Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Ultegra fixing bolt torque?

Road Cycling ďIt is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.Ē -- Ernest Hemingway

Ultegra fixing bolt torque?

Old 06-26-19, 02:58 PM
  #1  
Lrdchaos
Senior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 48 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Ultegra fixing bolt torque?

Iím going to pick up a left crank power meter from a buddy for a killer price. I have the tool to remove to fixing bolt on the left crank arm, how tight should the bolt be when I reinstall? Does it require any type of loctite?
Lrdchaos is online now  
Old 06-26-19, 03:11 PM
  #2  
MagicHour
Senior Member
 
MagicHour's Avatar
 
Join Date: Aug 2013
Location: NYC
Posts: 831
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 74 Post(s)
Liked 1 Time in 1 Post
If you're talking about the plastic cap bolt - Shimano says .7-1.5 Nm. I just hand tighten with tool by feel, similar to how you'd tighten a headset cap. Take out the play and maybe a tighten a little more, as long as it doesn't bind.
The actual Crank arm fixing bolts are 12-14 Nm, which I believe is critical for accuracy if you are installing something like a Stages, 4iiii etc arm.

Use a little grease on cap and bolts but NO loctite!
MagicHour is offline  
Old 06-26-19, 03:16 PM
  #3  
Lrdchaos
Senior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 48 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Yes on the attachment bolts, I have a in/lb torque wrench so it should be right at 102-105in/lbs. Thanks on the grease, it looks like metal but I guess itís plastic.

Last edited by Lrdchaos; 06-26-19 at 03:22 PM.
Lrdchaos is online now  
Old 06-26-19, 03:18 PM
  #4  
MagicHour
Senior Member
 
MagicHour's Avatar
 
Join Date: Aug 2013
Location: NYC
Posts: 831
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 74 Post(s)
Liked 1 Time in 1 Post
Yeah that's the one. On my 6800 I'm pretty sure that part is plastic maybe 8000 is alloy? Anyhoo, same principal tool looks like this or is sometimes attached to BB wrench, eg
Park Tool.

Just for clarity all this part does is pre-load the Bottom Bracket bearings; the two 5mm allen bolts are what actually hold crankarm to spindle.


Last edited by MagicHour; 06-26-19 at 03:22 PM.
MagicHour is offline  
Old 06-26-19, 03:19 PM
  #5  
DrIsotope
Non omnino gravis
 
DrIsotope's Avatar
 
Join Date: Feb 2015
Location: SoCal, USA!
Posts: 6,989

Bikes: Nekobasu, Pandicorn

Mentioned: 104 Post(s)
Tagged: 0 Thread(s)
Quoted: 3785 Post(s)
Liked 299 Times in 207 Posts
The crank fixing bolt is just for preload-- some are metal, some are plastic, you can buy rainbow colored ones from China. The supplied tool from Shimano is made of plastic and you tighten it with your fingers. The torque spec I've always used is "snug."

The pinch bolts (as mentioned in post 2) are important and should be torqued to spec.
__________________
DrIsotope is online now  
Old 06-26-19, 03:23 PM
  #6  
Lrdchaos
Senior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 48 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Thank you!
Lrdchaos is online now  
Old 06-26-19, 05:41 PM
  #7  
TimothyH
- Soli Deo Gloria -
 
TimothyH's Avatar
 
Join Date: Aug 2015
Location: Northwest Georgia
Posts: 14,566

Bikes: 2018 Rodriguez Custom Fixed Gear, 2017 Niner RLT 9 RDO, 2015 Bianchi Pista, 2002 Fuji Robaix

Mentioned: 229 Post(s)
Tagged: 0 Thread(s)
Quoted: 6684 Post(s)
Liked 548 Times in 348 Posts
The Shimano Technical Documents website will have the torque spec for everything. All Shimano questions should start with this site.

https://si.shimano.com/


Page 19 of the FC-6800 dealer manual says the plastic cap is 0.7 to 1.5 N-m while the pinch bolts are 12 to 14 N-m.






-Tim-
TimothyH is offline  
Likes For TimothyH:
Old 06-26-19, 08:00 PM
  #8  
jadocs
Senior Member
 
jadocs's Avatar
 
Join Date: Jul 2018
Location: USA
Posts: 822

Bikes: Litespeed T2 Disc, Fondirest P4 Carbon, Fuji Cross 2.0, Specialized Fatboy

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 342 Post(s)
Liked 79 Times in 62 Posts
Yep finger tight. If you remove your chain spin the cranks and pay attention to how freely it spins. Then pay attention to how tight it feels when you loosen the compression cap. When reassembling make sure both cranks are seated properly in the BB, go finger tight in the compression cap, torque the other bolts to spec (donít torque one side and then the other...do a little on each side at a time until they both are to spec). Spin the crank to make sure itís not binding and spins freely as before. Then your good.
jadocs is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.