DJC Bike Ceramic Bearing Bottom Bracket BSA 68-73mm English Threaded BB 24mm Spindle, Fit MTB Road Bike Hollow Deore XT SLX R7000 R8000 4700 5800 6800 IXF Prowheel(Ceramic 24-24mm Black)

Clean install, everything was as advertised, good craftsmanship overall.

If you are using the bb aluminum sleeve the total width measurement is 73 mm. So you do have to use all the spacers if you have 68mm bb shel on your bike . So it is not going to fit your road bike without the spacers. Or you need a longer crank axle for your road bike. So either you don’t use the sleeve ( no water protection) or longer axle. Right now I use it without the sleeve. And it makes crunchy sound without the metal sleeve. Maybe it’s my fault but definitely not for 68mm bb shel .

Really surprised with the smoothness of these ceramic bearings given the price point of this BB. I've been happy with the performance so far. However, the collar is made of metal, compared to the nylon collars used in Shimano branded products, so it is a bit heavier

Great high quality BB. Feels like a wheels manufacturing withou the price tag.

Well Sorry to say I am very disappointed there is no way this will fit on a 68mm bottom Bracket when it comes out the package measuring 75mm.

I ride vintage, I am a finisher and not a podium finisher. Maybe I can attempt a 70.3 or a century, but a newer bike isn’t putting me on the podium. And bottom brackets get crusty with time and need maintenance or replacement. The Shimano BB (spare) technically isn’t serviceable (stamped "Do Not Disassemble") and has been replaced at least once because I currently am using an FSA BB. Sometimes the “easy” button is replace that thing instead of watching videos and ordering different bearing cartridges to try and service something Shimano won’t tell you how or what parts nor sell you the parts.With multiple bottom bracket standards, you start with the frame. Mine is BSA threaded, as is this bottom bracket. My bike is 68-mm shell width; buy per your frame. This is a 73-mm shell width and comes with spacers to fit the narrower frame; I went slightly easier and simply installed the new bearing cups into the old shell and threw away the spacers and shell. The new shell is aluminum, the original shell is plastic, but they match up OK and save me some trouble dealing with the 68-mm shell width.Next is spindle diameter, the Shimano 7800 crankset is 24-mm spindle (I suspect this is a Shimano standard, and maybe FSA as I am currently using an FSA BB?). All dimensions match up, it installs easily enough. I didn’t worry about facing the frame with installation, and I used anti-seize on the threads. And hey, ceramic bearings are the hotness – right? Granted they are in steel races (hybrid), so ceramic is kind of marketing here and probably trying to sell you an upgrade when steel bearings are fine. Also these appear to be serviceable bearings, I popped one out of the cup; meaning you can repack these in the future or potentially measure and replace just the bearing cartridges themselves.I wish I could tell you this saved me watts, or that the ceramic bearings reduced friction, or that I am faster. But truth be told, you can’t compare a new bottom bracket to a crusty worn-out bottom bracket and come to conclusion that this is better than the Shimano (or FSA) equivalent. I don’t ride power meter either, at the age of my bike those power meters were pretty questionable compared to today’s technology and again anything that vintage is long since worn out (e.g. SRM 7800). But this gave me a new bottom bracket for a vintage and obsolete crankset, and likely using superior materials than what I removed. And let’s be honest, Shimano hasn’t put out a group set quite as stunningly gorgeous as the 7800 despite their updates; that thing is pure jewelry compared to anything since. For that, I win…

I installed this on standard 68mm wide BSA threaded road bike (Canyon Ultimate CF SLX). The bearings are super smooth though there is no way to tell if it is ceramic or steel. I am going to trust and say they are indeed ceramic from the way it spins.However and it is a big however, the cups/inner tube may be too wide for 68mm BB shell.Here is what happened -1. Standard installation procedure for 68mm BSA BB is two 2.5mm spacers on drive side and one 2.5mm spacer on non-drive side. If you do this with this BB, the spindle of the crankset does not protrude enough from NDS to attach the crankarm securely.2. If you remove spacer from NDS, the cup still does not go further in - the inner tube length prevents it from getting any further. Meaning you MUST install a 2.5 spacer on NDS.3. Which means you cannot have two 2.5mm spacers on DS. If you do install two spacers on drive side, the front derailleur cannot handle the extra width not to mention you cannot even install the NDS crank arm.4. The only way to make this work is installing only one 2.5 spacer on each side. Even then the NDS crankarm barely gets attached and you have to overtighten the plastic preload center screw of standard Shimano HT II crankset, in my case it was Ultegra R6800.5. I will keep an eye out for NDS crankarm since the spindle barely inserts into it.6. As I was installing the crank from drive side, the NDS bearing came out from its housing. It can be pushed inside again pretty easily but I had never had bearing come out from any bottom bracket ever like this.Aside from this, the crank spins pretty smoothly and on my first and only ride of 40 miles on this BB there were no sounds, creaks or any other issues noticed.Overall though, I am not very pleased with the installation experience. It might work well with 73mm BB shell but for 68mm, its too wide. That and the bearing not securely housed has me worried.

As long as this is ceramic bearings, I'm happy. Usually these will cost 3/4x more than this one for "ceramic bearings" which are usually a marketing gimmick anyway. I got this to test if I can tell the difference between a cheap name brand bottom bracket vs "ceramic" bottom bracketTime will tell. And I will update this review accordingly! So far so good though, hence the 5 stars.