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What bottom bracket size /model do I need?

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What bottom bracket size /model do I need?

Old 06-14-19, 04:21 PM
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Law281
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What bottom bracket size /model do I need?

Hello people, so I'm working on a bike build and got a frame recently second hand but when I measure in the inside tube, it doesn't add up, so bit confused.

Frame is Giant defy advanced 1(2014) Medium. From online specs it says Shimano press fit, but no sizing. I'm also using Shimano 105 cranks, if that helps.

Appreciate the help!
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Old 06-14-19, 05:11 PM
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Shimano 105 cranks covers about 20 years and numerous generations and BB types. You'll need to be a bit more specific.
Everything from this.
http://velobase.com/ViewComponent.as...34a99&Enum=115

To this
https://bike.shimano.com/en-EU/compo.../crankset.html


https://bike.shimano.com/en-EU/produ...M-BB72-41.html
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Old 06-15-19, 03:36 AM
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Crank model

Hey, the 105 is 52-36mb, FC-5800 172.5, if that helps, thanks for the help
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Old 06-15-19, 05:24 AM
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https://si.shimano.com/pdfs/dm/DM-FC0003-06-ENG.pdf

https://productinfo.shimano.com/#/co...453&acid=C-455

Last edited by dedhed; 06-15-19 at 05:27 AM.
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Old 06-15-19, 06:58 AM
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Moving to Mechanics Forum
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Old 06-15-19, 07:47 AM
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The FC-5800 is a Hollowtech II design with the spindle built into the driveside crank arm so the spindle length is fixed. The matching bottom bracket has external cups and you need the press-fit version which is SM-BB72-41.
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