BSA 68 support for 30[mm] crank axle

Discuss light weight issues concerning road bikes & parts.
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Shmitt
Posts: 55
Joined: Tue Mar 22, 2016 1:52 pm

by Shmitt

Bike has standard BSA68 support, and I want to ask about proper support for cranks with 30[mm] axle like Rotor 3D+ and FSA K-Force Light BB386EVO.

I want to buy supports from c-bear:

https://www.c-bear.com/en/products/bott ... a-bsa-only

https://www.c-bear.com/en/products/bsa-rotor-30mm

What can You tell about them? Generally is worth going for 30[mm] crank for BSA68? Or should go for smaller axle?
What can You tell about bearings durability? Should I looking for any problems with those kind of support and cranks?

mr4fox
Posts: 253
Joined: Sat May 15, 2010 2:01 pm

by mr4fox

If i understand the question correctly you want to know about using a bb30 crankset (with 30mm axle) on a frame designed for bsa68(English 68mm designed for a 24mm axle) right?

The bottom bracket (the hole) in the frame with the bsa68 is a smaller diameter than the hole in a frame that uses bb30. You can find bottom brackets that will fit a bsa68 frame and let you use the larger axle diameter of the bb30 cranks but this means the bearing have to be smaller (thinner) to allow for both the smaller hole in the frame and the larger crank axle.

I emailed Enduro (bearings) about this a few years ago and they said that, while they do sell the necessary bottom brackets to make it work, If is once I was buying a new crank I would be better off just buying the 24mm version and using a normal English threaded bottom bracket as the bearing would be larger and would last longer.

So I've never actually tried it myself. Makes sense that the smaller bearing would wear considerably faster. Hopefully others with first hand experience can offer more advice.


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by Weenie


Attermann
Posts: 221
Joined: Sun Jan 05, 2014 11:04 pm
Location: Denmark

by Attermann

I use a praxis chainset, on a bb86 frame that I use for foul wheather, and that works just perfect, it has lasted pretty long and has seen a lot of rain.

Shmitt
Posts: 55
Joined: Tue Mar 22, 2016 1:52 pm

by Shmitt

I know that in the cups bearings has larger inner diameter , and in all are thinnner that standard for 24mm axle, or sram gxp.
what i wanted to know, do I need anticipated more problems with this kind of bearings, support, than standard 24mm.

Yes crankset with 30[mm] axle for BSA68 english threaded

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bikerjulio
Posts: 1901
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Location: Welland, Ontario

by bikerjulio

since the bearings are external to the frame there is no need for them to be smaller than say a shimano hollowtech. in fact they are simply a larger version. why should there be a problem? The bearings can be as big as necessary.

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So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

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AZR3
Posts: 646
Joined: Wed Sep 12, 2012 9:00 pm
Location: Az USA

by AZR3

I have an older 2011 Cervelo S3 which is BSA, before they moved to BBRight bottom bracket, and I currently have a wheels mfg BSA30 bottom bracket with a Rotor 3D+ crank installed with over 10k miles on the set up without issue.
There are a few different manufactures of BSA30 bottom brackets, some of the bearing cups are slightly thinner but they typically came with thin spacers to adjust any lateral play.

Shmitt
Posts: 55
Joined: Tue Mar 22, 2016 1:52 pm

by Shmitt

Okay, so do not need worry , and can take cranksets with 30[mm] axle..

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jekyll man
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Location: Pack filler

by jekyll man

Basically you'll need a "long length" version ie like the 3D+ or 386 evo.
A true BB30 will not be long enough.
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Shmitt
Posts: 55
Joined: Tue Mar 22, 2016 1:52 pm

by Shmitt

Basically you'll need a "long length" version ie like the 3D+ or 386 evo.
A true BB30 will not be long enough.


and I wrote:

Bike has standard BSA68 support, and I want to ask about proper support for cranks with 30[mm] axle like Rotor 3D+ and FSA K-Force Light BB386EVO.

Flapmeat
Posts: 44
Joined: Sun Mar 22, 2015 1:52 pm

by Flapmeat

jekyll man wrote:Basically you'll need a "long length" version ie like the 3D+ or 386 evo.
A true BB30 will not be long enough.


Correct. Quarq cranksets will also work (aside from Red) as they all have long BB30 spindles. If there's a threaded, removable adjuster on the cranksets, it will work with BSA30 cups

by Weenie


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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

If there's a threaded, removable adjuster on the cranksets, it will work with BSA30 cups


No. Those spindles are BB30 lengthened by about 5mm for the adjustable spacer.

BB386 evo spindles are substantially longer.
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM

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