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Need help with my BB and crankset selection

Old 08-07-14, 06:27 PM
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banjaboy
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Need help with my BB and crankset selection

Hi guys, pulling my hair out here!!!!! I have jumped the *** and ordered a compact crankset for my bike. I presently have a standard 53/39 Force light carbon crankset. I am 63 and had a hip replacement last year and due to the surgery I have great difficulty on the monster hills where I live and its still painful to ride out of the saddle. I borrowed my friends bike, almost identical to mine except he has a compact 50/34 crankset, what a difference, like night and day. Anyway, I went online and ordered an FSA SL-K Light compact crankset form offshore, I have dealt with this guy before and he's very good. The price was unbeatable, I do buy local when I can but the difference in price couldn't be ignored.
Well here is the rub....I ordered a BB30 PF30 version. On further inspection and after my item had been shipped I did what I should have done to begin with...MEASURED!!!!!! I know, I know, anyway its done. To return the new one will cost a lot so I might just sell it and buy the right one when I know what I need. Heres the frame dimensions....The shell of the bottom bracket is about 68mm, it has a Token "cartridge type set of screw in bearings that bring the total width to about 90MM. The Token assembly as several things marked on it....Token EX-TYPE.......AL6061-009k..... BS 1.37x24T TK877EX-GY. The unit is gold coloured and screw in on each side. What the hell kind of BB do I have and what kind of crankset do I need? I dont suppose there is any kind of adaptor that will allow me to use the BB30 on this frame? I think what I need is a BB386? is that correct and what is Evo as it relates to cranks and BB's? Hope someone can help me. Obviously age doesn't always mean wisdom, yup, I feel stupid!!! Here is a pic of what I have now.
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Old 08-07-14, 07:54 PM
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e_guevara
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With the myriad of BB shells on bikes and crank options it can get very confusing. Let me clarify some things for you.

Originally Posted by banjaboy View Post
Heres the frame dimensions....The shell of the bottom bracket is about 68mm.
...
I presently have a standard 53/39 Force light carbon crankset.
...
...it has a Token cartridge type set of screw in bearings that bring the total width to about 90MM. What the hell kind of BB do I have[?]
Your bike has 68 mm wide English threaded BB shell (BSA).

The cranks are 24 mm hollow spindle cranks that use threaded outboard bearing cups (SRAM GXP).

I went online and ordered an FSA SL-K Light compact crankset. Well here is the rub....I ordered a BB30 PF30 version.
BB30/PF30 cranks have a 30 mm spindle, with the bearings pressed into the BB shell, and therefore are narrower (i.e. has a shorter spindle) than what you have right now.

... what kind of crankset do I need? I think what I need is a BB386? is that correct and what is Evo as it relates to cranks and BB's?
FSA developed the BB386 standard that combines the 30 mm BB30 spindle with the outboard bearings of BSA cranks. BB386 uses pressed-in cups in a 46 mm ID BB shell (PF30). The "EVO" version uses threaded cups for English threaded BB shells.

Yes, you will need the BB386EVO version of the crankset. You also need a MegaEvo BB for the cranks.


I dont suppose there is any kind of adaptor that will allow me to use the BB30 on this frame?
No, not for BB30 road cranks. BB386EVO cranks have longer spindles than BB30 to extend beyond the externally threaded bearing cups.

Hope this helps.

Last edited by e_guevara; 08-07-14 at 08:09 PM.
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Old 08-07-14, 08:16 PM
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Originally Posted by e_guevara View Post
With the myriad of BB shells on bikes and crank options it can get very confusing. Let me clarify some things for you.



Your bike has 68 mm wide English threaded BB shell (BSA).

The cranks are 24 mm hollow spindle cranks that use threaded outboard bearing cups (SRAM GXP).



BB30/PF30 cranks have a 30 mm spindle, with the bearings pressed into the BB shell, and therefore are narrower (i.e. has a shorter spindle) than what you have right now.



FSA developed the BB386 standard that combines the 30 mm BB30 spindle with the outboard bearings of BSA cranks.

Yes, you will need the BB386EVO version of the crankset. You also need a MegaEvo BB for the cranks.




No, not for BB30 road cranks. BB386EVO cranks have longer spindles than BB30 to extend beyond the externally threaded bearing cups.

Hope this helps.
Wow, should have come here first!! So the 24 in the bearings now means a 24 mm spindle? I thought it was threads per inch, go figure. So the bb386 will have a 30mm diameter shaft that is longer than the 24mm shaft I have now. I will require a 30mm screw in type bb assembly. The bb30 therefor is not backwards compatible with a bb386 set up. Wow, this simple swap is getting expensive. I really appreciate your wonderfully concise reply to my issue. I will get my begging hat on and see if the vendor will take the new one back.
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Old 08-07-14, 08:33 PM
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One last time, promise........ So I need a BB386 EVO, NOT the BB386? I really REALLY appreciate your help.
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Old 08-07-14, 09:11 PM
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Originally Posted by banjaboy View Post
Wow, should have come here first!! So the 24 in the bearings now means a 24 mm spindle? I thought it was threads per inch, go figure.
You are correct with 24 referring to thread pitch (24 TPI) in the BB's spec. The 1.37x24 refers to the shell diameter and threading on the cup. Older bottom brackets (cup/cone-, cartridge-types) have the same cup dimensions, but had 17 mm spindles.

So the bb386 will have a 30mm diameter shaft that is longer than the 24mm shaft I have now. I will require a 30mm screw in type bb assembly.
Yes. And yes - it's the MegaEVO BB.

The bb30 therefor is not backwards compatible with a bb386 set up.
For the road version of the crank, yes. Some "BB30 compatible" road cranks (Rotor, SRAM S-series(?) ) have longer spindles, and work similar to BB386. You can also use an MTB crank, or an MTB BB30 spindle for Cannondale Hollowgram cranks.
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Old 08-07-14, 09:17 PM
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Originally Posted by banjaboy View Post
One last time, promise........ So I need a BB386 EVO, NOT the BB386? I really REALLY appreciate your help.
The standard is named BB386, which specifies the spindle diameter and length. "EVO" is just the marketing term FSA uses for their line of cranks with the standard I believe.
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Old 08-07-14, 10:23 PM
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Perfect, I will order the correct unit. Again, thank you so much, I would have saved time and money if I came here first, lesson learned.!!!!!!
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Old 08-07-14, 10:30 PM
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Is there a difference between mega evo and just straight EVO?
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Old 08-08-14, 12:39 AM
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MegaEVO is the model of the BB for BB386EVO cranks. No such thing as "just straight EVO" in FSA's products. EVO may refer to the cranks (but that would be misleading).

There is a "MegaExo" crank/BB that uses either a 19 mm or 24 mm spindle.
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Old 08-08-14, 02:06 AM
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Be advised, if you buy a SRAM crank, you must use SRAM's bottom bracket bearing cups.

Illustrated version:

If you buy one of these:



you will have to install this in your bike's bottom bracket frame:



Edit: if you buy a SRAM crank, make sure it is the 24mm spindle GXP, not a BB30/PF30 crank.
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Old 08-08-14, 02:49 AM
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The OP is already running a SRAM Force 53/39 crankset with a Token GXP BB.
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Old 08-08-14, 08:42 AM
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I think I finally understand after you guys wonderful help. The Megexo designation is for the 24mm dia drank "shaft" the 386 EVO is a 30mm "crank "shaft" so I am going to look for a 386EVO compact crankset and the BB evo Bottom bracket. I finally found the dimension and application chart on the FSA website. So to clarify I will purchase a matching set. I might as well go with the 30mm size and get a new BB as mine is kinda old anyway. Does that make sense guys? I saw a unit that would work but the cranks are 172.5 MM instead of 170mm like my present crank arms, I hope ther is not an interference issue.
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Old 08-08-14, 08:48 AM
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OP, if it is possible, try to order an SRAM Force 50/34 GXP crankset from your seller as a replacement. That way, you won't need to replace the Token GXP BB that is currently on your bike.
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Old 08-08-14, 08:58 AM
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Originally Posted by banjaboy View Post
I think I finally understand after you guys wonderful help. The Megexo designation is for the 24mm dia drank "shaft" the 386 EVO is a 30mm "crank "shaft" so I am going to look for a 386EVO compact crankset and the BB evo Bottom bracket. I finally found the dimension and application chart on the FSA website. So to clarify I will purchase a matching set. I might as well go with the 30mm size and get a new BB as mine is kinda old anyway. Does that make sense guys? I saw a unit that would work but the cranks are 172.5 MM instead of 170mm like my present crank arms, I hope ther is not an interference issue.
Good for you.

As for the BB, they last for tens of thousands of miles before needing replacement. Anyway, yours wouldn't be compatible with any FSA crank so it would make sense to change it out.

As for the crank length, a 2.5 mm difference will not be a problem with chainstay clearance in most cases. There are some frame/crankset combos that can have interference issues but it is often with the chainrings hitting the frame and not the crank.
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Old 08-08-14, 09:11 AM
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Thanks guevara, you are so smart!!!! I emailed the person I ordered the wrong crankset from and he has a 386evo with 72.5 cranks and he will take the bb30 one back and I just pay postage so I got off the hook cheaply. Lesson learned, check first before I order anything!!!!!!!
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Old 08-08-14, 09:23 AM
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Or a triple for slogging up hills... 30t vs 34t..


I suspect the Token brand was a savings to lower the OEM built cost (& selling price)

As I read* .. Shimano hollow tech is one standard, BB 30 is another, but they are both trying to do the same thing..
tube spindle size & bearing ID.. match..

*I just have Square taper stuff, for my bikes .. (Old guy Part time, cope with the other stuff in the shop)

(online ordering is throwing the dice , and sending wrong guesses back , as you found)
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Old 08-08-14, 09:56 AM
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Originally Posted by banjaboy View Post
Thanks guevara, you are so smart!!!! I emailed the person I ordered the wrong crankset from and he has a 386evo with 72.5 cranks and he will take the bb30 one back and I just pay postage so I got off the hook cheaply. Lesson learned, check first before I order anything!!!!!!!
Don't forget the MegaEVO BB!
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Old 08-08-14, 11:21 AM
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Thanks guevara. I am getting the cranks and bottom bracket made for each other. I have contacted the vendor and the FSA tech support and I know what I need and you weredead right in your explanation to me.
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