Bicycles

Questions tagged [torque-wrench]

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Torque wrench doesn't click

I have a new and calibrated torque wrench that is for 2-15NM. When I'm tightening a bolt it doesn't seem to click even at 2NM no matter how hard I turn. I tried using it against a same size hex key ...
1
vote
0answers
113 views

Click/snap sound while fastening brake lever onto carbon bar

I was fastening Shimano STI levers onto Bontrager carbon drop handlebars yesterday, with my torque wrench set at ~2nm, and heard a short rather loud click/snap sound shortly after starting to tighten, ...
11
votes
4answers
3k views

Are rotor bolts designed to shear?

I was toying about with a disk brake for the first time and managed to shear two bolts clean off while reassembling. Curiously, both tore the head off, leaving the threadded shaft in the tapped hole ...
5
votes
2answers
767 views

torque wrench warm up procedure?

Does anybody have a suggested "warm up" procedure for a small 1/4" drive torque wrench? I've searched the internet and found surprisingly little on this topic. Here is how I've been doing it so far: ...
3
votes
4answers
328 views

Torque wrenches

How do I determine the torque required for different bolts, etc.? I am new to the world of torque wrenches and have not purchased one yet. I am suffering from chronic loosening of the left side crank ...
5
votes
2answers
254 views

How can I assess my torque wrench?

I have owned a dynamometric wrench for two years now, and I got it second-hand in the first place. I fear that relying on its indication could be even less accurate than tightening by intuition. For ...
0
votes
1answer
521 views

Shimano FC-M521 middle chainring replacement

What exact torque should be applied to secure the double gear fixing bolt (Y-1FM98020) ? And what tool is usually used to fix the nut without damaging it while tightening the bolt?
1
vote
1answer
2k views

Over-tightening a BB

I just installed an external bottom bracket (Hollowtech II type) on my steel bike. The manufacturer (Sugino) prescribes a 40-50Nm torque. I own no torque wrench, so I just wrenched it on pretty tight. ...
1
vote
2answers
5k views

Need to know the wrench size for 10.9 screw

My pedal just unscrew. It has a hexagon-headed screw with '10.9' screw label. Anybody knows what size of wrench I need for this screw?
14
votes
3answers
42k views

Tightening torque: 5Nm, 40Nm… how do I tell?

I have wonderful new manuals everywhere, of brakes, wheels... In these manuals I see "tighten up to 5Nm", "tighten up to 40Nm". There must probably be tools with such measurements on them, but I don'...
2
votes
1answer
801 views

Italian bottom bracket Shimano BB-6400 fixed cup tightening - what tool?

All, 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 ...
4
votes
4answers
7k views

My crank fell off, how do I re-attach it?

I was out riding on my mountain bike when my crank unexpectedly fell off (video). How do I reattach the crank? There's a torque range specified (25-30 Ft-Lbs): how critical is this? I don't own a ...
5
votes
2answers
4k views

Is torque relevant for steel/aluminium? Where do I find torque specs?

When you are not dealing with carbon, is torque relevant? I've never seen it mentioned on the hundreds of answers here, or the hundreds of how-tos I've read elsewhere. Should I just tighten ...
17
votes
7answers
7k views

Why would I need a torque wrench for a bicycle?

I was rather surprised to find a question about choosing a torque wrench on this site. I haven't cycled for years, but many years ago when I actually cycled I would do with a set of ordinary wrenches ...
4
votes
2answers
663 views

What should I look for in a torque wrench?

It has come to the point where I need a torque wrench for installing things on my bicycle. What should I look for when purchasing one?
8
votes
4answers
5k views

How to objectively evaluate torque wrenches?

My local bicycle group bought very nice but very expensive torque wrenches (if I can remember right they cost about €300–500). My local discount store markets them for about €50. My local auction site ...
8
votes
2answers
943 views

Tightening a nut too much

Often guidance will be given to tighten a nut to "20 ft. lbs. (27 Nm)" or something along those lines. What's the best way to ensure you tighten things up, but don't over-tighten? Is there any way ...