Review: Wolf Tooth B-RAD 4-Slot Mounting Base

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Wolf Tooth B-RAD 4-Slot Mounting Base is literally the backbone of the Wolf Tooth B-RAD system. It uses the existing water bottle brackets on your frame and lets you add or move bottles or frolic in the storage options offered by the B-RAD series. B-RAD stands for Bottle Relocation & Accessory Device if it helps with confusion while it is rad, I suppose. It is a flexible system for organizing bicycle bottles and accessories that can be adapted to your specific needs.

The B-RAD mounting base is available in different sizes ( tested B-RAD 2 last year). The 4-Slot is the largest of the breed with nine threaded holes for the ultimate in flexibility and capacity when cycling, biking, commuting or just exploring on two wheels, according to Wolf Tooth.

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It’s long enough to fit two small bottles online if you will, or just more accessories, and we all know how much some people just love adding things to their bike.

The 4-slot mounting base is a 12-inch metal strip with various openings and holes in it. The slots are there to place bottle holder bolts in, to attach the mounting base to the heads of a frame, and their length allows you to adjust the holder up and down to fit.

For mounting things on the base, these nine threaded holes are designed to be paired with a spacer at standard bottle boss spacing. Want to use an existing bottle holder to add extra storage to your bike? Easy. Do you want to attach extra items to your bike pack fork mounts? No problem.

With a thickness of 6 mm, the bracket is slim enough that it does not affect the location of an existing bottle cage a noticeable amount, nor does it look dull on the bike. Yes, it does matter.

2021 Wolf Tooth B-RAD 4-Slot Mounting Base 3.jpg

In addition to being convenient for hanging extra bottle cages, Wolf Tooth has developed a whole B-RAD series of brackets, bags and straps to add storage to your bike, and if you are ready to buy into the system, it works incredibly well . It’s great for adding storage options to your bike and a blessing if your bike lacks extra brackets or space to carry things.

> Buyer’s Guide: 26 of the best bike bag bags

I found the B-RAD 4-Slot mounting base most useful for piggy-backing something like the Wolf Tooth Medium Strap off the bottom of a bottle cage for a safe way to carry a few bits and bobs on a ride or to mount the Wolf Tooth Pump Bag safe and out of the way for a set under the bottle with down bottles; it was especially helpful. (Full review of both, coming.)

> How to carry things on your bike

The mounting base comes with an extra foam pad and zippers that prevent the metal plate from rattling against your frame and damaging it. With the base attached to the bike at one end and the accessories you fancy bolted to the other end, there is enough flex in the system for the base to clatter against the frame. The pillow and zipper are there to stop this, but it feels a lot like an afterthought and a bit of a bodge.

In terms of price, there is not really much like this around; the closest is 76 Projects Piggy On Bike Storage, which combines a bolt-on mount and belt system similar to the Wolf Tooth Mounting Base and Medium Strap and Accessory Mount, but works cheaper due to its dedicated mount and strap design.

As a way to add potential storage to your bike, the B-RAD mounting base is a great idea, and it offers a far safer way to add things to your bike than the abundance of bags and straps you can tie to your bike these days. However, you will need to buy into the Wolf Tooth system.


The backbone of the Wolf Tooth B-RAD system, and it is a solid storage solution

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Make and model: Wolf Tooth B-RAD 4-Slot mounting base

Tell us what the product is for and who it is aimed at. What do the manufacturers say about it? How does it compare to your own feelings about it?

BOTTLE CLOSURE AND ACCESSORIES UNIT An innovative, flexible system for organizing bottle storage and accessories on bicycles.

Bases are the basis of the Wolf Tooth B-RAD system, and the rest of the B-RAD system is mounted on them. Move bottle cages using existing bottle holders on your bike, and tailor storage to your specific needs. Lightweight, durable, rust-proof materials. B-RAD4’s 4-slot base is the longest base with 9 threaded holes for the ultimate flexibility and capacity when cycling, touring, commuting or just exploring on 2 wheels. It is long enough to mount 2 small bottles inline or more accessories. B-RAD 4 contains the necessary zipper straps, channels for the zipper straps and a foam plate for secure mounting. Compatible with any frame that uses standard 64 mm spacing with bottle holder solder (virtually all modern frames).

As a mounting strip for the Wolf Tooth B-RAD system, it works really well, so you can store tools and things without having to tie it to your frame.

Tell us more about the technical aspects of the product?

Wolf Tooth lists:

Weight: 75g

Material: 6061-T6 aluminum

Length: 307 mm

Thickness: 6 mm

Tools required: T25 Torx

Max load: 1700g

Rate the product for construction quality:


It’s essentially a well-finished piece of metal.

Rate the product for performance:


It works well as a way to add storage to a bike, marked with the potential rattling problem solved by the pillow and zipper.

Rate the product for durability:


It is a metal strip that it and its fasteners are likely to hold.

Weigh the product by weight (if applicable)


Rate the product:


Works more expensive than the similar 76 Projects Piggy, and feels like too little metal with holes in it.

Tell us how the product performed in general when used for the designed purpose

As a way to attach extra bits to your bike, bottles or other B-RAD components, it worked well; the belt and harnesses fixed a foam pad and zipper to stop it rattling was a big disappointment.

Tell us what you particularly liked about the product

A convenient, safe, strap-free way to add storage options to your bike.

Tell us what you especially did not like about the product

Foam cushion and zipper-anti-rattle solution.

How does the price compare to the price of similar products on the market, including those recently tested on

There’s not much like this around, the closest is the 76 Projects Piggy On Bike Storage, which combines a bolt-on mount and belt system similar to Wolf Tooth Mounting Base and Medium Strap and Accessory Mount, but works cheaper because of its dedicated mount and strap design.

Did you enjoy using the product? Yup, a pretty convenient and safe way to add storage options to your bike, especially when combined with other things in the Wolf Tooth B-RAD series.

Are you considering buying the product? I already have many storage solutions for bikes, but that expands the possibilities.

Would you recommend the product to a friend? If they were for long trips that required everything tense on their bikes, then yes.

Use this box to explain your overall score

To get the most out of Wolf Tooth Mounting Base, you really need to buy into the B-RAD system, which may discourage you from just buying a strap-on storage solution, but it works and offers a safe and scratch-free response to bike storage. It’s not cheap, but it’s good quality kit.

Age: 50 Height: 180 cm Weight: 73 kg

I usually drive: It varies with the season. My best bike is: The one I’m on at the time

I have driven for: Over 20 years I’m riding: Most days I would classify myself as: Experienced

I regularly ride the following types of riding: road racing, cyclo cross, general fitness riding, fast / singlespeed, mtb, fun

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