Thats not 100% true in all sincerity. The production spec of that TTX36 rear is lower spec at the request of Triumph as the bike manufacturer to meet cost ceilings. Unlike the aftermarket TTX36 it lacks an internal top out spring, it also lacks an external ride height adjuster, something that you really should have on a race bike. It also lacks a hydraulic preload adjuster, substituted with lower cost castellated lockrings. If it had all that stuff the bike would be more expensive.
There are 2 very solid advantages with properly designed hydraulic preloaders, as follows;
1) Very rapid ''in and out of'' pitlane spring preload changes. You can establish the effect of changes within short, compressed practice sessions.
2) The ''rock'' in the interaction between the fixed and moving spring push parts compensates for spring untruth. No spring is square! Or even if they are dynamically they place huge side thrust loads that wears bushings / piston rings and magnifies friction. If you can in part compensate for that the friction reduction and therefore shock response can be significant.
I have a couple of year 11 GSXR600 oem rear shock springs here and the difference in height when measuring opposite sides is over 2mm.
The NIX30 cartridges are also not quite the same as the aftermarket ones. The stuff will still work way better than the very dire lower spec stuff they fit but it still needs work to bring it up to racetrack performance and quickness of adjustability standards.
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