Wolf Tooth Double Bottle Adapter for Your Frame

After buying a full-suspension bike I suddenly found myself with nowhere to put bottles. I normally carry 2 litres of water on the bike, but I simply couldn't fit them into the Supercaliber. So I tried the Wolf Tooth Double Bottle Adapter — with it, I can carry exactly 1,950 ml of water on the bike.

📏 Construction

The whole solution consists of two parts:

• the B-Rad system
• the adapter itself

B-Rad is a rail system the adapter mounts onto. Wolf Tooth has several add-ons for it — for example the option to attach small bags — but I only used bottle cages. I went with the basic two-mount base, which weighs 27 grams. Versions with more mounting points also exist. You can also use an everywhere base, which can be strapped virtually anywhere with zip ties.

The adapter itself mounts onto the B-Rad rail and weighs a further 20 grams. It comes with six TORX-head bolts, which is a welcome touch — far less risk of rounding them off. The bolts that came with the Supercaliber's cage mounts were quite soft.

You then mount one cage on each side. The entire system has a load capacity of 1,700 grams, which is almost spot-on for my setup. I use two Elite Fly Tex bottles at 750 ml each, weighing 58 g apiece, leaving room for two cages of up to 42 grams each.

🚵 In Use

My biggest concern was catching my knees on the bottles when pedalling out of the saddle. From the rider's perspective the bottles look very wide side by side, but in practice it turned out to be a non-issue. It will of course depend on the bike's geometry and the rider's proportions. I only lightly brush the bottles when pedalling out of the saddle, and that's with cranks that are narrower than the Supercaliber spec. When I later fitted the specified DUB Wide cranks, it was even better.

Aesthetically it's not the prettiest setup, and there's likely some aerodynamic penalty too. The bike is more awkward to carry because it's wider and a bottle presses against you.

Grabbing and replacing bottles while riding is very easy, mainly because they stick out at a slight angle.

I also looked at a cheap solution from AliExpress, but honestly I didn't trust it much. It had no specified maximum load rating, and without extra shims it wouldn't even fit on a wider carbon frame. I was worried about stripped bolts, so in this case I preferred to go with a proven brand.

🧑‍⚖️ Summary

If you want to carry more bottles than your frame can accommodate, this is one option worth considering. With a small frame, hauling a larger amount of water will always involve compromises.

The whole system fits well and the bottles never flew off even on rough terrain. Aesthetically it leaves something to be desired, and occasionally you will catch one. For more options on how to carry water on a bike, check out this article. For me it was the choice for the 1000 Miles Adventure. The Wolf Tooth adapter held up throughout — a carbon cage cracked only after 1,500 kilometres. I think the frequent bike-carrying put too much stress on the lightweight construction. Next time I'd probably fit an alloy cage on the exposed side.

Get on Amazon