M4 x 18mm Titanium Rear Derailleur Tension Bolt for Shimano R8150 / R9250 Road Bike

Description
Upgrade your Shimano R8150 or R9250 rear derailleur with this ultra-lightweight M4 x 18mm titanium tension bolt. Machined from aerospace-grade Grade 5 Titanium (Ti-6Al-4V), this bolt offers superior strength, rust resistance, and weight savings over the stock steel version.

Ideal for road cyclists who prioritize performance and durability, this bolt is designed to secure the derailleur body under constant chain tension. Whether you're shaving grams for race day or simply replacing corroded OEM hardware, this is a small but impactful upgrade.

Specifications:

• Material: Grade 5 Titanium (Ti-6Al-4V)
• Fitment: Shimano Dura-Ace R9250 / Ultegra R8150 rear derailleurs (12-speed Di2)
• Size: M4 x 18mm
• Quantity: 1 pc
  
• Weight: 0.65g
  
• Tool: 2mm Hex Key
• Color: Gold, Rainbow, Titanium, Black, Blue, Green, Purple, Candy, Indigo

Features

• Precision CNC-machined threads for optimal fit
• Excellent corrosion resistance — perfect for all-weather riding
• Compatible with Shimano 12-speed Di2 road derailleurs (R8150/R9250)
• Lightweight construction without compromising durability

Note
Please double-check the compatibility and length with your original derailleur bolt before purchase.