Most carbon bike frames are a bit messy inside, especially in the bottom bracket shell area. This is because the layups that make up a frame bottom bracket shell are rather complex, with many intersecting overlays of varied thicknesses and compound areas of convergence. And it's all hand done. So, in the end you get what looks like a beautiful, well-kept construction, but inside you see what looks like the aftermath of a weeklong frat party. When one is installing a BBInfinite 1-piece, hub style pressfit module there's some tidying that must be done to ensure the install goes off without a hitch. Thanks to Matt and the whole crew at Spokes Giant Little Rock for letting us try out this amazing 2021 Giant Revolt AXS. Loving every minute if it!
There are some unique aspects of putting in a one-piece bottom bracket which differs greatly from putting in anything that's two-piece because it needs to pass all the way through the frame. I'm going to show you one of the main considerations. We've done videos like this before but this one is the comprehensive videos; we will show you everything. So come on in here this is the number one thing we need to look for make sure there's no obstructions that can't be moved out of the way of course this line can be moved out of the way we've covered that in some other videos we'll go over that again in just a second and then what we want to do is we want to use our ruler test to come straight across and make sure the ruler doesn't like teeter totter on some something that is sticking up in the way and of course the biggest thing we want to look for is see around here all this like this edge you can hear it look at this I mean you need to remove that because if you see how the bottom bracket looks the front edge see this right here as this is passing through okay and from one side to the other it's going to get caught on this this edge right here would get caught on this and want to fold that up and over because if this piece got folded up in there between the press fit area the bottom bracket and the same contact surface on the frame the bottom bracket would jam in there becoming so extremely tight and the bearing wouldn't spin and you have to knock the bottom bracket back out and come in and clean that so what we want to do clean that up with sandpaper or a dremel tool put a nice chamfer on it all the way around on the inside so the bottom bracket can just ease right on through without any trouble time for the after come on see this is what it's supposed to look like before you install it see how it's clean all the way around here got this nice piece of closed sole foam in here pushing that brake line up to make sure it's not going to rattle on the bottom bracket should be nice and clean chamfer on the periphery so when that bottom bracket comes through no obstructions no problems
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