San Marco Ass Saver mudguard



Keep your bum drier with this cheap plastic mudguard that attaches to the saddle rails

The San Marco Ass Saver is a simple and reasonably effective solution to keeping spray from soaking your bum when riding rain soaked roads. If you can't, or don't want to fit traditional full-length mudguards to your bike, and most racing bikes won't take them, this is better than nothing.

The San Marco branding pumps the price up though. We tested the original Ass Saver Smart Ass mudguard last year and that costs just €7.99 + €3.50 shipping (about £10). San Marco want £12 for their branded version, which smarts a little. Fine if you're a San Marco fan and it matches your saddle perhaps. They're both the same, they're made by a Swedish company who came up with the clever idea a couple of years ago. San Marco have recognised this and arranged to produce a liveried version wearing their logos.

What is is exactly? It's a shaped piece of polypropylene that that goes underneath the saddle and clips to the rails. It's a bit of a fiddle to fit it in place, some saddle/post combinations may require the length to be trimmed, but there are handy dotted guides for cutting. Two plastic hooks provide a very secure fixing to the rails. Since I've been testing it, not once has it shaken loose or needed any attention. It's light at just 15g.

I tried it on several saddles; San Marco's Regale, a Prologo Scratch and a Fizik Arione and each time it went on without any complication. If you have a Brooks saddle, you'll be interested to know they offer a specific version.

Naturally, it's not going to halt 100% of the spray and muck that gets chucked up by the rear wheel, but what it does do is stop a large majority of it. The weather recently has been horrid and has given me plenty of opportunity to test it. And every ride I've finished with a drier bum than riding without it. It's a good first defence against road spray and does go a long way to keeping you a bit drier.

Its simplicity of fitting, sleek design and low weight makes it a practical solution for everyone from racing cyclists who won't want to fit complicated and more costly mudguards to commuters who just want to arrive at the office with a dry bum. What's more, it can be quickly removed and folded in half when you don't need it.

Some of the Lotto-Belisol team, who are sponsored by San Marco, have been spotted using the Ass Saver in many of the rainy early season races, including Milan-San Remo. While it won't be the difference between winning or losing a race for those guys, it will bring a little slice of comfort to them. Marginal gain? Not quite, but what price a dry bum?

The original Ass Saver is available in a wide range of colours, and San Marco offer a section of hues as well.


Keep your bum drier with this cheap plastic mudguard that attaches to the saddle rails.

If you're thinking of buying this product using a cashback deal why not use the Top Cashback page and get some top cashback while helping to support your favourite independent cycling website test report

Make and model: San Marco Ass Saver mudguard

Size tested: Black

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?

An original emergency fender that's there when you need it, gone when you don't. Personalized for us by Ass Savers.

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

An original emergency fender that's there when you need it, gone when you don't.

Personalized for us by Ass Savers.

Rate the product for quality of construction:

It's a strip of shaped plastic but it feels indestructible and built to last.

Rate the product for performance:

It's not going to be as good as full-length mudguards, but it does stop a reasonable degree of rear wheel spray, enough that you're going to have a drier bum with it, rather than without

Rate the product for durability:

So far it's proving tough and very durable

Rate the product for weight, if applicable:

At 15g you're not going to notice it at all.

Rate the product for value:

It's a little more expensive than the original Ass Saver without the San Marco branding, and the Ass Saver company offer a wider choice of colours

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

I was impressed with how much spray it kept off my bum. It's better when there's just a bit of water on the roads and it's not raining heavily, but the heavier and more prolonged the downpour the less effective it becomes

Tell us what you particularly liked about the product

It's simple and works

Tell us what you particularly disliked about the product

There's nothing to dislike really bar that you are paying extra for the San Marco branding a more limited choice of colours, it's a neat design and cleverly executed

Did you enjoy using the product? Yes.

Would you consider buying the product? Yes.

Would you recommend the product to a friend? Yes.

Anything further to say about the product in conclusion?

It works, and it's not outrageously priced but unless you specifically want the San Marco branding I'm not sure why you'd buy one of these in preference to a standard issue Ass Saver.

Overall rating: 7/10

About the tester

Age: 31  Height: 180  Weight: 67

I usually ride:   My best bike is:

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

I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, touring, mtb,


David has worked on the tech team since July 2012. Previously he was editor of and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds.

Latest Comments

  • hirsute 11 min 57 sec ago

    Being unusually hopeful, it could be they are fixing it and are starting with the main traffic which is phone based, then moving on to pcs.

  • Mathemagician 15 min 57 sec ago

    Hmm...actually according to the compatibility charts it won't work:...

  • eburtthebike 32 min 45 sec ago

    Quite, and what if the cyclist has a mirror? I'd love to have had a discussion with one of those officers if they'd stopped me for words of advice.

  • eburtthebike 35 min 30 sec ago

    Unless SGlos council have spent a few million on cycle infrastructure in that area in the past year, then no, it isn't very good, in fact most of...

  • qwerty360 41 min 58 sec ago

    The reversing truck is stuck as the road is busses only from that point. They were doing the safest maneveur (given they can't turn around on Tower...

  • kil0ran 1 hour 1 min ago

    Generally you can always use a tube in a tubeless rim with a tubeless compatible tyre as sometimes you'll have such a catastrophic failure that...

  • RobD 1 hour 2 min ago

    Once you get the basic principles it's quite straightforward, scoop has no cut out, line has the channel, the radius, shallow or flat is how curvy...

  • kil0ran 1 hour 16 min ago

    With that average speed I'd say that any aero benefits will be minimal, unless you ride somewhere very hilly and that's dropping your average. That...

  • leqin 1 hour 44 min ago

    How long do we have to put up with this sort of crap. They are not a fucking watchdog if all they do is cart blanch allow one of the newspapers,...

  • slitemere 2 hours 43 min ago

    Doubles and tripls will never die. The only reason SRAM went for 1x was that they have never been able to make a good quality front mech....