Shimano Rear Derailleur Limit & Tension Screws Titanium 1.0 g vs R7170 3.0 g (2.0 g Saved)

Limit screws and tension screws on a Shimano rear derailleur are small — so small that most riders never think about them. But these two fasteners control the exact boundaries of your shifting: the high-limit screw prevents the chain from dropping off the small cog, the low-limit screw prevents overshifting into the spokes, and the tension screw sets the cage gap that determines chain wrap. On the 105 R7170, the stock pair weighs 3.0 g. TiNE's titanium replacement brings that to 1.0 g — a 2.0 g reduction that, while modest in isolation, is part of a larger weight-saving strategy across the entire rear derailleur.

Why These Two Screws Matter More Than Their Weight Suggests

Limit and tension screws are adjustment points — they sit at the back of the derailleur body and are turned with a small hex key to fine-tune shifting precision. On Shimano's 12-speed groups, the R7170 uses a separate steel screw for each function, while the R9270 Dura-Ace uses a lighter integrated design. The R8170 Ultegra sits between them.

The weight difference is most pronounced on the 105 R7170, where the stock steel pair is 3.0 g. On Dura-Ace R9270, the stock pair is already lighter at 0.8 g — so TiNE's 1.0 g titanium pair is actually slightly heavier than the stock Dura-Ace piece. This is one of the few TiNE products where the upgrade is weight-positive on the top-tier group. The value proposition is clearest for 105 R7170 riders.

Rear Derailleur Bolt-by-Bolt: Where the 2.0 g Fits

The limit and tension screw pair is one of five bolt positions on a Shimano rear derailleur. Combined with TiNE's other derailleur bolts, the cumulative savings add up — especially on the 105 R7170, where the steel stock is heaviest:

The limit and tension screw pair contributes 2.0 g of the 11.4 g total rear derailleur savings on the R7170 — roughly 18% of the derailleur's weight reduction. The pivot bolt is the largest single saver (6.4 g), followed by the jockey wheel screws (3.0 g), then the limit and tension pair (2.0 g).

Grade 5 Ti-6Al-4V, CNC machined, 8 anodized colors (gold, blue, rainbow, silver, black, pink, green, multi). Two-piece set: high-limit screw + tension screw. Best weight savings on 105 R7170 (2.0 g saved); moderate on Ultegra R8170 (1.0 g); weight-neutral on Dura-Ace R9270 (+0.2 g). Compatible with Shimano 12-speed 105 R7170, Ultegra R8170, and Dura-Ace R9270 rear derailleurs.