For those looking for an advice regarding spring rate - don't take anything for granted and don't trust anyone
Recommended spring rates are way off even on Cascade Components
website!
According to their info, I should use use 550 lbs/in spring for my 85kg [187 lbs].
Based on the info in this thread I collected data for comparison:
-@ Lasse -
500 lbs/in spring @
82 kg [180 lbs] with Marzocchi Bomber CR / fork: ZEB Ultimate 170 mm
-
@maramouse -
525 lbs/in spring @
82 kg [180 lbs] with Öhlins TTX22 M.2 / fork: Fox 38 170 mm
-
@cañonaco - 475 lbs/in spring @
85 kg [190 lbs] with Rock Shox Super Deluxe
-@
goodaa - ???
lbs/in spring @
85 kg [190 lbs] with Öhlins TTX22 M.2 / fork: Fox 38 170 mm
I got confused by the big difference in spring rates used by different bikers
(475-525 lbs/in) and that recommended by Cascade
(550 lbs/in). So I contacted Cascade Components directly and even showed them the data I collected [above]. They confirmed the recommendation twice: "It should still be nice and supple, the 550 is the correct coil for your weight."
So based on their recommendation I ordered
548 lbs/in spring for my
Öhlins TTX22m.2.
Guess what, I got the
SAG 23% [15 mm]. The spring was extremely firm!
So I ordered another spring, this time
502 lbs/in and I got
SAG 29% [19 mm].
I have no way to test the bike as it's snowing like crazy lately but I have a feeling that the Cascade linkage is more suited for air shocks and their progressive characteristics than for linear coil shocks. If my field tests will confirm this to be true, I will experiment with progressive spring, e.g.
Cane Creek VALT.
Nevertheless, lesson learned [money lost]. Honestly, I am really disappointed in Cascade's recommendations, database/knowledge and their support. I understand that you cannot give 100% correct spring rate recommendation but I hoped for little more knowledge from the producer about their own product and base settings for the specific bike and specific rider. 23% SAG I got by using spring they recommended was not even close to expected 28-30% SAG (that they also recommend on their website).
There, learn from my mistakes and experimentation.
I will keep you updated after I get some time on the bike.
Below some photos of the shock, springs weight comparison and linkages:
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