2-Pack ROCKBROS Bike Water Bottle Cages Saddle Cage Converter | With Bicycle Bottle Holder Saddle Mount Adapter and Adjustable Angle Aluminum Alloy Lightweight Suitable for Road Bike MTB

Price: $41.99
(as of Jul 28, 2026 20:31:56 UTC – Details)
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Product description

SEAT SPACE UTILIZATION

One cage holds two bottles at the same time, providing you with sufficient hydration for long rides

ADJUSTABLE ANGLE

Our water bottle extension bracket can easily adjusted to any angle to meet your need

ALUMINUM ALLOY MATERIAL

ROCKBROS bike water bottle cage converter is made of aluminum, sturdy and resistant to oxidation

LIGHTWEIGHT AND PORTABLE

This bike water cage adapter weights about 98g (0.2lb) and won’t add burden to your ride

1 SEAT SPACE UTILIZATION

2 ADJUSTABLE ANGLE

3 ALUMINUM ALLOY MATERIAL

4 LIGHTWEIGHT AND PORTABLE

Step 1

Align the retaining clip holes with the mounting holes

Step 2

Put screw into the top hole and tighten

Step 3

Put screw into the hole below and tighten

Step 4

Installation completed

1 Step 1 2 Step 2 3 Step 3 4 Step 4

Universal Fit for All Bike Seats & Bottle Cages Designed to mount under the saddle of road bikes, mountain bikes, and most standard bike seats, this adapter is universally compatible with nearly all water bottle cages. It lets you add 2 extra bottle holders to your bike, making full use of unused pillion space to carry more water for long rides, no matter your bike model or bottle size.
Adjustable Angle for All Water Bottle Sizes Easily adjust the mount to any angle you need, ensuring a secure fit for water bottles of different sizes and models. The flexible design not only keeps your bottles stable during rides but also lets you reach and refill your water effortlessly, even mid-journey.
Complete Installation Hardware Included for Quick Setup All necessary installation hardware and tools are included for fast, tool-free (allen wrench provided) installation in minutes: simply loosen the bolts, mount the adapter to your seat post bracket, adjust your preferred angle, and tighten the bolts. It’s also easy to remove and reposition whenever you need. Warm Tip: Water bottles and bottle cages shown in images are NOT included.
Lightweight, Durable Aluminum Alloy Build Crafted from premium aluminum alloy with CNC anodized processing, this saddle mount weighs only ~98g (0.2lb), adding zero extra burden to your ride. It’s rust-resistant, weather-proof, and built to withstand rain and daily wear, ensuring long-lasting performance for all your cycling adventures.
Versatile Space-Saving Design for Extra Storage Beyond holding 2 water bottle holders for extended hydration on long rides, this adapter is also compatible with bike tail bags, maximizing your under-seat space to carry tools, snacks, and other essential accessories. Loved by cycling enthusiasts for its practicality and reliability, it’s the perfect upgrade for any rider.