Torque wrench for bottom brackets
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Torque wrench for bottom brackets
Bought this Calibrated torque wrench to install a BB into my bike. Turned out it measures the torque only when the pressure is applied clockwise. If I select the opposite direction the wrench ignores the torque preset. Not good for the drive side BB cup.
Did I get a wrong tool? Did I miss some clever trick to reverse the torque direction?
Did I get a wrong tool? Did I miss some clever trick to reverse the torque direction?
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Just crank it down really tight. Nobody really uses a torque wrench on a bottom bracket.
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I don't know if there is a way to get a reverse torque reading with that wrench but some of the other ones on that Amazon page say "dual directional" so you may want to return it for a more suitable one. However, beam-type torque wrenches are all dual directional, less expensive for similar quality and won't go out of calibration unless you bend something.
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It's a click-type wrench. It doesn't read torque; it only gives an audible click and tactile release when the set torque is reached. On every reversible torque wrench I've used, it releases at the set torque in both directions.
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Pfft. I do.
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The BB cups/shell are probably one of the less torque critical joints on a bike. I’d be much more worried about the fasteners securing the crank arm. That said, using the proper tool and process certainly never hurts.
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Get a beam-type torque wrench. Those work in both directions and don't go out of calibration as easily as the pre-set type.
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https://www.amazon.com/GearWrench-29.../dp/B01CDJEAJW
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Another who's never used a torque wrench on a fixed cup. For the left hand thread ones, why? As long as your bearings are in reasonably good shape and you pedal, not coast all the time, your pedaling and the bearings mean you are constantly tightening the cup. I'm not super strong. I can get the cup tight enough with a 12" crescent. And too tight? Well I suppose you could break the base of the cup threads at the flange. Or rip out the steel threads. I'd love to have that kind of strength but my bikes might not be safe! Or, more likely, make it very difficult for you or someone else to unscrew it later.
Now right hand threaded fixed cups? Again, I've never had the torque wrench but I used to hang my Peugeot over my dad's bench vise, grab the cup with the jaws, then use the bike frame as my two-handed wrench handle. Avoided French BBs every since. Haven't killed a BB yet so I've never needed Italian.
Now right hand threaded fixed cups? Again, I've never had the torque wrench but I used to hang my Peugeot over my dad's bench vise, grab the cup with the jaws, then use the bike frame as my two-handed wrench handle. Avoided French BBs every since. Haven't killed a BB yet so I've never needed Italian.
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I don't know if there is a way to get a reverse torque reading with that wrench but some of the other ones on that Amazon page say "dual directional" so you may want to return it for a more suitable one. However, beam-type torque wrenches are all dual directional, less expensive for similar quality and won't go out of calibration unless you bend something.
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Yeah, that was my problem. I left my beam-style torque wrench in the closet where I store my bike stuff instead of in my workbench for some reason and some boxes shifted and bent it. Now, it's just a 1/2" drive wrench with a long cheater bar. Fortunately, it wasn't very expensive on amazon.
Obviously this depends on how bent it is, but beam style torque wrenches are remarkably simple devices.
One the lab experiments early in engineering school was taking a cylinder of unknown steel set up as a cantilever beam and predicting deflection at different force values. Basically making a beam style torque wrench. Even with the abused steel rods we had and not knowing the alloy we were well within what would be acceptable for error on common fastener applications.
Follow on notes for those curious as to why I say this:
There are only a few things that matter on a beam style torque wrench:
1. Length of the beam being bent. This won't change.
2. Stiffness of the being being bent. As long as the cross section hasn't been reduced the stiffness won't change either.
3. Where the pointing beam is pointing/where the scale is. Those two items are just static objects, they don't do anything when the tool is used. There isn't enough axial movement in the scale to get very far off, and you can determine where the side to side position should be based on the reading at zero.
The only thing that's likely to cause an issue is the joint at the head getting broken such that there is lash or play in the joint. This would result in an inconsistent zero position, which would be an issue.
The other thing of note is that it's important to put a point load, not a moment, on the handle. This is why the better ones have a handle that pivots on a pin. You need to make sure the handle does not touch the beam anywhere other than the pin when using the tool.
Last edited by jccaclimber; 07-18-22 at 11:15 AM.
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Well, you can torque the DS and get a good feel for how much effort it takes. Then using the same wrench and reversing it, tighten the NDS.
John
John
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Good point. The pointer was bent in to touch the scale as well as sideways, so I just figured it was toast as far as accuracy without testing (it does have a pivoting handle). I bought it to use for BB's but, like many people here, I just crank them really hard and call it a day most of the time (though 3 of the last 4 I've replaced have all been Italian-threaded, so this style is the only style that would give me an accurate reading).
#21
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I agree that the accuracy and precision of the amount of torque applied to fixed cup isn’t critical. Wang it down and that should be good enough!
I have both beam and click type torque wrenchs for the times that are more critical. In the case of the beam type, one’s line of sight must (should) be perpendicular to the scale to be both accurate and precise. The click type doesn’t require this. The click types that I have are from Harbor Freight. Perhaps not the highest quality nor most accurate or precise but for Joe/Josie Home Mechanic, prolly close enough. I have a 1/2” drive & 1/4” drive that covers nearly all of my needs.
Or one could use Sheldon Brown’s Tork-Grip https://www.sheldonbrown.com/tork-grip.html
I have both beam and click type torque wrenchs for the times that are more critical. In the case of the beam type, one’s line of sight must (should) be perpendicular to the scale to be both accurate and precise. The click type doesn’t require this. The click types that I have are from Harbor Freight. Perhaps not the highest quality nor most accurate or precise but for Joe/Josie Home Mechanic, prolly close enough. I have a 1/2” drive & 1/4” drive that covers nearly all of my needs.
Or one could use Sheldon Brown’s Tork-Grip https://www.sheldonbrown.com/tork-grip.html
Last edited by sovende; 07-18-22 at 01:29 PM.
#22
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You torqued the other side right? So just get a feel for what it takes to make it click and do the other side by feel. It'll be close enough.
#23
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#24
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Bought this Calibrated torque wrench to install a BB into my bike. Turned out it measures the torque only when the pressure is applied clockwise. If I select the opposite direction the wrench ignores the torque preset. Not good for the drive side BB cup.
Did I get a wrong tool? Did I miss some clever trick to reverse the torque direction?
Did I get a wrong tool? Did I miss some clever trick to reverse the torque direction?