30mm bearings in bb86 frame

Discuss light weight issues concerning road bikes & parts.
Jacksoneaker
Posts: 11
Joined: Mon Jul 02, 2018 4:09 am

by Jacksoneaker

I realize that there are lots of threads on this topic, but is there a general consensus of the best pf4130 bearing set? Trying to put a quarq 30mm spindle into a bb86 frame. Options I’ve seen that aren’t crazy expensive are the Rotor 4130 and FSA bb386 in bb86 bottom brackets. Am I missing the one to get?

by Weenie


cro2
Posts: 35
Joined: Fri Oct 13, 2017 7:39 am

by cro2

I haven't tried Rotors but I've used FSA 386 and they were very reliable, no problems whatsoever. They also rolled very smoothly until I logged some serious miles of winter training.

TiCass
Posts: 124
Joined: Thu Aug 04, 2016 1:13 pm

by TiCass

I've done it with Rotor 4130. So far so good. But it's still a stupid bb standard.

bilwit
Posts: 967
Joined: Sun Apr 03, 2016 5:49 am
Location: Seattle, WA

by bilwit

Do some research on the Rotor 4130 first before you go with it. I've recently put one in my BB86 bike (going from DA9000 crank to Rotor 3D+) and had creak problems (yes the cups were interfaced with the frame with loctite) at certain power outputs (especially on the trainer). I think the lack of sleeve between the two cups is a big problem when there isn't much margin for error in this setup. The BB Infinite one looks like the best solution (it's a one-piece design) but it looks like a pain in the ass if you have to take it out which is a concern for Di2 users. I went with C-Bear which is a decent chunk of change (~$170) but not an absurd amount like some of these other ones like Kogel. For this specific spindle+BB shell setup, you shouldn't cheap out on the BB..

emcardle
Posts: 82
Joined: Mon Mar 30, 2015 5:39 pm

by emcardle

Also used/use a rotor 4130 steel bottom bracket. Longevity is worse than most and it seems that there is more friction than others.

fizzaz
Posts: 4
Joined: Wed Nov 07, 2018 5:02 pm

by fizzaz

I had nothing but trouble from the FSA adapter. Right now I am trying out the Wheels MFG flanged bearings and it seems much better.

Andres
Posts: 50
Joined: Mon Mar 09, 2009 10:10 am

by Andres

What frame is this going on? I find usually the frame has more to do with how well things feel than the bearings themselves. Wheels manufacturing has a good steel alternative, Kogel and Ceramicspeed for Ceramic though I've had a ceramicspeed on a Scott Plasma that felt like garbage, mostly due to the BB shell being undersized (out of round) - I've also had steel bearings on a BMC that felt very smooth.

lewolive
Posts: 109
Joined: Tue Dec 04, 2012 4:10 pm
Location: Gien, France
Contact:

by lewolive

I'm using CyrclingCeramic 41/30. My frame is Canyon Ultimate CF SLX and the crank is Rotor 2Inpower.
I've been using the first generation of Ceramic bearings from CylingCeramic for 3 years. I have replaced the BB this summer by the new on range of balls 41/30. The BB is very thin (there is not much room for bearings). However, I've got the best smootness ever seen on a BB86 BB. Without a chain in place, my crank is making 20-25 laps after launch.
I need to have a long terme review on this, but it looks still new after many rainy rides. Smoothness remains perfect and there is no noise.
I think that BB86 can be now used with 30mm cranks, but you must spend $200 for quality. It makes sense when you have a dual powermeter and if you expect to using this quality product for 3 years. Limited budgets should stay on Shimano cranks and steel BB86 24mm bearings.

ironman1
Posts: 191
Joined: Thu Dec 09, 2004 5:51 pm

by ironman1

Does Kogel still use just 1 row of bearings in their 4130 BB ?

Andres
Posts: 50
Joined: Mon Mar 09, 2009 10:10 am

by Andres

ironman1 wrote:
Fri Nov 09, 2018 7:00 pm
Does Kogel still use just 1 row of bearings in their 4130 BB ?
The one I've got, yes... doesn't look like they've changed it from the picture. I was wrong in my other post, the Enduro is the steel version I would recommend because they have the additional bearings you're asking about (not Wheels Mfg.)

hambini
Posts: 356
Joined: Tue Nov 15, 2016 8:13 am

by hambini

Even if your bottom bracket doesn't creak. You will get significantly reduced bearing life and stiffness. The load rating for a 4130 bottom bracket is ~25% of that of a bottom bracket that uses 6806 bearings (BB30/PF30/BB386)

If you have the option, I would consider a different crankset. Shimano deliberately designed BB86 to stop people using 30mm cranksets

Hambini

TheKaiser
Posts: 541
Joined: Thu Sep 05, 2013 3:29 pm

by TheKaiser

hambini wrote:
Fri Nov 09, 2018 10:22 pm
The load rating for a 4130 bottom bracket is ~25% of that of a bottom bracket that uses 6806 bearings (BB30/PF30/BB386)


Hambini
Good to see you back! Always appreciated your sharing of tech data like your 25% figure above.

TiCass
Posts: 124
Joined: Thu Aug 04, 2016 1:13 pm

by TiCass

hambini wrote:
Fri Nov 09, 2018 10:22 pm
Even if your bottom bracket doesn't creak. You will get significantly reduced bearing life and stiffness. The load rating for a 4130 bottom bracket is ~25% of that of a bottom bracket that uses 6806 bearings (BB30/PF30/BB386)

If you have the option, I would consider a different crankset. Shimano deliberately designed BB86 to stop people using 30mm cranksets

Hambini
Hi Hambini, I'm in a similar situation as the OP, I got a power meter in a 30mm simple crank and a bb86. Do you have any advice for the "less worst" solution?

Thx

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wheelsONfire
Posts: 2063
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

The whole thing with framesets BB standard designed around anything than 30mm bearings is so stupid.
I can't understand this! Even so, it's so usual today that it makes me wonder how this could be?
I dismiss all and every frameset built like this.
Bikes:

Ax Lightness Vial EVO D
Paduano Racing Fidia
Open *UP*
https://opencycle.com/showcase/the-xplo ... eelsonfire

hambini
Posts: 356
Joined: Tue Nov 15, 2016 8:13 am

by hambini

TiCass wrote:
Fri Nov 09, 2018 11:42 pm
hambini wrote:
Fri Nov 09, 2018 10:22 pm
Even if your bottom bracket doesn't creak. You will get significantly reduced bearing life and stiffness. The load rating for a 4130 bottom bracket is ~25% of that of a bottom bracket that uses 6806 bearings (BB30/PF30/BB386)

If you have the option, I would consider a different crankset. Shimano deliberately designed BB86 to stop people using 30mm cranksets

Hambini
Hi Hambini, I'm in a similar situation as the OP, I got a power meter in a 30mm simple crank and a bb86. Do you have any advice for the "less worst" solution?

Thx
Best advice would be to go to a smaller diameter crankset.

If you can't do that, the other options on the table are a ground down 6806 or a 6706. Both have problems, the grinding down causes the sidewalls to be very thin so the bearing flexes under load. A 6706 is very thin to start off with - only 4mm.

I've made a couple of bottom brackets for people in the past where I doubled up a 6706, so you end up with 4x6706 bearings in the bottom bracket. It is technically a PITA but they didn't creak. I got SKF to make the bearings to a higher specification than the "off the shelf" ones, so the reduction in life and power ended up at around 15%.

The above solution was okay as the two bikes were that of a world tour rider and he had the budget and spares but it is not feasible for a club rider because it causes a spare parts problem when the bearings inevitably wear out.

Hope that Helps
Hambini

by Weenie


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