I have a Shimano 600 Italian-threaded bottom bracket (BB-6400) and after riding with it for a few weeks, the fixed cup is loosening. I've since read up about Italian BBs and learned that the correct amount of torque needs to be applied to the fixed cup, somewhere in the 600 in-lb range.

My guess is that my HCW-4 isn't quite cutting it to get me to that level. I'd like to tighten it correctly and am looking for the right tool. If I'm in the market for a torque wrench, what tool or combination of tools will fit the 36 mm cup and allow me to reach the right torque?


BB-6400 fixed cup

  • 1
    An easy way to tighten a fixed cup is to clamp it in a vice and turn the frame. – alex May 15 '13 at 6:08
  • @alex How does that allow you to measure the torque? Seems like it would be very easy to over-torque something when using the frame as a giant lever. – Kibbee May 15 '13 at 12:37
  • That's why I didn't add it as an answer, but it's a very common method. Just be careful :P – alex May 16 '13 at 0:33

This is the tool you want, combined with any torque wrench with the proper range.


There are a number of applications where a torque is specified by the manufacturer, but no tool fitting for a torque wrench is available.

The BBI Torque Wrench Adapter allows you to attach any "normal" wrench to a torque guage, and get an accurate measurement of the torque applied to the fitting.

I've used it with pedal and cone wrenches primarily, but it would work well with the HCW-4 on a fixed cup application.

BBI Adaptor in use

Barnett's Bicycle Institute Torque Wrench Adaptor

  • Just ordered this part. Looking forward to it! – fideli May 20 '13 at 17:50
  • How did this work out for you? – zenbike Apr 15 '16 at 18:41
  • Thanks for following up! It worked very well. Supremely expensive for a home wrencher like myself, but that cup has not loosened since I was able to torque it down with the help of this tool. – fideli Apr 15 '16 at 18:59
  • Good to hear. :-) – zenbike Apr 15 '16 at 19:00

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