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Birzman Razor Clam



Nifty tool perfect for eliminating that pesky brake rub
Can be used on four-piston or two-piston brakes
Easy to use
Doesn’t work with all brake pads

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Birzman Razor Clam disc brake alignment tool does a good job of providing even spacing between brake pads and getting rid of the dreaded brake rub. It's small, functional, and durable, with the handle making it much easier to use than some.

If you're happy to have a go at bike fettling, check out our beginner's guide to bike tools – get all the vital gear for basic bike maintenance.

The Razor Clam is made from stainless steel and 6061 aluminium and is a folding design, with the 'prongs' that slide between the pads and rotor folding back over the handle. The handle is a very useful addition to the design, making it far easier to access the calliper and slide the tool in than simple one-piece designs folded in the middle, such as Birzman's non-Razor Clam. The Razor Clam's folding design also helps to protect the thinner 'prong' material from becoming misshapen.

Another positive is the Razor Clam's length, which means it can be used for aligning both two- and four-piston calliper designs.

Using the tool is very straightforward: loosen the calliper bolts to allow the calliper some movement, open up the Razor Clam and slot it between the brake pads and rotor, then, simply pull the brake lever, tighten up the bolts, and the pads will be spaced evenly. Birzman has a very exciting video showing it in action.

2023 Birzman Razor Clam - 2.jpg

Mostly, I found it worked very well and consistently, with the pads always coming out evenly spaced.

The only issue I ran into was when trying to use the tool with my SRAM Rival brakes; with these, the pads sit so close to the rotor that the tool wouldn't slot in.

> Everything you need to know about disc brakes – read our definitive guide

With so many different calliper designs, I guess there are bound to be some that the tool doesn't work so well with, and it'd be handy if Birzman had a compatibility chart, but it only states that the maximum disc thickness is 2.3mm.

We asked Birzman about this issue, who told us it had tested the Razor Clam on SRAM Rival callipers and rotors, and advised that we would have to 'pinch the front part of the Razor Clam a little so that the sides stay close to the rotor when sliding into the caliper'.

I tried that, and it worked on certain brakes, but I still couldn't get it to fit in my Rival callipers; the pads just sit too close to the rotor.

Value & conclusions

At £8.99, the tool is reasonably priced – a similar offering from Lifeline, the Pro Disc Brake Calliper Alignment Tool, is £11.99 (though currently discounted to £6.99). When testing the Lifeline tool, Liam found it quite difficult to push into the tiny gaps either side of the rotor (though he didn't say which brakes he was testing it on). The Birzman has a far sturdier looking design, making it easier to navigate between the pads.

You can get cheaper alignment tools without a handle – Birzman's non-Razor Clam I mentioned earlier is £7.99 for a pack of three – but they're harder to get the tool in and out, in my experience.

The materials used mean the Razor Clam is robust and hardwearing – after using it many times it has held its shape and works as new. Overall, it's a great addition to your tool kit.


Nifty tool perfect for eliminating that pesky brake rub test report

Make and model: Birzman Razor Clam

Size tested: 82 x 26 mm

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

From Birzman: Disc brake calliper alignment tool that creates an equal space between brake pads and rotor for calliper adjustments.

Features a folding handle which enables better accessiblity when in use, and provides a buffer in storage.

Elongated body accommodates both two- and four-piston callipers.

Tell us some more about the technical aspects of the product?

From Birzman:


Material: Aluminium 6061 / Stainless Steel

Size: 82 x 26 mm

Weight: 15g

Rate the product for quality of construction:

High quality build using good materials.

Rate the product for performance:

Aside from my SRAM Rival brakes, the tool worked well and effectively.

Rate the product for durability:

The tool continues to work just as new after a month of heavy use.

Rate the product for weight (if applicable)

Not noticeable in a pocket, easy to carry.

Rate the product for value:

It is a little cheaper than some similarly designed tools on the market, such as the Lifeline Pro.

Tell us how the product performed overall when used for its designed purpose

It performed well, the only issue being it not fitting in certain SRAM brakes.

Tell us what you particularly liked about the product

I like how small yet useful the tool is. It is something you don't think you need until you try it.

Tell us what you particularly disliked about the product

My only issue was when trying to use it with brakes with very closely spaced pads, but Birzman isn't really to blame there.

How does the price compare to that of similar products in the market, including ones recently tested on

It's cheaper than the similar Lifeline Pro alignment tool (at rrp). The Birzman is £3 less and a better product overall.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

It's great! A very usable and useful tool to have, removing the frustration of brake rub with its simple and sleek design. The only issue is that it isn't compatible with all disc brakes, but that's not really Birzman's fault.

Overall rating: 8/10

About the tester

Age: 21  Height: 171cm  Weight: 72kg

I usually ride: Windover Bostal  My best bike is: Windover Bostal

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Semi pro

I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, touring, mtb, Gravel and ultra-endurance racing

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