Bike Bottle Holders & Cages | BiKASE, ROCKBROS & Adjustable Mounts
Bike Bottle Holders: Common Questions
What bike bottle holders are available at Urban Cycling Apparel?
This collection carries bike bottle cages and holders from BiKASE (AltGear LLC) and ROCKBROS. BiKASE offers the ABC Cage, which stands for Any Bottle Cage, an adjustable bottle holder that accommodates different bottle sizes and includes a strap adapter for mounting anywhere on the bike frame or fork, not just at standard two-bolt cage mounts. BiKASE also carries the Side Loader Water Bottle Cage, a lightweight composite injection-molded cage weighing just 34 grams that loads from the side rather than the top, designed for compact frame triangles and tight mounting positions. ROCKBROS contributes the 2-in-1 Bike Cup Holder, which mounts to handlebars or seat posts with a 21 to 31.8mm diameter clamp, rotates 90 degrees for horizontal or vertical positioning, and works on road bikes, MTB, e-bikes, and kids' bikes.
What is the BiKASE ABC Cage and why is it useful?
The BiKASE ABC Cage is an adjustable bottle cage designed to hold nearly any water bottle size securely, from standard 21oz cycling bottles to larger 32oz and insulated bottles that do not fit in a traditional fixed-size cage. The included anywhere cage strap adapter lets you mount the cage to frame tubes, fork legs, and other locations where standard bolt-on cage mounts do not exist, which is particularly useful for bikepacking setups, loaded touring bikes, and gravel bikes with non-standard frame designs. It is one of the more versatile single-cage options for riders who use large insulated bottles or need to mount a cage outside the standard bottle boss locations.
What is a side-loading bottle cage and when do I need one?
A side-loading cage allows you to insert and remove the water bottle from the side rather than pulling it straight up out of the top. This is useful on small frame sizes where the frame triangle is compact and there is not enough clearance to pull a bottle upward without hitting the top tube. It is also useful on full-suspension mountain bikes where the rear shock limits vertical access to the down tube cage. The BiKASE Side Loader at 34 grams is one of the lighter side-loading options available and is built from composite material that holds bottles securely even on rough trail surfaces.
What is the ROCKBROS 2-in-1 Bike Cup Holder and how does it mount?
The ROCKBROS 2-in-1 Bike Cup Holder is a handlebar or seat post mounted bottle holder that clamps to any tube from 21 to 31.8mm in diameter using an included spacer and rubber piece. It rotates 90 degrees so you can position the bottle horizontally or vertically depending on where you mount it and your personal preference for bottle access while riding. An Allen wrench is required to adjust the rotation. It is compatible with road bikes, mountain bikes, e-bikes, and kids' bikes, and also works on motorcycles, strollers, and walkers, making it a practical option for riders who want a bottle holder on handlebars without drilling frame mounts.
How do I install a standard bolt-on bike bottle cage?
Most road and gravel bikes have two threaded bosses on the down tube and seat tube specifically for bottle cage mounting. A standard bolt-on cage attaches with two M5 bolts, typically 12 to 16mm long, that thread directly into these bosses. Use a 3mm or 4mm Allen key to tighten the bolts snugly but not over-torqued, which can strip the threads. Cages should be checked periodically for bolt tightness, especially after riding rough roads or trail, as vibration can loosen them over time. For frames without bottle boss mounts, the BiKASE ABC Cage with strap adapter and the ROCKBROS clamp-mount holder both provide bolt-free installation options.
What size water bottle fits a standard bike bottle cage?
Standard bike bottle cages are designed around the 74mm diameter used by most cycling-specific water bottles in 21oz and 24oz sizes. Some cages, particularly adjustable designs like the BiKASE ABC Cage, accommodate a wider range including smaller 16oz bottles and larger 32oz or insulated bottles up to approximately 80mm diameter. If you prefer using a Nalgene, wide-mouth insulated bottle, or a large soft flask, an adjustable cage or an oversized cage specifically designed for larger bottle diameters will hold it more securely than a standard fixed cage. Urban Cycling Apparel ships all bottle holders direct across the U.S. from its Webb City, Missouri fulfillment center.