Shimano Pivot Bolt 2.0 g vs Stock 8.4 g R7170 (6.4 g Saved)

The 105 R7170 rear derailleur uses a larger, heavier pivot bolt design compared to the Ultegra R8170 and Dura-Ace R9270. Shimano's tiered component philosophy means lower groupsets use more material in structural bolts — the R7170 pivot bolt at 8.4 g is roughly 2.8x heavier than the R8170/R9270 bolt at 3 g each.

TiNE makes version-specific pivot bolts that match each derailleur's threading and length requirements. All three versions weigh 2.0 g — the R7170 version simply saves more because its stock bolt starts heavier.

TiNE makes three pivot bolt versions:

R7170 (105 Di2) — stock 8.4 g, TiNE 2.0 g, saves 6.4 g. This is the version with the largest savings.

R8170 (Ultegra Di2) — stock 3 g, TiNE 2.0 g, saves 1.0 g.

R9270 (Dura-Ace Di2) — stock 3 g, TiNE 2.0 g, saves 1.0 g.

Each version has specific threading and bolt length matching that derailleur's pivot interface. Confirm your groupset version before ordering.

Yes — the "pivot bolt" and the "derailleur mounting bolt" refer to the same component. It is the bolt that passes through the derailleur pivot point and threads into the frame's derailleur hanger. This single bolt carries the entire derailleur's weight and shifting force, making it one of the most structurally important bolts on the bike.

TiNE's Grade 5 Ti-6Al-4V version maintains full structural integrity at 2.0 g — titanium's higher specific strength (strength-to-weight ratio) compared to steel means the bolt can be lighter without compromising load capacity.

TiNE's pivot bolt versions are currently specified for the electronic Di2 groupsets (R7170, R8170, R9270). Mechanical Shimano derailleurs (105 R7000, Ultegra R8000, Dura-Ace R9100) may use different pivot bolt dimensions.

Check with TiNE for mechanical derailleur compatibility before ordering — the Di2-specific bolt threading may not match mechanical derailleur pivot interfaces.