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FSA megaexo BB - what thread do they use?

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FSA megaexo BB - what thread do they use?

Old 07-09-22, 03:22 AM
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alexk_il
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FSA megaexo BB - what thread do they use?

Need to change FSA Megaexo BB (I think that's what I have) to square tapered JIS.

Do I simply remove old BB and install the new one or is it more complicated? I know square JIS use English thread but can't find info about the FSA, do they use the shame?
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Old 07-09-22, 06:14 AM
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BB threads are based on what the frame is threaded for. Bottom bracket shells have been threaded in English (BSA), French, Italian, and Swiss threads over the years.
Most threaded BB built since say the mid 90's are English threaded (1.37" X 24) with a smattering of Italian.

The spindle length of your new BB will be determined by whatever new crankset you are installing on it.
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Old 07-09-22, 09:15 AM
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Originally Posted by alexk_il View Post
Need to change FSA Megaexo BB (I think that's what I have) to square tapered JIS.

Do I simply remove old BB and install the new one or is it more complicated? I know square JIS use English thread but can't find info about the FSA, do they use the shame?
As dedhed posted it has nothing to do w/ the brand of bottom bracket, it has everything to do w/ the frame and how it is threaded.
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Old 07-09-22, 09:37 AM
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I think the FSA MegaEXO is for two piece cranksets with a 24mm spindle. No JIS or any square taper involved. If you are in the market for a new crank and BB, then in most cases I'd recommend you get a 2 piece crank.

What crank do you have or what crank are you intending to put on it. Get the part number off the backside of the crankarm if there is one.

Last edited by Iride01; 07-09-22 at 09:41 AM.
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Old 07-09-22, 09:40 AM
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Originally Posted by alexk_il View Post
Need to change FSA Megaexo BB (I think that's what I have) to square tapered JIS.

Do I simply remove old BB and install the new one or is it more complicated? I know square JIS use English thread but can't find info about the FSA, do they use the shame?
I had a nice FSA mega expo on my Wilier from 2013. I finally decide to upgrade got a Shimano r7000 but still have the 10 speed Ultegra 6700 groupset. These cranks are way better and spin much better. You have a BSA threaded BB so get an R7000 11 spd crank and a Shimano BBR60 Bottom Braket for that crank. The crank will run 10 spd components and it will spin much better. It probably will cost you about $210 to do this but well worth the money and easy to swap out.
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Old 07-09-22, 10:21 AM
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Originally Posted by Iride01 View Post
I think the FSA MegaEXO is for two piece cranksets with a 24mm spindle.
MegaExo is also available with a 19mm spindle bore, but I assume that the OP is replacing the whole crank/BB with a square taper.
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Old 07-09-22, 02:19 PM
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Originally Posted by alexk_il View Post
Need to change FSA Megaexo BB (I think that's what I have) to square tapered JIS.

Do I simply remove old BB and install the new one or is it more complicated? I know square JIS use English thread but can't find info about the FSA, do they use the shame?
JIS bottom brackets do not necessarily have to use English threading. In all likelihood your frame is English threaded, but there is no way for us to know that without details about your actual frame and perhaps why you have to change the bottom bracket which will also require a new crank
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Old 07-09-22, 04:34 PM
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Originally Posted by deacon mark View Post
I had a nice FSA mega expo on my Wilier from 2013. I finally decide to upgrade got a Shimano r7000 but still have the 10 speed Ultegra 6700 groupset. These cranks are way better and spin much better. You have a BSA threaded BB so get an R7000 11 spd crank and a Shimano BBR60 Bottom Braket for that crank. The crank will run 10 spd components and it will spin much better. It probably will cost you about $210 to do this but well worth the money and easy to swap out.
Changing the stock components to Sugino JIS cranks on the front and M8000 cassette, derailleur and shifters on the back. Probably costs more than $210 all together.
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Old 07-09-22, 04:39 PM
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Originally Posted by alcjphil View Post
JIS bottom brackets do not necessarily have to use English threading. In all likelihood your frame is English threaded, but there is no way for us to know that without details about your actual frame and perhaps why you have to change the bottom bracket which will also require a new crank
Boardman Hybrid bike, roughly 2011-2014 in relatively mint condition. The frame has different BBs depending on the year, some were built with BB30, some with PF30 and some with FSA megaexo. Will use Sugino 42/26 JIS instead of the original FSA compact 50/34.
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Old 07-09-22, 04:40 PM
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Originally Posted by alcjphil View Post
JIS bottom brackets do not necessarily have to use English threading. In all likelihood your frame is English threaded, but there is no way for us to know that without details about your actual frame and perhaps why you have to change the bottom bracket which will also require a new crank
Boardman Hybrid bike, roughly 2011-2014 in relatively mint condition. The frame has different BBs depending on the year, some were built with BB30, some with PF30 and some with FSA megaexo.

Will use Sugino 42/26 JIS instead of the original FSA compact 50/34. If my bike has English thread, then will use Tange 3922 BB.


​​​

Last edited by alexk_il; 07-09-22 at 04:50 PM.
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Old 07-10-22, 09:22 AM
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Originally Posted by alexk_il View Post
Boardman Hybrid bike, roughly 2011-2014 in relatively mint condition. The frame has different BBs depending on the year, some were built with BB30, some with PF30 and some with FSA megaexo.

Will use Sugino 42/26 JIS instead of the original FSA compact 50/34. If my bike has English thread, then will use Tange 3922 BB.


​​​
Might want to hold off ordering anything else until you determine what type of BB shell you have. FSA's website says that their MegaExo bottom brackets were made in English thread (various lengths), Italian thread, and "several press-fit bottom bracket standards" versions. If I recall correctly, BB30 and PF30 are two different press-fit bottom bracket standards.

https://www.fullspeedahead.com/en/technology

I'd recommend determining with certainty which BB shell you have before proceeding further.

Last edited by Hondo6; 07-10-22 at 09:30 AM.
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Old 07-10-22, 09:31 AM
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If you take the bike by a bike shop when it's slow, you can probably engage the mechanic in a lengthy conversation about your bike and cycling and get all kinds of information about what you might have on your bike. Mechanics and shops owner's at LBS around me will talk your head off once you get them going. And all for FREE!
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Old 07-16-22, 04:33 PM
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And the answer is...

Originally Posted by alexk_il View Post
Need to change FSA Megaexo BB (I think that's what I have) to square tapered JIS.

Do I simply remove old BB and install the new one or is it more complicated? I know square JIS use English thread but can't find info about the FSA, do they use the shame?
FSA Mega Exo uses English thread. Removing the FSA and replacing it with square tapered BB was a straightforward task on my bike.
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Old 07-16-22, 05:38 PM
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Originally Posted by alexk_il;[url=tel:22576846
22576846[/url]]FSA Mega Exo uses English thread. Removing the FSA and replacing it with square tapered BB was a straightforward task on my bike.
MegaExo BBS also come in Italian threading. While itís unlikely that thatís what the OP has, itís worth confirming.
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Old 07-16-22, 05:49 PM
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alexk_il
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Originally Posted by Rolla View Post
MegaExo BBS also come in Italian threading. While itís unlikely that thatís what the OP has, itís worth confirming.
I am the OP, so I can confirm that the bike in question came with English thread. Not surprising for a bike designed and built in the UK.
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