light weight, reliable

square taper

I purchased this because it is light weight and it has the grease guard feature for servicing. Because this bottom bracket allows you to adjust chainline, it took me a while to get the set up dialed in when I installed it. Several times I had to remove the cranks and adjust the cups so I could get things centered. Shimano bottom brackets are easy, but they don't provide for fine tuning either. Once installed, I have not had to touch this thing...no creaking, no relubing, no play, nothing. That is what I want in a bottom bracket. Plus it's a bonus if it is light weight. It would be ideal if this had an Isis crank interface, but I bought this because I didn't want to replace the cranks I already have (which have a square taper). One last thing to note, I had to rig up a "seal" for my grease gun to allow me to inject grease. It would be cool of these came with a hollow crank bolt that had the grease guard zerk in the end, that way you could service the bottom bracket very easily.

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shimano

Light

Bearings are shot within 3 months.

Dont get this pc of crap....light but not durable enough.. only if you feel like rebuilding them after every 3 months then go for it, but for the price, not for me.

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Used XT BB for years no problem...

light weight, service

relies too much on BB shell of frame for stiffness
won't stay tight

This design is nice and lightweight, but it seems to rely too much on the frame's BB shell for stiffness. I installed this thing over ten times in my bike. No amount of loc-tite, grease, tape, torque, etc could keep this thing from creaking after the first ride. Poor customer support too. I got a regular stressed-shell BB, a race face Chromo, and have had NO creaking since. No amount of weight savings is worth rebuilding the drivetrain every other ride.

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shimano, race face

Light, Light, Light, did I mentioned its very light.

bearings went out within less than a year.

I've noticed a grinding feel after about 6 months of using, I only ride on weekends and I have 2 bikes, so that being said I dont use this bike bike often, Its actually my cross country bike, no jumping no abuses here. I followed the direction on rebuilding make sure you follow all directions, and all hell came loose, bearings were all over the place, drive shaft bearing cup was a nightmare to come off. So keep this in mind its not as durable, very expensive, hard to rebuild and often it needs, and finnaly did I mentioned its very expensive.

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shimano, bontrager, race face.

Light weight
adjustability
old school flavor for new school fools
Greasy ports

expensive
square tapers soon to be history

The adjustability of this Bottom Bracket allows you to use it with E-type Front Deraliurs (ie lock rings on both sides) the design of this BB hasn't changed in years( ie proven design) Use locktight on the cups to keep them in place as the directions suggest. Happy railing.

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every other bottom bracket you can think of

Yow! This thing is super light! It can be freshly lubed in about 10 minutes without getting your hands dirty! Bearings are easily replaceable, and it's adjustable too. Yow! This thing is SUPER LIGHT!

Uh, um... it's not for grease fetishists. If you like to get greasy, get one that needs to be taken apart to re-grease.

This BB is light, cool looking, easy to service, and basically the shiz-nit. Buy it, and revel in your newfound lightness and upgrade to full bike-weenie status. Let's face it... if you're buying a product because it's good, even if it's "invisible" on your bike, you're one step ahead of all the folks buying purple anodized brake levers and those stupid machined pulleys. This thing rules.

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Shimano BB's, LX & XT.

Light weight. Virtually indestructable.

You have to maintain this product. So if you are the lazy type, maybe this is not going to suit your needs.

I bought this as part of a weight reduction program for my bike. At 143 grams per the digital scale, I feel this qualifies as light weight. This product also holds up to the rigors of riding wet and muddy conditions for 6 months of the year.

I replaced my Shimano BB with the AC model over a year ago, after wearing out the bearings on my old one. It was one of the lightest bottom brackets I could find, and the titanium stands up to anything I can dish out. It was very easy to adjust the chainline when I installed it, and I haven't had to mess with it since. The bearings are very smooth, and lubrication is a lot easier than with the Shimano. I tend to be hard on my gear, and I expect it to last. This bottom bracket hasn't let me down.

Don't get a new bottom bracket just because you think it's cool.
I only got mine because my old BB died and this was available.Compared to a Shimano BB, the American Classic _can_ last a whole
lot longer, as long as you keep after it.
The spindle is hollow and has allows you to inject grease without
dissasembly. It's very similar to WTB/Suntour Grease Guard except
that A.C. expects you to remove the crank bolts every time you shoot
up (as if). Just get banjo bolts at your local hardware store or
scrounge up some old WTB hollow crank bolts with the grease port built
in.The biggest negative is flex. Titanium bottom brackets are flexier
than steel. Period. There's no escaping the facts. Fortunately,
I don't mind it. The good part is that after a year of very hard
riding, racing, and trials with a 170# rider the bottom bracket
is unbroken. That's pretty darn good performance for such a
lightweight part.The bearings are very nice, and standard size for easy replacement. I've
had mine for over a year on the first set and they're still good, though.
Another neat feature is that there's an ajustable cup on BOTH sides. You
can fine tune your chainline any way you want.

After going through over a half a dozen bottom brackets in the past couple of years this is the first one that I have had no problems with. It's chainline adjustibility is also a great plus and its weight is also a bonus. For the money this seem to be as good as any other on the market.