Another 'what are these bits?' thread

[simon.r]

They were supplied with an Ultegra 6800 front mech. 1 1/8" top cap for scale.

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[Salty seadog]

They are some sort of striking plate to go on the seat tube to protect from a certain type of front mech setup. Thats roughly how it was explained to me. It's highly unlikely that you need them if they are not already fitted.

I'll try and dig out the answer I was given....hang fire.

 

[Nibor]

Plagiarised from Bike Radar

They're adhesive pads to protect the frame against the rotation angle screw if you have a braze on front mech.

If you use a band on front mech they aren't required as you can just rotate the mech to get the position right in relation to the chainrings, if however you're using a braze on front mech there's a rotation angle screw that sets the angle of the mech to the chainrings by pushing against the frame and you stick these little pads to the frame to stop it getting damaged by the screw.

Check out figs 3-7 on this guide http://www.parktool.com/blog/repair-help/di2-shimano-electronic-intelligent-system-installation-1

 

[Salty seadog]

Here's the thread where I asked the same question.

https://www.cyclechat.net/threads/what-are-these-for.203520/