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BB30 conundrum - Advice needed urgently

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BB30 conundrum - Advice needed urgently

Old 01-27-12, 12:40 AM
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skeem
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BB30 conundrum - Advice needed urgently

I just got a brand new 2012 caad10 frame, and it comes with bb30. The problem lies with the fact I have sworn off bb30 for years (I have even told customers to put adapters in their bikes so they could still ride shimano cranks). I have always felt like the interface is more prone to making noise, and that the bearing seemed a lot more susceptible to road grit and water...

Now, as my bike is waiting to be built, I must decide between ordering a bb30 threaded sleeve, some adapters to use with bb30 bearings, or some sort of conversion bottom bracket. Id like to do this for as cheaply as possible...

AND (this is probably the biggest issues) I also am married to the Chris King bottom bracket. I have one on all of my bikes an I have the grease injector tool and its awesome. My one bb has given me 20k miles of awesome service and its running as smoothly as ever. I have found no flaws in it whatsoever- maybe some drag with the seals, but it oh-so-smooth.

The question is: is a bb30 adapter setup with 7800 cranks a better option than a threaded sleeve with a King bb? im not 100% concerned about stiffness because when i race i try to be around 135-140lbs so it may not make a huge difference- i also could be wrong and it may make a HUGE difference (please inform me). do bb30's really weight that much less? also, im trying to keep weight down (im "upgrading" from a $3000 carbon frame to a caad which will cost me a tad over $300), would a bb30 shim setup be that much lighter?

Im on the fence here. if you love bb30 adapters tell me why, or if you think "less" stiffness and the 60 grams weight of the threaded adapter is a reasonable penalty to pay for use of a King bb inform me. thanks.
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Old 01-27-12, 01:03 AM
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I recently built up a frame and it had the bb30, and I already had 6600 cranks. It got the wheels mfg. adapters (they're made out of delrin, it feels like a hard plastic). so i tapped the bearings in, fully greased, and feared the problems I've read about. However, they work well (bb30 and adapters). I like them. If the bearings get crazy on me, I'll do the kcnc adapters because they're not pressed in or get bb30 bearings if there is such as thing as good quality ones.

The point is you can spend about $20 or so on the wheels mfg. adapters, and try it out. I don't know right off the bat how much the adapters weigh, but they're surely lighter than a press-in adapter plus the the weight of the threaded bearings. If you don't like it, go with the press-in adapter and the King bearings; then you can pass the wheels mfg. adapters along to someone else. Heck, they just slip in! Easy install. HTH
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Old 01-27-12, 08:37 AM
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das Ben Gator makes a great point about using the wheels mfg. adapters and trying them out. Quick, easy, and cheap; and will allow you to use the crankset you already have in mind.

As for using the threaded sleeve, I've seen pro riders' bikes set up with this, using threaded, external bearing bb cups into the sleeve. The problems I have with the sleeves are: a. you've purchased a BB30 frame and you're going to use a threaded sleeve (read kludge) and install a heavier bb design (threaded cups) on top of that.........b. according to the instructions I've seen for the threaded sleeves, they are a permanent alteration, not to be removed later. On the plus side, it sounds like you just really don't like the BB30 design and perhaps the bearings themselves. The only way you're going to get away from the BB30 system entirely, and still use this frame, is to install the threaded sleeve. Otherwise, you're still going to be using BB30 bearings.

Personally, I'm liking my new carbon-framed bike with PressFit 30 bearings, Wheels Mfg adapters, and 6700 Ultegra crankset. You may already know this, but PressFit 30 is a system that some frame manufacturers are going to in place of BB30. It has a larger bore in the bb shell, and nylon-encased BB30 bearings. BB30 cranks work with PressFit30 without adapters. So you use the same adapters you would use with BB30 if you want to use a crankset with 24mm spindle (such as a Shimano crank), for example. No problem with mine so far, it's smooth and quiet. And I can still use cranks with a 30mm spindle if I choose to later. FWIW, the stock configuration of my bike, from the factory, had the adapters already installed, using the Shimano cranks. I'll also say this: the first time we installed a 24mm crankset in a BB30 bike for a customer, using the Wheels Mfg. adapters, I was skeptical. That bike belongs to a big guy (like 6'4") who races the bike, but he's had no problems with it.

No perfect solution if you want to use that frame and get away from BB30, but I hope this info helps.
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Old 01-27-12, 11:09 AM
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^^ I kinda just hate the bearings, I guess. If they all lasted a long time and stayed smooth and noise free it may be different. i am not thrilled by the fact that BB30 puts the bearings back towards the center of the bike (where not 6 years ago having them EXTERNAL was the new thing)- Thats where I think BBright/PF 30 are better, but Im not a fan of the crank selection etc etc- its too hard to know which ones spindle is shorter/longer and which can work with which bb etc. I am also not a fan of the seals on bb30 bearings, as they are almost nonexistent. i know external bearings have drag, but they stay clean and sealed quite well (I rode mine under water during the post- Irene floods here in Philly for a few mines and it is still fine).

Lastly, I just hate the damn price of the adapters. Its like $18 wholesale for a piece of plastic! PLASTIC!!! I can buy an external bb for that much!
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Old 01-27-12, 11:26 AM
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Originally Posted by das Ben Gator View Post
........ It got the wheels mfg. adapters (they're made out of delrin, it feels like a hard plastic). ....... HTH
That has to be a joke. Look up Simplex (exploding) derailleurs from the 60's and 70's if you don't know what I'm referring to.
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Old 01-27-12, 01:17 PM
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Originally Posted by Ex Pres View Post
That has to be a joke. Look up Simplex (exploding) derailleurs from the 60's and 70's if you don't know what I'm referring to.
It's no joke, FWIW. Wheels Mfg. describes the adapter material as "engineering grade Delrin."

P.S. Just to correct myself in my earlier post, there are two different part numbers for the Wheels Mfg adapters, in regard to PF30 vs. BB30. There's a slight difference in the shape of the adapters, they're not interchangeable.
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Old 01-28-12, 12:30 AM
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A couple of things to note: Someone mentioned above that the adaptor sleeve is permanent, but we've removed a couple in our shop without too much trouble (the method is to partly screw in an old, dead, traditional cartridge BB and whack the end of that with a hammer until the adaptor sleeve comes out the other side of the frame - we've managed to do it without damaging any frames so far). However, I've also briefly used the BB30 bearings with a 24mm adaptor setup on my personal bike for a short time while I was waiting for a new crank to arrive. It worked flawlessly for me, but I can understand your dislike of the sealed, unserviceable bearings that you must use with that setup.

IMO, the difference in crank stiffness between oversize BB axles and standard size is not important to anybody but the most powerful riders - the old setup is plenty stiff enough for most of us. There is a small weight gain with the OS axles because they can be made of aluminum instead of steel, but I'm not convinced that is a good enough reason for giving us compatibility issues and making many people having creaking BBs.
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Old 01-28-12, 07:39 AM
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Originally Posted by skeem View Post
^^ I kinda just hate the bearings, I guess. If they all lasted a long time and stayed smooth and noise free it may be different. i am not thrilled by the fact that BB30 puts the bearings back towards the center of the bike (where not 6 years ago having them EXTERNAL was the new thing)- Thats where I think BBright/PF 30 are better, but Im not a fan of the crank selection etc etc- its too hard to know which ones spindle is shorter/longer and which can work with which bb etc. I am also not a fan of the seals on bb30 bearings, as they are almost nonexistent. i know external bearings have drag, but they stay clean and sealed quite well (I rode mine under water during the post- Irene floods here in Philly for a few mines and it is still fine).

Lastly, I just hate the damn price of the adapters. Its like $18 wholesale for a piece of plastic! PLASTIC!!! I can buy an external bb for that much!
bbright is wider but pf30 is the same 68mm width
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Old 01-28-12, 09:48 AM
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Originally Posted by reptilezs View Post
......pf30 is the same 68mm width
+1. The Wheels Mfg adapters we're discussing not only serve as a shim for the 24mm crank spindle to be used in the bearings designed for a 30mm spindle, the adapters also fill in space between the bearings and the crankarms (the same space that threaded external bearing cups would take up).

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Old 01-28-12, 02:39 PM
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as an orthodox cyclist I cannot condone the combination of a BB30 frame with a non BB30 bottom bracket...it is just wrong....
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Old 01-28-12, 03:37 PM
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Heresy they told me to avoid it in seminary

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Old 01-29-12, 01:58 AM
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BTW, as well as the Wheels Mfg model, there are also other makes of the adaptors. Specialized now include a pair with every new road frameset, which look slightly different from those shown above. So ask at your local Spec' dealer, they may be acquiring many more than they have need for.
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