I was cleaning my road bike and found this small black rubber cap on the floor after I was finished. Any ideas where it is from? Groupset is 12spd di2 ultegra. Added lego and chain for scale 🙂
by styppen
I was cleaning my road bike and found this small black rubber cap on the floor after I was finished. Any ideas where it is from? Groupset is 12spd di2 ultegra. Added lego and chain for scale 🙂
by styppen
6 Comments
Take a look at your brake calipers and compare front / back. It looks like a dust rubber cap for the bleedig port. Just push it back in if you find the hole.
Rubber plug for one of the bottle cage mounting points maybe?
Thought it was a cap for the lego figure lol.
Could be a plug for the bolt head of your stem cap
Bleed port cover for a Shimano caliper
Thanks everyone! It belongs to the disc calipers indeed. According to Shimano docs, the part is [Bleed boss cap, item no. 7](https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/ev/ev/EV-BR-R8170-4860C.pdf).