this is Maxton suspension opinion of the gen 4 suspension and what it needs for what it’s worth. They don’t sell Maxton in the US so unfortunately so i went with a nitron rear. It’s good to hear everyone’s feedback as now I’m thinking I want to upgrade my front suspension at some point.
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Most of that is true, but some of it is a bit disingenuous. Like spring rates, the stock springs on both the 3rd and 4th gen is a 9.0N/mm spring, those are the correct spring rates for someone in the 170lbs weight range, which is the overall average weight for rider throughout pretty much the entire world except the US, and maybe some Scandic countries. So to generalize that the stock 4th gen springs are too soft, is not really true. To a 120lbs Filipino guy they are gonna be extremely hard/harsh, while for a 260 pound nordic viking it's gonna be borderline unrideable.
Also, to say that their cartridge has the advantage of a bigger piston size is again not true. The Showa SFF-BP has the exact same 25mm piston/valve size as their cartridge kit, hence the "BP" in the name meaning "big piston". If they wanted to show their cartridges superiority then they should have mentioned that their kit has damping on both legs whereas the stocker has damping in only one leg, which is a genuine advantage for their cartridge, and when valved correctly is a huge improvement over the stock SFF-BP cartridge.
I think their statement is just a generalized copy-and-paste job from another bike's writeup.
And for those that wonder about appropriate spring rates for ride weight, see table below. Track riders tend to go up one spring rate from the one recommended because they care more about not bottom out the fork under heavy braking more than comfort. For instance, I weigh 175 but I'm using a 9.25N/mm springs in my forks due to mainly riding on track.
Spring Rate = Rider Weight (Including riding gear)
8.5 Nm = <165 lbs.
9.0 Nm = 165-185 lbs.
9.5 Nm = 185-205 lbs.
10.0 Nm = 205-225 lbs.
10.5 Nm = >225 lbs.