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Confused about bottom brackets/cranks

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Confused about bottom brackets/cranks

Old 12-27-14, 12:38 PM
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Confused about bottom brackets/cranks

My bike (link below) came with a pig heavy crankset that stands to save nearly a pound by getting a lighter one.

The frame description of my bike says BB30 but the tech specs say BB386. The next model up says BB30 in both places. I thought most frames within the same model family were the same dimensions, just different materials.

There are a ton of BB30 crank options but hardly any BB386 options. I might just stick with what I have but if I decide to upgrade, what are my choices?


F65x - Felt Bicycles
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Old 12-27-14, 02:12 PM
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Some info

Complete guide to bottom brackets - BikeRadar

FSA BB386 EVO Road Cranksets Introduction - FSA Road - FSA
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Old 12-27-14, 02:46 PM
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Looks like your frame is threaded FSA Bottom Brackets - FSA external bearing...

If so just pony up the 'cost no object' price of something with Carbon fiber and such , a complete replacement ...
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Old 12-27-14, 05:21 PM
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Originally Posted by fietsbob
Looks like your frame is threaded FSA Bottom Brackets - FSA external bearing...

If so just pony up the 'cost no object' price of something with Carbon fiber and such , a complete replacement ...
Aren't BB30 cranks like 68mm wide and BB386 are 86.5mm wide?
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Old 12-27-14, 05:22 PM
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From the website you linked "Accepts standard PF30 bottom bracket cups but the wider shell requires a 386 EVO-compatible crankset"

There do not appear to be very many of those cranks... Gossamer (what I have) and the FSA SL-K Light ($600ish).


I'm equally confused how the next frame up, which I would assume is the same exact dimensions as my frame but just made from carbon, can accept a narrower crank than my frame.

Last edited by Alias530; 12-27-14 at 05:33 PM.
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Old 12-28-14, 10:21 AM
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Aren't BB30 cranks like 68mm wide and BB386 are 86.5mm wide?
Your Bike .. Measure and report your findings ..
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Old 12-28-14, 10:40 AM
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Originally Posted by fietsbob
Your Bike .. Measure and report your findings ..
Hard to get in there with the crank on for an exact measurement with calipers but it's about 86mm

So how/why is the carbon frame using a BB30?
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Old 12-28-14, 10:54 AM
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IDK why, I'm not the engineer.

I see a Trend to make the BB axle an ever larger Tube , which started when a Small So California Maker hand Welded a Steel Hollow box arm crank
and welded
a Tubular spindle on the Right Arm.. ... Roger Durham,'Bullseye' .... His patent Lapsed ..

As the spindle gets bigger , the bearings get smaller , so moved outboard , or the BB shell size had to go Larger..

stiffer lighter, is a motivation..
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Old 12-28-14, 11:30 AM
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Originally Posted by jimc101
Good article. Thanks.
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Old 12-29-14, 02:08 PM
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FSA BB30 vs BB386EVO ? A Visual Comparison & Weights

here's another article for you. it seems you can use some shimano and campy cranks too with the right adapters (down at the bottom of the article). good luck with this.
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Old 12-29-14, 10:11 PM
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Originally Posted by Alias530
Hard to get in there with the crank on for an exact measurement with calipers but it's about 86mm

So how/why is the carbon frame using a BB30?
Because last years models all were BB30 and it is last year's design?

F65X - Felt Bicycles
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Old 12-30-14, 12:17 PM
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Originally Posted by GeneO
Because last years models all were BB30 and it is last year's design?

F65X - Felt Bicycles
Oh I see. The next model up from the one I have still has external cable routing so I wonder if they didn't make any changes for 2015 except to my model.
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Old 12-30-14, 02:37 PM
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Looks like I can use SRAM GXP stuff with an adapter.
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Old 01-01-15, 06:42 PM
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Originally Posted by Alias530
Looks like I can use SRAM GXP stuff with an adapter.
Can anyone confirm this?

I was eyeing the CX1 crankset but the GXP one (if it'll even work) is like 30% heavier than the BB30 one, which one fit my frame. Probably won't upgrade
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Old 01-02-15, 08:40 AM
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Originally Posted by Alias530
Can anyone confirm this?

I was eyeing the CX1 crankset but the GXP one (if it'll even work) is like 30% heavier than the BB30 one, which one fit my frame. Probably won't upgrade
Looks like you can as well:
FSA BB386EVO SR Adapter - FSA

If you want to be sure, buy the $20 adapter, remove your crankset, and test-fit it. If it dosen't fit, return it. If it does, order the GXP crankset.

BTW - this may be a topic for elsewhere, but IMO the seals on convential english bottom brackets (like GXP's) are MUCH better than on BB30's, and the bearings are less prone to contamination by water and debris. For bike that you intend to get muddy (like a cross bike), they are a better choice, and worth the slightly heavier weight and less stiffness.
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Old 01-02-15, 09:56 AM
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Originally Posted by DirtRoadRunner
Looks like you can as well:
FSA BB386EVO SR Adapter - FSA

If you want to be sure, buy the $20 adapter, remove your crankset, and test-fit it. If it dosen't fit, return it. If it does, order the GXP crankset.

BTW - this may be a topic for elsewhere, but IMO the seals on convential english bottom brackets (like GXP's) are MUCH better than on BB30's, and the bearings are less prone to contamination by water and debris. For bike that you intend to get muddy (like a cross bike), they are a better choice, and worth the slightly heavier weight and less stiffness.
Isn't the BB386 basically a BB30 with a wider shell? Wouldn't I still basically be on a BB30, just with reducers (the adapter) if I did that?
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Old 01-02-15, 11:49 AM
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Originally Posted by Alias530
Can anyone confirm this?

I was eyeing the CX1 crankset but the GXP one (if it'll even work) is like 30% heavier than the BB30 one, which one fit my frame. Probably won't upgrade

If you're thinking about going 1x, why not just keep the existing crank/bottom bracket set up and swap out the double rings for the appropriate single ring? You'd end up cutting a ton of weight by getting rid of all the front shifting parts you aren't going to use and it would simplify the whole process a bit. just a thought...
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Old 01-02-15, 12:36 PM
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Originally Posted by justin1138
If you're thinking about going 1x, why not just keep the existing crank/bottom bracket set up and swap out the double rings for the appropriate single ring? You'd end up cutting a ton of weight by getting rid of all the front shifting parts you aren't going to use and it would simplify the whole process a bit. just a thought...
I was planning on doing that also. The biggest weight advantage seems to be ditching this pig heavy Gossamer for a CX1. Almost 300g to lose just in the crank. Then another 150-200 in rings/derailleur. But if the GXP version of the crank I'm looking at is only 100g lighter than what I have, I'll definitely keep what I have. The merchant I'm looking at insists that the GXP version weighs the same as the BB30 version, but they are the ONLY merchant to claim this. I guess I can return it if they're wrong.
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