![]() ![]() How much preload? I used a similar heuristic as the one I learned for cup and cone hubs. Once you have the desired amount of preload, you would tighten the set screw. Once you insert the arm and tighten the fixing bolt, you should now set the preload. I read this as turn clockwise to increase preload.) (NB: mine is a 2020 DUB crankset, and it has a + sign with an arrow pointing in the clockwise direction. On my version, that means that if you are facing the NDS arm, you turn counterclockwise. Park Tools general page on BBs that use preload rings suggests that before you insert the arm with the preload ring, you snug it against the crankarm first. After you tighten the NDS arm's fixing bolt down, you would loosen the collar's set screw to prepare to adjust the preload. Then you tighten the NDS crankarm's pinch bolts, which prevents the crankarms from moving laterally.įor SRAM cranks, there is a plastic adjusting collar that the OP was referring to that sits inboard of the NDS arm. You put on the non-drive side (NDS) arm, then you tighten the crank cap to finger tightness. Modern Shimano cranks have a preload process similar to headsets. ![]() ![]() The technique I learned was to set the preload such that there was barely perceptible play off the bike, and zero play when the quick release skewer was tight. On cup and cone hubs, you adjust preload by tightening or loosening their locknuts. Too little preload can leave play (unwanted lateral movement in this case), which would also cause damage over time. This question dealt with a hub that the user suspected had been damaged by a skewer clamped much too tight. the bearings are getting squeezed inwards too much, that will damage the bearings and massively increase friction in the bearing. Preload also applies to your headset and to cup and cone hubs (and some cartridge bearing hubs). in towards the center of the bike) by whatever adjusting mechanism. Preload is how tight the bearings are getting squeezed inwards (i.e. I added a definition of preload to the terminology index under the bearings page, as this is a term that is frequently referred to but not clearly defined. ![]()
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