Author Topic: Bottom bracket/crank spindle (Read 1283 times)

bazcarnegs · « **on:** June 24, 2018, 11:11 PM »

Hey, fairly new to the whole maintenance side of things. I’ve been out practising stuff on my bmx and had a little try if my friends, his pedalling was so much smoother and “grind free” so I’m looking into replacing some parts. I’m not sure exactly what I would need to replace, is it common to replace bottom bracket and crank spindle at the same time or is one more prone to wear than the other? I’m not 100% on what both do truth be told. Just putting out the feelers to see what’s what at the moment. Any help or advice greatly appreciated. Thanks in advance.

Sent from my iPhone using Tapatalk

chrisv39 · « **Reply #1 on:** June 25, 2018, 12:02 AM »

What set up do you have, One piece cranks or three piece cranks?

bazcarnegs · « **Reply #2 on:** June 25, 2018, 09:11 AM »

Quote from: chrisv39 on June 25, 2018, 12:02 AM

What set up do you have, One piece cranks or three piece cranks?

How do I tell the difference? Sorry noob here

It’s a fitbike if that makes any difference?

Sent from my iPhone using Tapatalk

bazcarnegs · « **Reply #3 on:** June 25, 2018, 09:11 AM »

Quote from: chrisv39 on June 25, 2018, 12:02 AM

What set up do you have, One piece cranks or three piece cranks?

How do I tell the difference? Sorry noob here

It’s a fitbike if that makes any difference?

Sent from my iPhone using Tapatalk

bazcarnegs · « **Reply #4 on:** June 25, 2018, 09:11 AM »

Quote from: chrisv39 on June 25, 2018, 12:02 AM

What set up do you have, One piece cranks or three piece cranks?

How do I tell the difference? Sorry noob here

It’s a fitbike if that makes any difference?

Sent from my iPhone using Tapatalk

bazcarnegs · « **Reply #5 on:** June 25, 2018, 09:14 AM »

Sorry phone went into a flap there...

Sent from my iPhone using Tapatalk

griff · « **Reply #6 on:** June 25, 2018, 04:53 PM »

If it's new school almost certainly 3-piece (the crank arms are separate and bolt onto a spindle)

Moving this thread to tech/resto as you may get a better response in there

Crunching could be a sign that your bearings are on the way out or there's some shite in there - if they're not a sealed unit stuff can get in
New BB wouldn't cost much for a new school setup - recommend getting a sealed one if regreasing your current one is no good

bazcarnegs · « **Reply #7 on:** June 26, 2018, 07:14 AM »

Ah cool thanks. Yeah I think it’s maybe like 5/6 years old,seen better days but I picked it up fairly cheap so can’t complain about giving it some TLC.
I see there is a bolt that goes through the crank into the bottom bracket, I assume this would mean it’s a 3 piece set up?

Sent from my iPhone using Tapatalk