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Bottom bracket question..
I replaced my bottom bracket (Praxis M30) in Feb as the bearings felt rough and I had a bit of a creak when putting down a bit of power. I've just noticed the same sort of creak, and removing the cranks this weekend, the bearing on the non-drive side of the BB feels really rough again. It's not something that's noticeable when pedalling, and actually the pedals feel ok when spinning, but just spinning the bearing with a finger feels awful - not smooth at all like the drive side. Do I need to replace it? & does that suggest I'm doing something wrong?! 3 months for a BB seems to suggest I am.
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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- mdavidford 55 sec ago
Um - whether or not you're intended to continue cycling past it, it's still a chicane....
- Bungle_52 18 min 44 sec ago
The answer is 70 apparently. https://www.mirror.co.uk/news/world-news/tear-jerking-powerful-video-ask...
- chrisonabike 19 min 15 sec ago
Since (relatively) shortly after the carboniferous! Or perhaps the mesolithic?
- Sredlums 55 min 58 sec ago
DAMN THAT'S… let's say, not my taste 😏
- Sredlums 1 hour 45 min ago
It's so tiring, all these brands using eloquent marketing language to show how unique and premium they are....
- chrisonabike 1 hour 47 min ago
Nearly... (more so in the US - the problem is are they aware of their passengers and the humans around them?)
- Paul J 1 hour 53 min ago
My condolences to David Lang's family. It really is terrible....
- Seagull2 2 hours 38 min ago
I am so sad to read about the loss of Aidan, my heartfelt condolences to his family and friends and team-mates
- mdavidford 2 hours 51 min ago
With most lights, though, this approach will quickly lead to your light flapping loosely while pointing mostly at your front wheel.
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7 comments
looks like the same arrangement as SRAM gxp, and if so clamps the nds bearing both sides and wrecks it in short order, especially if the frame is not correct in the bottom bracket area.
When you say 'less torque', are you actually installing it as per this video? It says the M30 should tighten up until the thread bottoms out and that is the correct torque.
https://youtu.be/TB-PovRMeco
PP
Hi Pete,
I was referring to the crank bolt, which is what bechdan said he meant by preload bolt - that has a rated torque. I have a BSA threaded BB, not like the one in that video, and its rated to 40nm...
Premature bearing failure is often due to over tightening the crank preload bolt
Forgive my ignorance - what's the preload bolt? I've never touched anything other than the main bolt to remove the crank, and I've always made sure that's at the correct torque.
Yeah that will be it, same bolt different name. Seems strange it's the non drive side so could indicate a fault with the bearing or possibly damaged during installation. Can't think of anything else. I would replace the bearing then and monitor mileage.
Ah ok. I'll try slightly less torque maybe and keep an eye on it. Ta!