Anna_Sazzi

Any thoughts or experience with colnago's Threadfit 82.5?

smashndash

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

sbxx1985 

After a couple years, my 2015 BMC TMR01 is starting to creak. It was quiet until this year. The threaded BB on my 2009 Cervelo R3SL has never thought about creaking.

colnago62

I think the Madone and Emonda still use pressfit.

colnago62

there is a company that does a thread together bb for a 90 called Token and that’s how the got it to work; smaller bearings. According to the person I talked to at Enduro, that creates another set of problems to solve on the durability end. I started using BB Infinite and that has worked well for me. Cheaper solution than Token.

eflayer

interesting Trek only updated the Domane, i think, so far.

colnago62

It will be interesting to see what they do when the update both of those in a few years. I wonder if lightness will win out over durability.

Russ Roth

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.

Kimmo 

My ideal BB would be 68mm T47. Threaded, and it'll take a BB30 crank.

Remember heel clearance?

Racing Dan

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.

smashndash

yep. People criticized the crap out of DUB when they debuted their 28.99mm spindle but I think it’s the PF30/BB386 guys who’ve got it wrong. You wanna be able to use a reducer with off-the-shelf 6806 bearings.

smashndash

Wouldn’t S shaped chainstays solve the heel clearance issue? Is that not a thing?

SethAZ 

With DUB you'd have a 29mm crank and could have that in 68mm threaded.

colnago62

One of the reasons I went with SRM Origin cranks for my bikes was the ability to cheaply replace the spindle in case of damage or wear. It has already paid off. Somehow I bent the spindle which caused the chainrings to rub on the front derailleur. Sent it back to SRM, they installed a new spindle and off I go.

scott967

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.
.

Doge

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.

Bah Humbug

Before the clincher/ tubeless wars and the disc/ rim wars, this was the holy war in the 41.

rtalain

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.

d-klumpp

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

sbxx1985 

It's like a solution to the solution that wasn't a problem.

Steeler_fanatic

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.

Kimmo 

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.

Dan333SP

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.

Adonis72

threaded all day everyday

Oldguyonoldbike

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.