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Steerer Plug Bolt - Replacement

Posted: Mon Aug 27, 2018 5:29 pm
by avispa
Iā€™m trying to replace the cheap steerer tube plug bolt that comes with my Pinarello F10 for one made out of stainless steel or titanium.

I am doing this mostly to prevent corrosion not for weight savings.

Do any of you know a good source to find such screws?

I am not even sure what type screw this would be (such as M5, M6, etc.)

Thanks!

Re: Steerer Plug Bolt - Replacement

Posted: Mon Aug 27, 2018 6:15 pm
by sungod
which country?

to find the size, just take out the old bolt and measure it

https://www.pro-bolt.com/ are good, there are many others

Re: Steerer Plug Bolt - Replacement

Posted: Mon Aug 27, 2018 6:15 pm
by Weenie

Re: Steerer Plug Bolt - Replacement

Posted: Mon Aug 27, 2018 6:45 pm
by Orlok
Put a black plastic cap (find at the construction market) on top of it, this will prevent water and dust.! :wink:

Re: Steerer Plug Bolt - Replacement

Posted: Mon Aug 27, 2018 6:56 pm
by bremerradkurier
In a happy coincidence, the gold anodized alloy cantilever bolt from a set of Magura hydraulic brakes happened to fit into my Neco steer tube expander.

Re: Steerer Plug Bolt - Replacement

Posted: Wed Aug 29, 2018 2:24 am
by avispa
Orlok wrote: ā†‘
Mon Aug 27, 2018 6:45 pm
Put a black plastic cap (find at the construction market) on top of it, this will prevent water and dust.! :wink:
Nope, they do come with that plastic cap and it's useless...

Re: Steerer Plug Bolt - Replacement

Posted: Wed Aug 29, 2018 2:26 am
by avispa
sungod wrote: ā†‘
Mon Aug 27, 2018 6:15 pm
which country?

to find the size, just take out the old bolt and measure it

https://www.pro-bolt.com/ are good, there are many others
USA... But this web site is cool! What's the best way to measure a bolt to find it's size? Well, to find if it is a M6, M5 or whatever... :oops:

Re: Steerer Plug Bolt - Replacement

Posted: Wed Aug 29, 2018 6:51 am
by motorapido
The M means metric and the number is the bolt thread diameter in millimeters, their are various pitches of thread but most bike bolts are a standard coarse thread bolt.
A vernier is the best tool to measure the bolt but eyeballing it with a ruler should be easy enough to determine its size. the expander bolt you are looking to replace usually M6.

Re: Steerer Plug Bolt - Replacement

Posted: Thu Aug 30, 2018 12:58 pm
by Lewn777
I think those bolts need around 5-6nm or torque, so I might buy very high quality alu alloy (careful the average alu bolt will thread like butter over 4nm). Or preferably 'good' titanium alloy. Varies by manufacturer, but you probably want M5x30-40mm. A full metal jacket steel bolt is around 8g-10g. So you can potentially shave off 5g or so, which considering it's a single bolt is a heck of a lot! I just switched by stock steel bolt to titanium on my bike today and saved about 4g. :thumbup:

Re: Steerer Plug Bolt - Replacement

Posted: Thu Aug 30, 2018 1:07 pm
by avispa
Lewn777 wrote:I think those bolts need around 5-6nm or torque, so I might buy very high quality alu alloy (careful the average alu bolt will thread like butter over 4nm). Or preferably 'good' titanium alloy. Varies by manufacturer, but you probably want M5x30-40mm. A full metal jacket steel bolt is around 8g-10g. So you can potentially shave off 5g or so, which considering it's a single bolt is a heck of a lot! I just switched by stock steel bolt to titanium on my bike today and saved about 4g. :thumbup:
Thanks for the info!

Where Did you purchase your bolt?

Re: Steerer Plug Bolt - Replacement

Posted: Thu Aug 30, 2018 1:16 pm
by Lewn777
avispa wrote: ā†‘
Thu Aug 30, 2018 1:07 pm
Lewn777 wrote:I think those bolts need around 5-6nm or torque, so I might buy very high quality alu alloy (careful the average alu bolt will thread like butter over 4nm). Or preferably 'good' titanium alloy. Varies by manufacturer, but you probably want M5x30-40mm. A full metal jacket steel bolt is around 8g-10g. So you can potentially shave off 5g or so, which considering it's a single bolt is a heck of a lot! I just switched by stock steel bolt to titanium on my bike today and saved about 4g. :thumbup:
Thanks for the info!

Where Did you purchase your bolt?
Found a bolt in my 'non-magnetic' bolt pile! :thumbup:

Re: Steerer Plug Bolt - Replacement

Posted: Fri Aug 31, 2018 1:04 am
by alcatraz
Check your bolt piles for hidden treasure people! :thumbup:

Re: Steerer Plug Bolt - Replacement

Posted: Fri Aug 31, 2018 1:04 am
by Weenie