The same negative and positive preasure does not mean the same force. This is what the fork designers were going for for years - getting a bigger negative chamber and making air forks softer on beginning the travel - and now we are reducing the negative again? Was it too big? Which means the fork goes more easily further into travel in the beginning. The only difference I see here is, that on 140 mm fork without upgrade, when it's in 130 mm travel with equalized preasures, it has a bigger negative chamber, because there is not the bigger red sealhead - there is 10 mm of free space. When I don't do that upgrade but change to 140 mm travel instead, I get the equalized preasure in the same hight - 130 mm (140 minus 10). When I get the upgrade, I move the piston higher, so I meet the dimple - so I have equalized preasures in the beginning of the travel - in 130 mm. What is a difference for me between this upgrade and changing travel to 140 mm without the upgrade (except the upgrade is a little cheaper)? I mean - without the uprgade, the equalizing dimple is a bit higher than the piston - let say 10 mm - so the equalizing point on 130 fork without upgrade is on 120 mm - the point, where I get the same negative and positive preasure. If I feel sitting too deep in the travel - I see two ways how to get higher: I can get this upgrade obviously - or - get a 140 mm airshaft and continue sitting deep in the travel - but overall 10 mm higher.
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