Torque settings...

[migrantwing]

What a f*ckin' pain in the ass it is, trying to find the specified torque settings for various components of my bike. The Shimano website is very informative, but a complete maze. Haven't even tried to find info on the FSA site, yet.
Why don't they just throw in a little piece of paper with all you need to know on when you buy a new bike?

 

[Gareth]

Unless there are specific torque setting instructions with a component, I use this general guide from Norbar torque wrenches for all "none-specific" bolt tightening that I do in my workshop. For bolts, set screws, and cap/socket head screws used on bicycles you only need the 3mm to 12 mm diameter section of the tables on page 2 ..... Imperial grades and sizes are also shown

Note: most high tensile bolts, set screws, and cap/socket head (Allen key) screws are grades 8.8, 10.6, 12.9 and will normally have the grade they are stamped/cast on to them. If the grade markings are not shown, then assume they are low tensile bolts and use the figures for grade 3.6.

 

[migrantwing]

Thank you, Gareth! Very kind of you to share this information. After trawling thru the Shimano pages, I found the suggested torque settings for my 105 groupset. However, there are many other non-Shimano components on my bike, so the pdf. you have attached will come in extremely useful.

Thanks, once again.

Lloydy

 

[Gareth]

Lloydy,

This PDF document may be of interest to you; it is the common head markings for different grades of bolt. Although I am all metric I have a copy of the first page of the doc on my workshop wall for quick reference on the odd occasion that Imperial size bolts appear on stuff bought in from the USA, or older stuff that comes in for repair.

 

[slowmotion]

If you can get access to Zinn and the Art of Road Bike Maintenance, there are pages and pages of torque setting listings at the back of the book.

http://www.amazon.co.uk/dp/19340304...de=asn&creative=22206&creativeASIN=1934030422

 

[subaqua]

of course you need to take into account the materials you are bolting together when ascertaining the correct torque. it is possible a high tensile bolt is used to hold two softer bits of kit together. the figure on the head of the bolt is generally the MAXIMUM torque that can be applied. having seen several expensive bits of electrical engineering borked due to somebody reading the MAX figure from the bolts head code i suggest checking the manufacturers recommendation. tightening in stages is also highly recommended.

after rebuilding the bikes over the weekend i can confirm that all the bolts on the SRAM x7 derailleurs and shifters are 5-7Nm.

shimano RD hanger to RD is 8-10Nm all other RD and FD bolts are 5-7Nm, STi shifters are 6-8 Nm to fit to handlebars.

shimano techdocs are superb information dockets as is the SRAM tech manual, all avaialble to download from the websites of the manufacturers. can even get the parts manuals too for ordering the right spares .

Decathlon give you a disc with most of this on and also a case with all the paper sheet install/repair instructions.

 

[Gary E]

To make sure any size bolt is properly torqued simply follow this simple procedure:

Tighten bolt up until it shears and then back it off a quarter turn, simples

Hope this helps

 

[migrantwing]

If you can get access to Zinn and the Art of Road Bike Maintenance, there are pages and pages of torque setting listings at the back of the book.

http://www.amazon.co.uk/dp/19340304...de=asn&creative=22206&creativeASIN=1934030422

I believe my friend has a copy of the Zinn book. Thanks, slowmotion!

 

[migrantwing]

Lloydy,

This PDF document may be of interest to you; it is the common head markings for different grades of bolt. Although I am all metric I have a copy of the first page of the doc on my workshop wall for quick reference on the odd occasion that Imperial size bolts appear on stuff bought in from the USA, or older stuff that comes in for repair.

Thanks, once again, Gareth!

 

[migrantwing]

of course you need to take into account the materials you are bolting together when ascertaining the correct torque. it is possible a high tensile bolt is used to hold two softer bits of kit together. the figure on the head of the bolt is generally the MAXIMUM torque that can be applied. having seen several expensive bits of electrical engineering borked due to somebody reading the MAX figure from the bolts head code i suggest checking the manufacturers recommendation. tightening in stages is also highly recommended.

after rebuilding the bikes over the weekend i can confirm that all the bolts on the SRAM x7 derailleurs and shifters are 5-7Nm.

shimano RD hanger to RD is 8-10Nm all other RD and FD bolts are 5-7Nm, STi shifters are 6-8 Nm to fit to handlebars.

shimano techdocs are superb information dockets as is the SRAM tech manual, all avaialble to download from the websites of the manufacturers. can even get the parts manuals too for ordering the right spares .

Decathlon give you a disc with most of this on and also a case with all the paper sheet install/repair instructions.

Thanks, subaqua. Shame that some suppliers don't give you the same extras as Decathlon.

 

[migrantwing]

To make sure any size bolt is properly torqued simply follow this simple procedure:

Tighten bolt up until it shears and then back it off a quarter turn, simples

Hope this helps

Thanks for your wisdom, Gary E