Shimano Front Derailleur Bolt+Spacer Titanium 1.8 g vs Stock 4.0 g (2.2 g Saved)

The front derailleur mounting bolt and spacer set attaches the derailleur to the braze-on mount on the frame. Across 105 R7170, Ultegra R8170, and Dura-Ace R9270, the stock set weighs 4.0 g. TiNE's titanium bolt with matching spacer drops that to 1.8 g, saving 2.2 g on a small but essential piece — the only fastener that prevents your front derailleur from separating from the frame under shifting load.

Why a derailleur mounting bolt matters for shifting precision. The front derailleur bolt does more than hold the derailleur in place — it defines the derailleur's position relative to the chainring. Any flex at this mounting point translates directly into chain rub and missed shifts under load. Titanium's higher yield strength (~880 MPa vs ~275 MPa for typical aluminum spacers) means the mount stays rigid under the lateral forces that cable tension and chain pull generate during aggressive shifting.

What the Set Includes — Bolt + Spacer

The TiNE set replaces both the mounting bolt and the alignment spacer that Shimano ships with each front derailleur. The bolt threads into the frame's braze-on tab; the spacer sits between the derailleur body and the frame, setting the derailleur's lateral offset to match the chainring position. TiNE machines both pieces from Grade 5 Ti-6Al-4V — the bolt for its superior yield strength at the thread, and the spacer for its resistance to compression under cable tension.

Shimano Derailleur Bolt Savings — Full Picture

The front derailleur bolt+spacer is one of four TiNE titanium replacements in Shimano's derailleur system. Combined savings through the entire derailleur:

Grade 5 Ti-6Al-4V, CNC machined, 8 anodized colors (gold, blue, rainbow, silver, black, pink, green, multi). The titanium bolt+spacer set maintains derailleur alignment under full cable tension — no flex, no missed shifts. One set covers Shimano 105 R7170, Ultegra R8170, and Dura-Ace R9270 braze-on front derailleurs.