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Reviewed in the United States on January 27, 2025
Durable and works great!
JED
Reviewed in the United States on January 15, 2025
Smooth spin with no resistance once broken in. Installation was fast with the correct tools. Nice and silent as it should.
Nicholas A Nataro
Reviewed in the United States on September 7, 2024
Nice.
Rüdiger
Reviewed in Germany on July 29, 2024
Die Lagerschalen sind im äußeren Durchmesser kleiner geworden, was der langlebigen Funktion keinen Abbruch tut. Sieht aber gerade bei Stahl und Titan Rahmen besser aus.Die Qualität der Lager ist um jeden Zweifel erhaben!
Pirotte M
Reviewed in Belgium on July 19, 2024
Cadre aluminium monté en Shimano 105.Pas d'entretoises fournies montage compliqué sur cadre plus ancien !
Camp Runamok
Reviewed in the United States on February 14, 2024
I'm always surprised how reasonably price these are, and I'm also always surprised how much I can feel the difference when I put in a new set, so if your cranks feel a little slow while you are lubing your chain, it's likely time for a new set.
Alf
Reviewed in France on December 12, 2024
Parfait, convient parfaitement pour mon Gravel Specialized Diverge.
Douglas P.
Reviewed in the United States on October 11, 2024
What is there to say, it’s an Ultegra bottom bracket. Shimano’s work house. Perfect fit, light weight and looks great
Joel A. Soukup
Reviewed in the United States on October 23, 2023
I've been riding a lot this past year through some very wet New England weather. Although I'm pretty good about maintenance and making sure to dry off my bikes before putting them away, I started developing some annoying creaks in the drivetrain of my "do everything" steel gravel bike. After tightening and lubricating the pedals, crank, cassette, axels and chain, I was left with only one potential culprit, the BB. Fortunately, this model is inexpensive and a breeze to install. For such a cheap part, it really made a world of difference. My pedaling is now smooth and relatively silent again. Note that you will need a Hollowtech bottom bracket tool to do the install, which is unfortunately more expensive than the BB itself.
Big Motor
Reviewed in the United States on January 30, 2023
I was setting up a Zwift setup for winter training and decided to pull an old bike down out of the garage rafters to give it a new life and the thorough going over.She was put to pasture once I became addicted to Di2, carbon EVERYTHING, disc brakes, and tubeless tires. On another tangent, I've forgotten how wonderful metal is as a frame material. The feeling and feedback is something that's gotten lost in the match towards "higher tech". This bike will now be the rotation again, once the weather warms and I purchase a set of tubeless wheels ...some tech advancements are just too good to ever go back.Ok, back to my BB review...The part arrived rather quickly and I hadn't finished putting on the new cable housing and cleaning/lubing the drivetrain so this was out on the back burner, since I wanted to get the Zwift sled up and running ASAP.In time I got the Zwift thing down and got the bike dialed in on the (Zwift) hub, so though now I had time to pop in the new bottom bracket.I knew the original Ultegra BB was ok and still turned smooth after 15 years and thousands and thousands of miles, but I bought this new BB on a whim when gathering up fresh parts for this project. I saw how Shimano claimed lighter weight and a 50% reduction in friction, but we know how "NEW AND IMPROVED!", sells so didn't buy too much into the hipe. I opened the box and thought I purchased the wrong part because the BB threaded shell looked WAY too small compared to the old one still in the bike 🤔I fished around the box looking for the advertised adapter that's supposed to come with the BB so you can use your older took to install the new gen BB, but it was nowhere to be found, which is why I dinged the review on ease of install ... be warned, you'll likely not have the right tool to put it in if you're used to servicing your old BB.Once the correct tool arrived I swapped in this new one, put the bike back on the trainer and put on my kit for a ride.🤯 I couldn't believe how much LESS energy it took to power the bike! Shimanos claims of friction reduction are not hyperbole. I could see it on in the Zwift data too, I put out fewer watts over the same courses I'd ridden several times. Data doesn't lie, this thing was a huge improvement in efficiency and you can see it in the data. To add to that, it cleans up the looks of the whole BB area and makes it look far more modern.In closing, even if you don't NEED a new BB you need this for the friction reduction and sleek looks and ... IT'S CHEAP!!!Get it, you won't regret it other than needing to buy the tool to install it if yours doesn't come with promised adapter! 👍🏽
Customer
Reviewed in the United Kingdom on September 30, 2020
I got this when I realised that my ten year old Shimano Tiagra 4500 bottom bracket needed replacing. It is very easy to fit - just remove the crank, unscrew the old bottom bearing, and replace with this. There are lots of very good videos for this, I found the Park Tools ones best (you want the one for the BB with threaded shell, and the one for two piece crank removal).The only thing to be aware of is that this is a smaller diameter than the other (?older) Hollowtech II BBs - so you cant directly use your existing tool. However, this does come with the plastic insert that makes your larger diameter tool work - you just slot the plastic insert into your existing tool. Depending on the actual tool you have, it may or may not work. It didnt fit into the Ice Toolz or BT WIN tools I had, as the plastic insert was slightly too large in diameter. Other people have also said that it doesnt fit, but the simple fix is to file down the outside of the plastic insert until it does fit. Gentle use of a plastic mallet will help too.
Joseph K.
Reviewed in the United States on December 17, 2020
The part was pre-lubricated and well packaged. The reason I gave it a 4 rating and not 5 is because there was no assembly instructions included. NOTE: This is extremely important point to read prior to removing or installing the new bottom brackets. The right hand side is reverse thread! I wasn't aware of this until I reviewed a couple youtube videos. The fact the right hand side was difficult to remove lead me to further research this. I also recommend using the applicable spanner wrench versus a channel lock pliers because you risk damaging the paint on the bike with a channel lock.I'm happy with the part after installation. The clicking noise I heard from the old part is now gone with this new part. The old part was FSA Megaexo 24 mm (for Gossamer cranks) and I replaced it with this Shimano part. Reviews say Shimano lasts a lot longer than FSA and the Shimano part was a third less than FSA. The crank spindle is a little tight. I measured it and it was slightly over 24mm whereas the shimano bearing was slightly under 24mm. Given that I recommend using a rubber mallet and tapping the crank into place during installation. It went in fine but took a couple aggressive whacks to get it to finally seat.
gordon bettenay
Reviewed in Australia on October 7, 2020
As described, on time.
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