Push fit BB

[Jimmy Welch]

Hi my mate wants to upgrade his FSA 50/34 chainring to Shimano 105 52/36 he currently had a push fit bb 2 questions will this new chainring fit with the existing bb and is it OK to go up a couple of teeth in chain size without too much adjustment

 

[Ajax Bay]

Yes to the second Q. May need to nudge the FD up a few mm (so check if FD braze-on).
Be more specific about the FSA chainset.
https://shop.fullspeedahead.com/en/type/cranksets?discipline=378&series=

 

[Jimmy Welch]

Yes to the second Q. May need to nudge the FD up a few mm (so check if FD braze-on).
Be more specific about the FSA chainset.
https://shop.fullspeedahead.com/en/type/cranksets?discipline=378&series=

Hi mate the fsa chainring is an 50/34 172mm cranks it came on the bike from Cube the rest of the groupset is 105

 

[Jimmy Welch]

Yes to the second Q. May need to nudge the FD up a few mm (so check if FD braze-on).
Be more specific about the FSA chainset.
https://shop.fullspeedahead.com/en/type/cranksets?discipline=378&series=

FSA Gossamar

 

[Jimmy Welch]

Hi mate the fsa chainring is an 50/34 172mm cranks it came on the bike from Cube the rest of the groupset is 105

Yes to the second Q. May need to nudge the FD up a few mm (so check if FD braze-on).
Be more specific about the FSA chainset.
https://shop.fullspeedahead.com/en/type/cranksets?discipline=378&series=

 

[Cycleops]

"will this new chainring fit with the existing bb".
I think you mean will the Shimano ring fit the spider on the FSA crank? The BB doesn't come into it. Don't know how you'd find out, a visual check might not suffice. Perhaps someone on here who has done this might know.

 

[Jimmy Welch]

"will this new chainring fit with the existing bb".
I think you mean will the Shimano ring fit the spider on the FSA crank? The BB doesn't come into it. Don't know how you'd find out, a visual check might not suffice. Perhaps someone on here who has done this might know.

Hi sorry no I want to fit a whole new Shimano 105 11 50/34 or 52/36 chainring on my mates bike without a load of faff on the the bb

 

[Jimmy Welch]

Hi sorry no I want to fit a whole new Shimano 105 11 50/34 or 52/36 chainring on my mates bike without a load of faff on the the bb

"will this new chainring fit with the existing bb".
I think you mean will the Shimano ring fit the spider on the FSA crank? The BB doesn't come into it. Don't know how you'd find out, a visual check might not suffice. Perhaps someone on here who has done this might know.

I recently fitted a 105 on to my bike but this had a threaded bb housing and the hollowtech went straight in this is a push fit only frame

 

[Cycleops]

Oh sorry. I think you'll need to use the Shimano press-fit BB as I can't imagine Shimano spindle would be exactly the same dimensions as FSA. Unless someone knows different.

 

[Jimmy Welch]

Ah right starting to make sense now

 

[Cycleops]

The answer would appear to be no, well it doesn't work the other way around anyway.


View: https://youtu.be/E6HNC8HMgH4?si=h3L04KKvMcCQeO


Looks like you'll have to use the Shimano BB.

 

[Ajax Bay]

• BB Interface: BB386EVO
• Axle: 30mm

The Shimano chainset you wish to fit has a 24mm spindle.
And you're looking for a 'press fit' BB.

 

[Jimmy Welch]

Brilliant mate I'll get LBS to fit the shimano bb and we should be good to go thanks very much for all your help