Bottom Bracket

mrfuzz
Posts: 6
Joined: Sat May 26, 2012 7:50 pm

Bottom Bracket

Postby mrfuzz » Tue Sep 04, 2012 7:05 pm

Just wondering if anyone has had any issues with Press fit BB ( noisey .come loose)Are they any good .Have read some stories about them .some good .some bad.

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MarkG
Posts: 2147
Joined: Mon Mar 28, 2011 2:02 pm
Location: Perth, Australia

Re: Bottom Bracket

Postby MarkG » Wed Sep 05, 2012 10:44 am

Nope.
Press fit in theory shouldn't come loose.
Bearing cups press in (hence the name) with a Park Tools press, then the crank arms keep it there.
Are you sure the arms are squared up and tight?

As for the noise, winter time = sand and grit and rain, so maybe that's it?
Proudly "a hater of academics with helmet cams"

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rkelsen
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Joined: Mon Apr 20, 2009 10:41 pm

Re: Bottom Bracket

Postby rkelsen » Wed Sep 05, 2012 1:13 pm

Press fit BBs are a cost saving idea dreamed up by frame manufacturers who wanted to make more money per unit.

There is no benefit to the end consumer. It isn't lighter or more efficient.

From a user-serviceability standpoint, it is worse than threaded BBs.

Gordo
Posts: 124
Joined: Wed Jan 26, 2011 10:18 am

Re: Bottom Bracket

Postby Gordo » Sat Sep 08, 2012 8:44 pm

if i can avoid buying a bike with one i will. i want ease of servicability...especially on my mtb

mrfuzz
Posts: 6
Joined: Sat May 26, 2012 7:50 pm

Re: Bottom Bracket

Postby mrfuzz » Sun Sep 09, 2012 1:24 pm

MarkG wrote:Nope.
Press fit in theory shouldn't come loose.
Bearing cups press in (hence the name) with a Park Tools press, then the crank arms keep it there.
Are you sure the arms are squared up and tight?

As for the noise, winter time = sand and grit and rain, so maybe that's it?

Have not got the bike with press fit BB .I have a Trek with a BB90 in it.The BB 90 seems to be a very reliable & hassle free setup.
The press fit setup seems to to freak me out a bit.does not seem like a good setup.Might be just me

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MarkG
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Location: Perth, Australia

Re: Bottom Bracket

Postby MarkG » Sun Sep 09, 2012 7:31 pm

BB90 is press fit.
BB86 is the same thing.
Trek call theirs BB90.
What concerns you about it?
Proudly "a hater of academics with helmet cams"

mrfuzz
Posts: 6
Joined: Sat May 26, 2012 7:50 pm

Re: Bottom Bracket

Postby mrfuzz » Fri Sep 28, 2012 6:19 pm

MarkG wrote:BB90 is press fit.
BB86 is the same thing.
Trek call theirs BB90.
What concerns you about it?

My Trek has the external bearings threaded BB90.I;m probally worrying about nothing.

usernameforme
Posts: 977
Joined: Thu Jul 14, 2011 7:01 pm
Location: Adelaide

Re: Bottom Bracket

Postby usernameforme » Sat Sep 29, 2012 10:32 pm

rkelsen wrote:Press fit BBs are a cost saving idea dreamed up by frame manufacturers who wanted to make more money per unit.

There is no benefit to the end consumer. It isn't lighter or more efficient.

From a user-serviceability standpoint, it is worse than threaded BBs.


whats your issue? BB30 cranks and bearings are much lighter. They also give the rider more heel clearance, so they are lighter and for some, more efficient... whats your issue?

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