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Re: FM1001 / FM1156 - 135mm frame That is the rear pivot of a Horst link suspension. If that pivot was not there, you would stress or even crack the rear triangle as you engaged the suspension. The particular arrangement of pivots on a Horst link design also defines the axel path of the suspension as well as other important parameters.
December 26, 2021, 12:02:27 PM 		1
Re: FM1001 / FM1156 - 135mm frame You're seeing a few frames now using "flex stays" rather than these physical pivots.
The flex stays are designed to provide the small angular change between seat stays and chainstays that pivots also provide.
Bearing based pivots tend to still be used on longer travel bikes where weight is less of an issue than a light xc bike which are trending into the flex stays design.
People used to moan about bushings.being used in that application rather than bearings, but as there's often so little rotation there anyways bearings could be considered overkill
December 26, 2021, 08:04:36 PM 		1