In this video we ream the carbon frame shell to ensure it is the golden 40.98mm dimension. The perfect fit is necessary for optimal bearing performance so you can put every watt to the ground. In this series we are going start to finish on a Canyon Aeroroad CF SLX disc Di2 bottom bracket install. We're spending a lot of time on BB86 and BB92 because they are prolific AND because we see more out-of-spec bb shells in bikes featuring this format than others. Fear not, there's a method to what may look like madness at first. Enjoy Here's the other vids in this series: Vid 1: Reaming a Carbon Frame Shell:
You guys have seen me use this ream in past videos when I was going and reaming out an alloy frame an aluminum frame to be exact and I want to show you guys that you can also use this on carbon. Now it can be kind of hard on these blades over time the carbon that is and it can dull them. And of course, they're easy to sharpen again. Now you've seen me in the other video, this is the exact one we used before, so we've already checked the dimensionality of this, and we know that it is 40.98, 40.97. And that's what our goal here is okay so you can use this we use this routinely in our shop. Oh, before I show you that, take a look inside here. You'll notice that I went ahead and took some closed cell foam okay obviously closed cell foam, so it doesn't soak up a bunch of water and leave a smelly mess inside your bike. This is just getting the Di2 wires and in this case the hydraulic brake line for the rear caliper gets that all pushed up and out of the way. So I don't accidentally catch one and cut it up with this ream now, once again this reaming procedure you've seen on other videos want to go ahead and set it. Give it a little bit of preload right here you'll notice that I didn't put any tap magic or anything else on here because all I'm going to do is I'm just going to run it in there and just to basically clean it up and check it. Alright this is going in there just fine so it's not taking off a lot of material but that's fine but we know that it's going to give us a nice 40.98 hole when we're all done some of these frames not necessarily the Canyons because a Canyon seems to be really good with their dimensions a lot of these can cause us some difficulties so yeah you can use the ring it's always loud you can use the ream to go ahead and finish these holes to make sure that the right size now. Take a look here, not a lot of material came off right there as you can see. But it's just enough and it's a good idea to ensure that it's the right size before we go putting a bottom bracket in here and then only afterward going "oh wow that was too tight". It's easy to fix it on the front end
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