bottom bracket torque

[gasinayr]

to what torque do you tighten bottom bracket cups

 

[presta]

Best to look up your specific BB, but typically 35-50Nm.

https://www.parktool.com/en-us/blog/repair-help/torque-specifications-and-concepts
https://si.shimano.com/en/pdfs/dm/TORQUE/DM-TORQUE-00-ENG.pdf

 

[FrankCrank]

Never used a torque wrench on a bike, just go by feel.

 

[ianrauk]

Just by feel. Unless the bottom bracket has a plastic cup then I give it some.

 

[Ajax Bay]

Depends what you mean by 'cups'. Cup and cone bearings have cups. Outboard BBs for a 24mm Shimano spindle might be colloquially called 'cups' but . . . There is no set torque for the left side cup: too tight and the cup will bind on the bearings. The right side cup is as tight as you can, plus a bit. Often never needs removal.

 

[cyclintom]

Never used a torque wrench on a bike, just go by feel.

That is a bad idea on carbon fiber bikes.

 

[FrankCrank]

That is a bad idea on carbon fiber bikes.

Yup - too used to bashing things with hammers - only steel and aly for me

 

[Ming the Merciless]

That is a bad idea on carbon fiber bikes.

Fragile things

 

[Big John]

Fragile things indeed. Saying that, I've had my carbon fibre bike for must be 17 ISH years now and I've never invested in a torque wrench and it still runs fine despite having every part replaced over the years. The damage on my bike has always been caused by a crash or similar catastrophic event. They don't bend or dent, they crack or snap. Well, that's what's happened to mine. I only bought carbon because everyone else that I raced with had carbon. Purely a personal choice but I wouldn't buy another one but then i don't need one. I'm happy riding Reynolds 531 at a much more leisurely pace.

Edit: My carbon bike is very much like Triggers Broom lol.

 

[gasinayr]

tightened my bottom bracket to 46 n/m So far all is good.

 

[Ajax Bay]

Nm