Aluminum Adapter for Handlebar Bottle Cage Mounting The Tanaka Single Malt adapter opens up handlebar mounting options for a single water bottle cage. Choose the size that matches your handlebar diameter—22.2mm for flat or near-flat bars, 25.4mm for bulged mountain bike bars, or 31.8mm for drop bars. The aluminum body is lightweight and the mount comes complete with mounting nuts and bolts, so you're ready to attach any standard bottle cage right out of the box. Bottles don't require frame eyelets to ride along on your bike with this simple, clean adapter. Keep a bottle within arm's reach on any handlebar setup where adding a cage to the downtube or seat tube isn't practical. One Adapter, Three Sizes 22.2mm ID version mounts to MTB or cruiser bar near the grips 25.4mm ID version mounts to city or MTB handlebar with center bulge 31.8mm ID version mounts to drop bar with center bulge Aluminum construction keeps weight minimal Includes mounting nuts and bolts for cage attachment Bottle cage sold separately