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San Marco Ass Saver mudguard



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

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 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. 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 worked on the tech team from 2012-2020. 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, and you can now find him over on his own YouTube channel David Arthur - Just Ride Bikes

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thepocpac | 11 years ago

These Ass Savers are great products. We have just decided to co-brand and stock them here. We can offer you a significant saving on the San Marco branded version at £6.99 with free postage and packing.

That's the right price to keep your jerseys white!

issacforce | 11 years ago

What about the swan zefal for about £12 it protects your backside and clips on and off in seconds, used it this winter and works v well

Stumps | 11 years ago

They are very similar to the one i had on my Rockhopper many many years ago. Got it from a local cycling shop and it fitted onto my seat post.

If i remember rightly they were £2.50 then (approx 25yrs ago)so at 12 quid thats not bad.

pj | 11 years ago

"if you have a brooks saddle"

you'll probably also have full mudguards with extended home made mudflap, extensive beard and other weather-proof items.

Valentino | 11 years ago

The Ass Saver SmartAss is nice (I have the direct from Sweden version). Just enough to get the direct spray off your bum and central rear pocket area, which makes a ride turned wet and cold a little less uncomfortably wet and cold, which could save enough energy to get you home before the man with the hammer.

It doesn't fit as well on a Selle SMP Composit as it does on an old Selle Italia Flite, since the Selle SMP rails widen out a lot on their way to the shell but once used on the Flite it fits better on the Composit.
Selle SMP owners don't be afraid to give it a good pinch just ahead of the fold grove.  1

pedalpowerDC | 11 years ago

One can hardly call the Topeak or Crud pieces "a proper mudgard". It will barely do anything more than the Ass Saver, and they are pure Fred looking.

aslongasicycle | 11 years ago

I'd imagine a pro team are after the lightest and most aero solution. Glad that they recognise that freezing water down your back and thighs is a severe performance limiter. Cold wrecks racing cyclists.

Also a massive boon for Ass Savers. Props to them. A huge coup.

Coodsta | 11 years ago

both those & the fendor bender would work well on my cross bike, jsut ot keep a bit of the cack off my backside...

Tommerson | 11 years ago

Still a great product, but.... I prefer the other folding mudguard: The Fendor-Bendor (

It's larger, doesn't fold under the saddle, but gives more serious protection and I easily take it along in my jersey on road bike tours with rain threat. Or in my backpack when commuting.

mad_scot_rider | 11 years ago


Why would I pay £12 for a piece of polyP when for an extra quid I can get a proper guard with a quick release catch so I can easily demount

or if quick release is not important the Crud guard is excellent too

oh - I forgot - it says San Marco on it - pffff

TomvanHalen replied to mad_scot_rider | 11 years ago

Well first off, you pay £9.50 for the normal Ass-Savers one, and secondly, because both of those mudguards are heavy and ugly as sin. It's a lovely bit of design and I wouldn't swap mine for anything (it's actually my second since the first one got stolen along with my whole bike).

Practicality is not everything in life, or we'd all wear £3 t-shirts and never go to restaurants.

Colin Peyresourde replied to mad_scot_rider | 11 years ago
mad_scot_rider wrote:


Why would I pay £12 for a piece of polyP when for an extra quid I can get a proper guard with a quick release catch so I can easily demount

or if quick release is not important the Crud guard is excellent too

oh - I forgot - it says San Marco on it - pffff

I know quite a few people doing long rides who have had them wrecked by old fashioned mud guards getting bent and rubbing on the wheel.

The arse savers looks like the best thing around. If it goes tits up then it probably plops off and you arse gets wet. No faffing trying to straighten it or getting rid of stuff caught between it and the wheel.

Can't argue with a pro.

solentine | 11 years ago

Great product and great around town or down to the station.

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