Threaded or Press Fit?
#27
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The design looks identical to the more popular T47. Just a smaller shell diameter. I wouldn’t touch it with a 10 foot pole unless I knew I could get my hands on the threaded cups. Then I’d press my own bearings in. It seems like only ceramicspeed sells a complete T45 or threadfit 82.5 BB at the moment. I doubt that will change anytime soon.
I also can’t tell if there’s a difference between a shimano threaded cup and a DUB/30mm threaded cup. Because if they are all using the same cups, a Shimano BB86 bottom bracket has a 41mm OD... but a 6806 bearing for 30mm spindles has a 42mm OD. I’d definitely get in touch with colnago or just bite the bullet and get the ceramicspeed
I also can’t tell if there’s a difference between a shimano threaded cup and a DUB/30mm threaded cup. Because if they are all using the same cups, a Shimano BB86 bottom bracket has a 41mm OD... but a 6806 bearing for 30mm spindles has a 42mm OD. I’d definitely get in touch with colnago or just bite the bullet and get the ceramicspeed
#28
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I have had both and properly installed, PF BBs are fine. My first time with one of these wasn't as good but all it took was using he correct loctite and primer. My Look 675 had BB85, my current Cervelo S5 has BBRight and I made sure to buy the Loctite and primer myself and let the mechanic know to use them (at this point I won't assume that any mechanic knows wth they're doing due to some bad experiences) and it's rock solid. YMMV.
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Most, but not all. BB90, in particular, has few options because it's pressed directly in to the frame and made with the smaller 24mm spindles in mind, so those two limiting factors back you in to a bit of a corner. There may be some thread-together aftermarket solutions, but the bearings would probably have to be a bit undersized to accommodate the dimensions.
All that said, I have a Trek with BB90, it's been fine, I have confidence in their lifetime warranty (for the original buyer) and it wouldn't keep me from buying something like a Madone, if I were in the market.
All that said, I have a Trek with BB90, it's been fine, I have confidence in their lifetime warranty (for the original buyer) and it wouldn't keep me from buying something like a Madone, if I were in the market.
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#33
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If I was looking at several bikes then any form of pressfit would be the deal breaker, when looking for my wife's MTB several were ruled out just on the basis of PF. If its a deal with no comparison, well that's how I now have several forms of pressfit. My gravel bike with full Tiagra and nice everything was only 500 shipped, would not turn down the bargain, also just replaced my road frame and the replacement is bb86 but at 200 for a carbon frame and fork I didnt complain while pressing in the BB. So far in 3 years I've had to replace one of 4 pressfit BB, though in the same span I had to replace a square taper threaded BB in which one side just cracked apart and it isn't the first time I've done that.
#34
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My ideal BB would be 68mm T47. Threaded, and it'll take a BB30 crank.
Remember heel clearance?
Remember heel clearance?
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#35
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Threaded vs PF is only 1/2 the issue. Many BBs have metal to metal contact between the axle and the bearing, and that interface needs some slop to accommodate assembly. That in turn makes for one more creaking interface and for the bearing wearing down the axle in case of alloy. Shimano HTII + sleeved PF or BSA eliminate the particular issue and has a steel axle.
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Threaded vs PF is only 1/2 the issue. Many BBs have metal to metal contact between the axle and the bearing, and that interface needs some slop to accommodate assembly. That in turn makes for one more creaking interface and for the bearing wearing down the axle in case of alloy. Shimano HTII + sleeved PF or BSA eliminate the particular issue and has a steel axle.
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Threaded vs PF is only 1/2 the issue. Many BBs have metal to metal contact between the axle and the bearing, and that interface needs some slop to accommodate assembly. That in turn makes for one more creaking interface and for the bearing wearing down the axle in case of alloy. Shimano HTII + sleeved PF or BSA eliminate the particular issue and has a steel axle.
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I guess the original BB30 advertised a narrow Q-factor as a positive, but I think in general it's agreed that puts more stress on the bearing to shell interface so now the press fit are spaced out more like traditional external cartridge BBs. Meaning not all press fits are created equal.
scott s.
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scott s.
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The PF BB, with threaded BB shell, is as tight, light and trouble-free as any I have used. This is my favorite. OT, but I can blow (lungs) these cranks into a spin with this BB.
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Before the clincher/ tubeless wars and the disc/ rim wars, this was the holy war in the 41.
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#43
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I believe that a lot of the resistance to PF is that it requires significantly more specialty tools to remove and install vs. a simple notched wrench or socket for a threaded. That being said, once you actually do own a good bearing press, as well as a bearing extractor that doesn't use a hammer (I have the Wheels Mfg extractor), then a lot of the opposition to PF goes away. I still prefer threaded though because I like to hear the click of a torque wrench.
#44
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T47
The current issue of VeloNews has a story about a new BB standard, T47. I’m no expert on any of this, but apparently press fit has issues with creaking noises because the frames rarely fit the BB as well as necessary to avoid noise, despite really tight tolerances. T47 is apparently a new threaded standard that combines the best of both possible worlds.
Happy riding —
Dave
Happy riding —
Dave
I searched for a thread and couldn't find one - I apologize if this has been beaten to death.
My simple question is, are pressed fit bottom brackets inferior to threaded? Would the members of this forum base a purchase decision (all things being somewhat equal) on what type of bottom bracket a bike has?
My simple question is, are pressed fit bottom brackets inferior to threaded? Would the members of this forum base a purchase decision (all things being somewhat equal) on what type of bottom bracket a bike has?
#45
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The current issue of VeloNews has a story about a new BB standard, T47. I’m no expert on any of this, but apparently press fit has issues with creaking noises because the frames rarely fit the BB as well as necessary to avoid noise, despite really tight tolerances. T47 is apparently a new threaded standard that combines the best of both possible worlds.
Happy riding —
Dave
Happy riding —
Dave
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#46
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I have pressed fit and it has not given me any problems (~22,000 km on bike). Since I like to do my own bike maintenance, I would prefer threaded as it is easier to remove but otherwise think they are equal.
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That's great when the crank is at nine o'clock. But when it's at like four o'clock, the nice gap you used to have with a three piece crank is gone with an external bearing crank.
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
#48
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I have a Trek with BB86 pressfit. Despite all the hate, I've literally never had a single issue with it and I'm probably at 45,000 miles on the original bearings. Still no play, totally smooth.
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Threaded, because, as stated above, they're idiot proof and I do my own work.
A press fit bb wouldn't be a deal breaker, because I'd get a screw together adapter.
A press fit bb wouldn't be a deal breaker, because I'd get a screw together adapter.