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BB30 Creak!


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Old 07-17-2017, 01:11 PM   #31
superj
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dang, that sucks.

I never had a press fit but I will definitely look to make sure I don't get one in the future. since recumbents seem to last so long, I might not really have to worry about it because the next bike I get will be a lightning p-38 and that will probably be it because I am not buying an f40 because its carbon fiber.


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Old 07-17-2017, 06:44 PM   #32
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Quote:
Originally Posted by Merlincustom View Post
Nothing beats a threaded bottom bracket. Some things just can't be improved upon.

100% in agreement.


So I pulled the crank today and the problem is just what I thought it would be. The Hawk Racing PF 30 is also made for 68 mm BB shells. Instead of the connecting tube being pressed all the way against each cup to stabilize it and make the installation more rigid, it's just sitting on the edge of the cups not doing much of anything but keeping dirt off the spindle. So when torque is applied to the BB, the cups have nothing to stabilize them which allows them to move from side to side, thus causing the creaking sound.

So you would think that the manufacturers of these bottom brackets would keep up with the times since more and more bikes are being made with oversized BB shells for greater stiffness. On the other hand, you would think that the bike manufacturers, knowing that PF 30s are 68-73 max shell width, would use a different BB style in oversized BBs. 🤡🤡🤡


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Old 07-18-2017, 12:56 PM   #33
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so folks with cannondales and BB30 bottom brackets (like myself) have been fighting this for ages now (almost 10 years).

while cannondale recommends loctite 609 (the green stuff) between the shell and the outer bearing races, more people find success using Loctite C5-A copper based anti seize in that location.

I know I had the same issue on my CAAD10 after around 1500 miles, had the shop replace the bearings using the original FSA ones and use C5-A and the creak hasn't come back after 2500 miles. 4000 miles total on the original bearings

it's worth a try before dropping $100+ on an adapter plus a new crank.
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Old 07-18-2017, 06:09 PM   #34
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Quote:
Originally Posted by Merlincustom View Post
Nothing beats a threaded bottom bracket. Some things just can't be improved upon.
Agreed it stinks almost every brand is running some sort of press fit. The claim is a wider shell makes a stiffer faster bike but it isn't worth it for us who don't have pro sponsorship.
Like mentioned the locktight works on some bikes. BBs that thread together help but don't always fix it. The harder you ride the more likely to have the issue. Or just bad luck because some bikes do it worse than others.
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Old 07-18-2017, 06:41 PM   #35
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Quote:
Originally Posted by Merlincustom View Post
Nothing beats a threaded bottom bracket. Some things just can't be improved upon.
The sad part is that bike manufacturers did not promote the pressfit BB because it was an improvement over the threaded bottom bracket. They did it to lower their manufacturing costs because PFBB has less demanding tolerances. They tried to say that it's stiffer and all that but I don't buy it.
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Old 07-22-2017, 08:01 PM   #36
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An update on my BB issue. Somewhere, in one of the magazine reviews of the CRS, it stated that it had a PF30 bottom bracket. All the other reviews on the CRS and on Colnago's web site say it has a press fit BB. Well, I've been going on the assumption that it has a PF30 since I read the article and have been pretty pi$$ed that Colnago would make a bike with an oversized BB shell and put a PF30 BB in it. So when I saw the inside of the BB, when I pulled the crank, it made me even madder. Well, come to find out, when I asked my mechanic at the shop about this, he informed me that I actually had a PF86 and not a PF30. Well, that made me look pretty stupid! So, since Wheels Mfg makes an aluminum threaded PF86 BB, I ordered one and it came in yesterday. He's going to see if the bearings are interchangeable so I can keep the Hawk Racing bearings but if not, the Enduro Angular Contact bearings are said to be at the same level as the Hawk (or pretty darn close). I'll pick up the bike on Monday and will be riding the Ace until then. I rode the Ace on today's ride and it was so nice and smooth and quiet; thanks to the threaded external BSA type bottom bracket that is so much better than press fit.
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Old Today, 06:54 AM   #37
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Update on my situation...

FSA is saying it is frame related and Kona is saying bearing. Basically nobody wants to warrant it, so I will be getting it repaired on my own. I have a BB at the house, I was just hoping that the company would stepup as it is really is a new purchase. That being said, I have zero confidence in the place that I bought it and I don't really recommend Kona at this point if that is how they are going to treat customers.

I like the bike, but if this bearing nonsense continues, I will find a better solution or get rid of the bike.


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