Bottom Bracket Selection Guide
Trek BB92 Trouble Part 3: How Hard is Too Hard To Press?
In this vid we're pressing a gorgeous 1-piece, hub-style BBInfinite BB92 bottom bracket module into a freshly shorn to 40.98mm Trek Supercaliber frame shell. We discuss some real gravy here regarding some nuances, ins-and-outs, dos-and-don't, so watch the whole thing. Keep an eye out for Vids 4 in this series and here's the link to: Vid-1: Getting the Dang Thing Out Vid-2: To Ream, or Not to Ream
I always begin by going ahead and getting the module sort of pushed in there a little bit can already tell the fit is going to be very nice as it ought to be and I set it up with our 4030 die so it's as I said before in videos and I'll say again and again and again you never want to use anything to install a bearing that pushes on the inner race unless you're installing it on a shaft when you're installing it into a bore where the outer race is what is going to be being held captive you want to push on the outer race okay so I'm going to go ahead and get this thing just hand started just like that and I'm going to go ahead and press it in and we got a really nice just even drag you know and I always and you know what you can also do I'm not going to do it for this video but when you get it just pressed in there where that first bearing is completely contained within the frame so you know the frame's influence is now on it if you have any questions about how the how the frame is and you don't have the measuring equipment all that you can actually take the take it apart right now take the press out and while the module's in there and reach through from the other side and feel the bearing with your finger and you're going to get a really good indication of what your final outcome is going to be once it's pressed all the way in so I don't know it says little intermediate checks that you can do alright, so at this point you can- i can just push it straight through to the other side what i'm gonna do and a lot of guys at this point they're like home free they're just gonna put it like this and they're gonna tighten it down and they're going to keep driving no no no no no we're not going to do that we're going to do what's called our mid-drive inspection and ad nauseam I do this stuff all the time I'm going to show you that in just a sec all right so for our mid-drive inspection you see there's like a lip inside of here what you don't want is you don't want the module to get stuck on that lip and then you start trying to press it through and the module is actually crushed up against the inside of the frame like there see that that could that would be bad you want to actually feed it all the way over and start it by hand and then check all the way around to make sure that the nose of the module is clear and coming actually coming through the frame cleanly all right let's keep going we're going to put some retaining compound okay had I not reamed this frame out I would have to stand on this thing right now I would be giving it all my might this would be trying to spin I'd have my buddy over here holding on to it and uh there'd be some prayer and some consternation of course you can hear that noise as people who are fans of these videos know that is the Loctite or in this case Vibra-Tite530 is lighting off and you see we've got the module flange has touched on the bottom there's a slight gap at the top that's okay that's just the way this goes all right give it a little snuggy snug and it might have a little gap on one side the reason for that is because this frame shell uh is not square okay it's not square like this it's been kind of it's kind of like this a little bit so our module is all one piece so the flange is not going to conform to that because it's going in straight perpendicular through here so when it touches in one spot it's done all right this is actually really cool I've done a post about this recently it's really cool to see when the module's like that if this was a two-piece system whether it's screws together or whatever which the screw together ones have play in them they can actually conform to that or a two-piece system it will conform to this out of square state and what you'll end up having is bearings that are in there at an angle and then we try to put the spindle through there you've got one bearing at one angle one bearing at the other angle spindle's trying to make them both run straight and that's why those bottom brackets don't spin in the next video we're going to install the crank
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