Shimano 105 RD-5800 Cable Adjusting Bolt Unit - Y5YE98030

I recommend this product

I used this to replace a broken Ultegra adjuster. By comparison, this 105 adjuster is a simpler, classic design that simply works. It feels more solid and is easier to adjust.

I recommend this product

Swapping like for like, so very easy really. Everything fitted and worked as it should.

I recommend this product

Its only small in size and cost but keeps your rear changing nice and sweet.
Love SJS carrying these small spares which can be hard to find elsewhere, it keeps me coming back for bigger stuff.

I recommend this product

These adjusters need to be replaced every so often to keep the derailleur changing sweet. The changing cable wears these pieces and if left will form a groove into the derailleur causing it not to change correctly by snagging on the outside of the derailleur housing. Excellent piece of essential kit.