11 -----> | |||||||||
<----- .10 x 10 -----> | |||||||||
<----- .10 x 9 -----> |
Here is the RaceTech chart for which shimstack to use.
They only list a single rebound stack in the S2040 instructions.
Gold Valve goes here |
(6) .15 x 17 |
(1) .10 x 9 |
baseplate |
r14 | r15 | r16 | r17 | r18 | r19 | r20 | r21 | r22 | r23 |
---|---|---|---|---|---|---|---|---|---|
(4) .15 x 17 | (5) .15 x 17 | (6) .15 x 17 | (7) .15 x 17 | (8) .15 x 17 | (9) .15 x 17 | (10) .15 x 17 | (11) .15 x 17 | (12) .15 x 17 | (13) .15 x 17 |
<----- .10 x 9mm -----> |
from there:
+4 for springs between 1.05 and 1.1kg/mm
+2 for springs between .96 and 1.05kg/mm
no change for springs between .85 and .95 kg/mm
-2 for springs between .65 and .85kg/mm
-4 for springs between .55 and .65kg/mm
no change for 5 wt oil (US-1)
-2 for 10 wt (US-2) oil
+1 for 12mm damper rods (less oil being squished, so more dampign needed)