Since we've been talking about bar bags recently a few folks have asked questions about attaching them to the bike.
Traditionally handlebar bags were, in fact, attached to handlebars. Hardly anyone does this today. The bag is supported by a small rack. On some old rando bikes I've seen the bag sitting directly on the front fender, but the fender needs an extra stay in front if its to support the bag.
The elastic on the top flap was often drawn over the stem, making it easier to open the bag. It's still the way I often close my bag.
Rather than attaching the bag to the bars, it's far more convenient to attach it via a quick release mechanism called a decaleur. This way the bag is easy to lift off and take with you when you've parked the bike. Notice how the leather patch on the back of the bag slips over the rack's backstop; that's what really holds the bag in place. A set-up like this is fine for most road riding, but bumpy roads may require a strap underneath to further stabilize the bag.
Note that the decaleur bar may be mounted high on smaller bags or lower as on the
Grand Cru bag above.
You add a
separate decaleur that mounts to the fork. We make these in sizes to fit 1' and 1-1/8" forks. The tangs can be bent for precise fit, but they may not work on very large and very small frames.
I prefer to use a rack with an integrated decaleur. This allows the bag to work on any size frame. We make a version of both the
Pass Hunter and
Rando rack with a decaleur, and the front
Campeur rack includes an integrated decaleur.
By the way, we have
extra decaleur bars so you can use more that one bag on your bike. I have a big bag, a small bag, and a basket that work with the decaleurs on all my bikes.
If using a rack with a backstop, but no decaleur, slip the back patch over the back stop and...
...secure the bag to the rack with a strap.
If you want to use your bag on a rack without a narrow backstop, use two straps underneath. You might also try Igor's trick of securing it to the handlebar drops to keep the bag extra-stable on extra rough roads.
That's it. Do you have any bag mounting tips to share in the comments?