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Article published at:
August 02, 2026
The double chainring locking bolt pair secures the inner and outer chainrings to the crank arm on two-piece cranksets. TiNE's Grade 5 Ti-6Al-4V pair weighs 2.0 g — an M8×6 bolt paired with an M7 nut, both CNC machined with double-sided hex interfaces for easy installation from either side of the crank.
| Component | Specification | TiNE Weight | Material |
|---|---|---|---|
| M8×6 bolt | M8 thread, 6 mm length | included in 2.0 g | Grade 5 Ti-6Al-4V · CNC |
| M7 nut | M7 thread, locking profile | included in 2.0 g | Grade 5 Ti-6Al-4V · CNC |
| Full pair (bolt + nut) | One locking pair | 2.0 g | — |
Frequently Asked Questions
| Question | Answer |
|---|---|
| What is a "double chainring locking bolt"? | On two-piece cranksets with separate inner and outer chainrings, the locking bolt pair clamps both chainrings to the crank arm simultaneously. The M8 bolt threads through the outer chainring into the M7 nut behind the inner chainring, sandwiching both rings to the arm. This is the standard mounting method on Shimano, SRAM, and most alloy cranksets with removable chainrings. |
| What does "double-sided hex" mean? | Both the bolt head and the nut have hex interfaces. You can tighten or loosen the pair from either side of the crank — insert a hex key from the outer side through the bolt head, or from the inner side through the nut. This is useful when one side has limited clearance (e.g., behind the crank arm near the chainstay). |
| How many pairs do I need per crankset? | Most two-piece cranksets use 4 locking bolt pairs (one pair per arm slot). TiNE sells pairs individually, so you need to order 4 pairs for a complete crankset conversion. At 2.0 g per pair, a full set of 4 weighs 8.0 g in TiNE titanium. |
| Does this fit one-piece cranksets with integrated chainrings? | No. One-piece cranksets (where the chainrings are permanently bonded to the spider) do not use locking bolt pairs — they use standard chainring bolts with single nuts. TiNE's locking bolt pair is designed for two-piece cranksets where both chainrings are removable from the spider. |
| Why titanium for chainring bolts? | Chainring bolts must hold full pedaling torque without loosening. Grade 5 Ti-6Al-4V's yield strength (~880 MPa) exceeds steel chainring bolt requirements. The M8+M7 pair maintains clamping force under repeated high-torque loading — sprint efforts, standing starts, and low-cadence climbing all stress these bolts. Titanium handles it without the weight penalty of steel. |
Double-sided hex = practical advantage. Stock steel locking bolts often have a hex interface on only one side (the nut), requiring you to reach behind the crank arm with a short hex key. TiNE's double-sided hex design lets you choose the access side — if the inner side is blocked by the chainstay, flip the hex key to the outer bolt head. No more struggling with blind-side hex key reach on cramped frames.
Grade 5 Ti-6Al-4V, CNC machined, 8 anodized colors (gold, blue, rainbow, silver, black, pink, green, multi). M8×6 bolt + M7 nut pair, double-sided hex interface on both bolt head and nut. 2.0 g per pair, 4 pairs needed for full crankset conversion (8.0 g total). Designed for two-piece cranksets with removable inner and outer chainrings.
TiNE Titanium Double Chainring Locking Bolt Pair
tinetech.com
2.0 g Pair · M8×6 Bolt + M7 Nut · Double-Sided Hex · Grade 5 Ti-6Al-4V · CNC · 8 Colors · Two-Piece Cranksets
tinetech.com
2.0 g Pair · M8×6 Bolt + M7 Nut · Double-Sided Hex · Grade 5 Ti-6Al-4V · CNC · 8 Colors · Two-Piece Cranksets
