How Much Do Shimano Caliper Hose Clamp Bolts Weigh?

The bolt clamping your brake hose into each Shimano caliper weighs 5.0g per pair — identical steel hardware across R9270, R8170, and R7170. Titanium drops it to 2.0g. Three steps, five minutes, no re-bleed needed.

Shimano ships the same steel caliper hose bolt on 105 and Dura-Ace. 3.0g saved per bolt pair — front and rear combined saves 6.0g with zero hydraulic-system work.

Step 1: Locate It

Top of either brake caliper, where the hose enters the banjo fitting. A single bolt — typically 3 or 4mm hex head — pinches the olive and barb against the caliper body to form the mineral oil seal. If you've ever adjusted hose angle, you've already turned this bolt.

Step 2: Weigh and Swap

1、Remove the stock steel bolt: 5.0g uniform across all three 12-speed groupsets.

2、Replace with Grade 5 Ti-6Al-4V: 2.0g. Swap one caliper at a time.

3、No need to disconnect the hose — hydraulic line stays sealed, no air entry.

4、Light grease on threads (titanium into aluminum caliper body), torque to Shimano spec. Same clamp force.

Step 3: Check and File It

Squeeze the lever firmly several times. No mineral oil weeping around the banjo? Done. These bolts (6.0g saved front+rear) combine with the bleed port screws swapped earlier (2.8g) for 8.8g off the calipers without opening a single hydraulic seal. Stack in the caliper mount bolts and centerlock rings for a completely titanium-touched brake system.