Bottom Bracket

Ballmead
Posts: 166
Joined: Sat Mar 15, 2014 9:16 pm

Bottom Bracket

Postby Ballmead » Thu Jan 04, 2024 6:49 am

I'm changing the crankset on my bike from 1x GRX to 105.
The current Ultegra BB has around 1500klms on it and seems to be in good condition.
Do I need to change it after 1500klms or am I good to go?
How many klms do they usually last?

2wheels_mond
Posts: 424
Joined: Tue May 14, 2013 6:17 pm
Location: Hobart, Tasmania

Re: Bottom Bracket

Postby 2wheels_mond » Thu Jan 04, 2024 7:31 am

Ballmead wrote:
Thu Jan 04, 2024 6:49 am
I'm changing the crankset on my bike from 1x GRX to 105.
The current Ultegra BB has around 1500klms on it and seems to be in good condition.
Do I need to change it after 1500klms or am I good to go?
How many klms do they usually last?
Much, much longer than that - just leave it in. No point changing it out unless it's causing any noise.

Mr Purple
Posts: 2876
Joined: Sat Sep 12, 2020 1:14 pm

Re: Bottom Bracket

Postby Mr Purple » Thu Jan 04, 2024 1:15 pm

I kill things. Tyres, derailleurs, framesets, shifter cables, chains and cassettes. Kill them very well and very quickly.

My current Ultegra bottom bracket has 20,000km on it without an issue. I'll replace it when I upgrade the crankset but that's just because they're cheap and I'll be there.

I wouldn't worry.

User avatar
g-boaf
Posts: 21431
Joined: Mon Sep 26, 2011 6:11 pm

Re: Bottom Bracket

Postby g-boaf » Thu Jan 04, 2024 9:11 pm

Ballmead wrote:
Thu Jan 04, 2024 6:49 am
I'm changing the crankset on my bike from 1x GRX to 105.
The current Ultegra BB has around 1500klms on it and seems to be in good condition.
Do I need to change it after 1500klms or am I good to go?
How many klms do they usually last?
Only change it if it's noisy or doesn't feel smooth.

They go for ages usually. I used to have the press fit Dura Ace bottom brackets in my Canyon and they were quite trouble free. I then went over to Kogel ceramic bottom brackets and those are decent as well.

The S5 has whatever SRAM bottom bracket it came with from new and it's still going fine at some 15,000km.

Ballmead
Posts: 166
Joined: Sat Mar 15, 2014 9:16 pm

Re: Bottom Bracket

Postby Ballmead » Fri Jan 05, 2024 6:36 am

Thank you all. Looks like I'm good to go with the crank replacement.

Ballmead
Posts: 166
Joined: Sat Mar 15, 2014 9:16 pm

Re: Bottom Bracket

Postby Ballmead » Fri Jan 05, 2024 10:08 am

Thank you all. Looks like I'm good to go with the crank replacement and existing BB.

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