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Discussion Starter · #1 ·
Hi, I'm currently looking to upgrade to and FSA dual crankset, which doesn't come with a bottom bracket. I am not sure if the bottom bracket I already have will work, or if I have to purchase a new one. Attached is an image of the crankset I am looking to purchase, with its details, and my current bottom bracket with its details.

This is what my current bottom bracket says on it
"VP"
VP-BC73
73
BC 1.37x24T
125.5mm
L <-> P

here is a link to the crankset
https://www.wiggle.com.au/fsa-v-drive-modular-2x-boost-chainset-wo-bb/
 

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That's a square taper BB, meaning the little nubs sticking out each side are the "axle" the crank arms connect to.
The crankset you're picking has a 24mm spindle(axle), so need an open BB with a 24mm opening and 73mm shell width.
I'd go with a hollowtech II BB. They're inexpensive and work very well.

https://www.jensonusa.com/Shimano-Saint-Bottom-Bracket

This one will work just fine with the crankset you're looking at. Just make sure to install the proper number of spacers during install, as this will do 68 or 73 shell sizes.

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Hi, I've found this one on eBay with quick shipping to Australia, just wondering if it would be compatible as I can't seem to find much details about it on the AD? Thankyou so much for your previous response btw

https://www.ebay.com.au/itm/Shimano...040397&hash=item43d25789ab:g:0lgAAOSwVK9bIiqh
Very similar. The Saint one may last a little longer, as it's their burlier "downhill" variant, but the deore should work just as well.

In the end, both are compatible

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Discussion Starter · #8 ·

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Not entirely sure, I think it's 145mm wide though,
Here is the bike not sure it really says anything about hub dimensions thouh,
https://www.trekbikes.com/au/en_AU/...untry-mountain-bikes/marlin/marlin-5/p/23134/

It isn't a boost setup
I have that bike actually. Well, my daughter owns it now.
135 QR (quick release) rear.
Can't use Boost crank with it, as it'll cause unnecessarily fast chain, chainring, and cassette wear...not to mention noise...
Look for a non-boost variant.

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