Front sprocket nut

Ron1000 · 12-12-2019, 10:19 PM

Guys,
I’ve got my front sprocket nut listed at 186nm tightening. Anybody know if that’s correct. Seems awfully awfully tight.

Rrawlings · 12-12-2019, 11:18 PM

I have just had a look at the list of settings I got from Luddite and indeed is 186nm. When I swapped front sprocket for 14t it was a pig to get off. Was a compressor and impact gun job. Tried it with the old two men one on the bike the other with a breaker bar and it wouldn't budge. Seems daft when there is a tab washer to stop it moving that the setting is so high. My torque wrench does 150 so it went back at that

Ron1000 · 13-12-2019, 08:08 AM

Cheers Rawlings. Yeah. I’ve got a torque wrench up to 220nm so might as well do it.

chris.p · 13-12-2019, 01:12 PM

make sure you put some copperslip on the threads.

Ron1000 · 13-12-2019, 02:05 PM

Will do Chris

Darren69 · 15-12-2019, 02:10 PM

I suppose its called the Jeezus nut for a reason!

Seems a bit excessive though if you have a tab washer and less torque in the engine to undo it? 748/916 wheel nut is the same silly spec, c-clipped and lockwired too but its reassuring as you do actually need the rear wheel to stay on!

Ron1000 · 15-12-2019, 02:45 PM

Put it on yesterday, couldn’t actually get it to 186nm. Between the chain ‘stretch’ and the back brake no holding it. I only got to 160nm, it’s got a lock tab anyway so it’s definitely not moving.

Rrawlings · 15-12-2019, 06:58 PM

I remember changing chain and sprockets on my 1050 Sprint St when I tapped the washer flat the front sprocket nut wasn’t anything but finger tight and I did several thousand miles unaware of it!

Desmo Dreaming · 13-01-2020, 03:28 PM

Do people actually use torque wrenches? I own one but I can't remember ever using it. I tend to tighten everything until I make an involuntary 'old man noise' and leave it at that. I havent had anything fall off a bike yet.

** To clarify, 'old man noise' is similar to the noise you make getitng up off the sofa if you are over 45 **

Luddite · 13-01-2020, 04:12 PM

I have two, which I use, but not every time.

There's a Halfords 8-60 Nm, which is good for 95% of the fasteners on the Evo, and an unbranded 28-210 Nm, which only comes out for the rear wheel and sprocket nut.

Being paranoid about stripping a thread, I'll always use one if it's a steel screw into aluminium - crankcases for example. Also, if it's a critical fastener, such as disc rotor and caliper bolts or yoke pinch bolts. Oh, and the single-sided swinging arm pinch bolts too, as it's notoriously easy to damage the eccentric hub if you overtighten them.

(I still make the old man noise though!)

Ron1000 · 13-01-2020, 05:22 PM

I have three 1/4”, 3/8” and 1/2”. That covers everything I’ve ever come across. I use them very regular, just not on say minor stuff bolts for carbon fibre or that.

But The ‘dog tight’ method has got me in trouble before so I tend to avoid it.

Nickj · 13-01-2020, 05:52 PM

Just did mine up as tight as I could, it hasn't moved.
Some stuff that might distort like heads I go for the speced values

Flip · 13-01-2020, 10:37 PM

Quote:

Originally Posted by Luddite

Being paranoid about stripping a thread, I'll always use one if it's a steel screw into aluminium - crankcases for example.

That's just where I'm less likely to use one to be honest as I've known too many people strip out the thread where it has given up before reaching the torque so I tend to go by feel- especially on my old race bike.

Quote:

Originally Posted by Luddite

Also, if it's a critical fastener, such as disc rotor and caliper bolts or yoke pinch bolts. Oh, and the single-sided swinging arm pinch bolts too, as it's notoriously easy to damage the eccentric hub if you overtighten them.

I do use them for those kind of applications though and axle bolts of course.

I bought my Draper torque wrenches as a deal through college when I did my City and Guilds about 20 years ago- the fact they're still available and reasonably priced must say something. I even checked them at work recently and they're still calibrated fine too.

https://www.ebay.co.uk/itm/DRAPER-1-...MAAOSwImRYLd98

https://www.ebay.co.uk/itm/DRAPER-3-...kAAOSwVupTosEP

jerry · 14-01-2020, 04:00 AM

i use my 1/2''and 3/8'' a lot the 1/4 one less often i have 3 teng ones and 3 other brand ones

Darkness · 14-01-2020, 08:26 AM

Quote:

Originally Posted by jerry

i use my 1/2''and 3/8'' a lot the 1/4 one less often i have 3 teng ones and 3 other brand ones

Are torque wrenches the new bins? We need photo’s!

12-12-2019, 10:19 PM	#1
Ron1000 Registered User Join Date: Jun 2015 Location: Livingston Bike: M1100evo Posts: 867	Front sprocket nut Guys, I’ve got my front sprocket nut listed at 186nm tightening. Anybody know if that’s correct. Seems awfully awfully tight.

15-12-2019, 02:10 PM	#6
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,095	I suppose its called the Jeezus nut for a reason! Seems a bit excessive though if you have a tab washer and less torque in the engine to undo it? 748/916 wheel nut is the same silly spec, c-clipped and lockwired too but its reassuring as you do actually need the rear wheel to stay on! __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

13-01-2020, 05:52 PM	#12
Nickj Too much time on my hands member Join Date: Jun 2007 Location: Forest Of Dean Bike: S2r Posts: 3,208	Just did mine up as tight as I could, it hasn't moved. Some stuff that might distort like heads I go for the speced values __________________ "The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature

14-01-2020, 04:00 AM	#14
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,909	i use my 1/2''and 3/8'' a lot the 1/4 one less often i have 3 teng ones and 3 other brand ones __________________ MONSTERMAN

12-12-2019, 11:18 PM	#2
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	I have just had a look at the list of settings I got from Luddite and indeed is 186nm. When I swapped front sprocket for 14t it was a pig to get off. Was a compressor and impact gun job. Tried it with the old two men one on the bike the other with a breaker bar and it wouldn't budge. Seems daft when there is a tab washer to stop it moving that the setting is so high. My torque wrench does 150 so it went back at that

13-12-2019, 08:08 AM	#3
Ron1000 Registered User Join Date: Jun 2015 Location: Livingston Bike: M1100evo Posts: 867	Cheers Rawlings. Yeah. I’ve got a torque wrench up to 220nm so might as well do it.

13-12-2019, 01:12 PM	#4
chris.p Gold Member Join Date: Mar 2004 Location: lincoln Bike: No Bike Yet! Posts: 876	make sure you put some copperslip on the threads.

13-12-2019, 02:05 PM	#5
Ron1000 Registered User Join Date: Jun 2015 Location: Livingston Bike: M1100evo Posts: 867	Will do Chris

15-12-2019, 02:45 PM	#7
Ron1000 Registered User Join Date: Jun 2015 Location: Livingston Bike: M1100evo Posts: 867	Put it on yesterday, couldn’t actually get it to 186nm. Between the chain ‘stretch’ and the back brake no holding it. I only got to 160nm, it’s got a lock tab anyway so it’s definitely not moving.

15-12-2019, 06:58 PM	#8
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	I remember changing chain and sprockets on my 1050 Sprint St when I tapped the washer flat the front sprocket nut wasn’t anything but finger tight and I did several thousand miles unaware of it!

13-01-2020, 03:28 PM	#9
Desmo Dreaming Registered User Join Date: Apr 2012 Location: Newtown Bike: S4 Posts: 86	Do people actually use torque wrenches? I own one but I can't remember ever using it. I tend to tighten everything until I make an involuntary 'old man noise' and leave it at that. I havent had anything fall off a bike yet. To clarify, 'old man noise' is similar to the noise you make getitng up off the sofa if you are over 45

13-01-2020, 04:12 PM	#10
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	I have two, which I use, but not every time. There's a Halfords 8-60 Nm, which is good for 95% of the fasteners on the Evo, and an unbranded 28-210 Nm, which only comes out for the rear wheel and sprocket nut. Being paranoid about stripping a thread, I'll always use one if it's a steel screw into aluminium - crankcases for example. Also, if it's a critical fastener, such as disc rotor and caliper bolts or yoke pinch bolts. Oh, and the single-sided swinging arm pinch bolts too, as it's notoriously easy to damage the eccentric hub if you overtighten them. (I still make the old man noise though!)

13-01-2020, 05:22 PM	#11
Ron1000 Registered User Join Date: Jun 2015 Location: Livingston Bike: M1100evo Posts: 867	I have three 1/4”, 3/8” and 1/2”. That covers everything I’ve ever come across. I use them very regular, just not on say minor stuff bolts for carbon fibre or that. But The ‘dog tight’ method has got me in trouble before so I tend to avoid it.