Review: Peaty’s Tubeless Sealant.

There is no doubt that the number of riders going tubeless is on the increase, so naturally, so are the number of manufacturers wishing to capitalise on the upward trend.

Previously, anyone wishing to say goodbye to punctures had three main options for fluid: Joe’s, Stan’s or some weird home-brew concoction made in their garage, combined with ghetto setups, often with varied results.

Thankfully, the choice is now ever expanding and the latest offering of fluid (ooer) comes from former World Champion Downhill Mountain Bike Rider, Steve Peat.

Steve and his team have very kindly sent us a 1l “workshop” bottle of their newly launched “Peaty’s Tubeless Sealant” to test. So, we wasted no time in giving it a go.

In order to give the review the credibility it so rightly deserves, I enlisted the help of Joe France; best mate, tubleless aficionado and, more importantly, owner of a compressor! It just so happened that he also had a pair of Schwalbe 26×4.0 Jumbo Jim tyres, waiting to go on his wife’s Canyon Dude.

The first thing we noticed about the fluid was the colour, and not just the glitter through the bottle! Like magic, as soon as the fluid mixed with the air, it took on a completely different look as it shimmered blue in the late afternoon sun (on the particularly large “ding” we noticed on the rims!). It was mesmerizing.

It’s not hard to see why Peaty’s tongue in cheek marketing campaign has involved many references to rainbows and unicorns.

We also noticed the smell. Well, the lack of it. A definite plus point for us was the lack of “ammonia” stench that we associate with our usual brand. Apparently, it didn’t taste too bad either. Not that we in any way suggest you follow Joe’s lead and put the sealant anywhere near your lips. But, what’s done is done.

Then there’s the viscosity. Peaty’s Tubeless Sealant is gloopy, surprisingly gloopy. But more on this later.

With the visual tests complete, it was on to the test proper. We had already decided that the test would be in two parts; both short and long term.

Ultimately, we wanted to see how well the fluid sealed punctures and naturally, the best way to replicate this was to puncture the tyre. With vigour.

Now here at, we don’t have a bottomless pit of cash to go spunking on brand new tyres to test to destruction. So the eagle-eyed amongst you will notice that the tyres on the first test are a little worn, but as you’ll see, they do the job perfectly.

By their own admissions, the team behind Peaty’s Tubeless Sealant haven’t yet tested its suitability for fat bike tyres, so we were in uncharted territory. Something we are familiar with, as none of the other established brands give guidance for us either.

In our existing set ups, we’ve arrived at 120ml as being the “right” amount for fatbike tyres, and a quick internet search tells us that the general consensus is anywhere between 120ml and 160ml.

So, we went with what we know and decided on 120ml as our starting point.

Having seated the tyres and removed the valve cores, we knew that it would be impossible to decant  the 1l workshop bottle straight into the valve. In fairness, this is no different to existing manufacturers, normally forcing us to decant into the smaller 60ml bottles they offer for sale. We know that Peaty’s Tubeless Sealant is sold in 120ml “Trail Packs” so in real life, we would have measured out the fluid into one of those if we had one. Maybe this is a point of note for all manufacturers; buying in bulk is what we all do but we then need a way of getting the stuff in the tyres. Maybe a free empty small bottle with every big bottle sold? It would certainly help those trying tubeless for the very first time. And we know you can just unseat the tyre and pour it straight in, but that’s just madness! Once the tyre is seated “dry” there’s no way it’s coming off again, just to apply the fluid.

With necessity being the mother of all invention, we utilised a length of 5mm tubing we had lying around and began squeezing in earnest. We liked the clarity with which the fluid levels were marked on the outside of the bottle, meaning our measuring was accurate and straightforward.

Having replaced the valve core, we wazzed the tyres up to a steady 10psi and gave them the usual spin / slosh around to distribute the fluid.

Here we noticed the viscosity caused a bit of an issue, as we couldn’t hear a thing. We knew we’d put 120ml in there but they sounded empty.

A quick test (off camera) failed to give us a successful result, with a small hole totally refusing to seal. After another couple of revolutions, to direct the fluid to the right spot, we came to the conclusion that 120ml obviously wasn’t enough.

We increased the fluid to 240ml and tried again, and again the hole failed to seal. Though this time, we could definitely hear the fluid sloshing around.

So, it was up to 300ml for one final attempt. We knew that eventually the hole would seal but did consider the added weight caused by the increase in fluid. As we don’t know it’s density, we couldn’t work out it’s actual weight but knew if it was water, we’d be looking at least 300g and almost surpassing the weight of a tube.

Did it work?

Click here to watch the test

(What you didn’t see in the test video was the fact that it completely sealed a tear in the sidewall, which we were really amazed by)

After the test, we ditched the knackered old tyre and put on the new ones.

When we removed the tyre, we were surprised to see that rather than finding all the fluid pooled at the bottom of the tyre, the Peaty’s Tubeless Sealant had effectively coated the whole inside of the tyre and rim.

We salvaged the spare fluid by squeegeeing it out, and set about setting up the new tyres. We put 300ml of Peaty’s in the front tyre and a Peaty’s / Stans  (90ml / 90ml) concoction in the rear. As we said at the beginning, we always saw there being two parts to this test and we’ll report back on how well this works as we get out and ride the bike in real world conditions.


There is no doubt that Peaty’s Tubeless Sealant works. And it works really well. It sealed all the drilled holes in an instant and did a grand job of sealing a torn sidewall. But is it any good for fatbikes?

We are left in a bit of a quandary with this one.

It definitely comes down to the viscosity. We liked the fact that the thickness meant that upon puncture, the fluid didn’t come spewing out like it can with other brands. But that, of course, can also be attributed to the low pressures we run in our tyres. And we think there lies the problem.

We saw that in volumes under 300ml Peaty’s Tubeless Sealant will probably only coat the tyre and rim of fatbike wheels, leaving none left over to be forced by the limited air pressure to the site of a puncture. Only when you up the quantity is there enough to do both.

Personally, we think 300ml is too much fluid, especially when you consider that a 1l workshop bottle will only cover you for 3 tyres. It’s worth noting that our test tyres were 26×4.0 and we think you’d need more fluid if you went up to the 26×4.8’s we normally run.

But, cost wise, we don’t know how long it lasts. Stan’s guidance is to replace every 6 months, which we’ve found to be the absolute maximum, preferring to check and top up every 4 to 5 months. Peaty’s doesn’t offer any guidance on the bottle but if it lasts longer, then it might just be as good value, if you aren’t fussed by the increase in fluid and therefore weight.

We also wondered if a drop in temperature would cause the fluid to thicken, therefore meaning we would require increased volumes in winter months. Only time will tell with this one, and in the words of Ned Stark “Winter is Coming”

To sum up, we can’t say that the test failed as (a) the fluid definitely did its job and (b) we appreciate that it hasn’t been designed with fat bikes in mind so can’t really criticise on that point. But, we probably can say that it’s design isn’t that suitable for use with tyres of 4.0” upwards, which we found a real shame.

What we liked:
The speed of seal
The fact it sealed a torn sidewall
The anti-spurt viscosity
The glitter and mesmerizing colour
The packaging and bottle measurements
The smell
The taste!

What we didn’t like:
The amount needed for fatbike tyres

But, whilst it might not be that suitable for fatbikes, we wouldn’t write it off completely. We’ll definitely be using it in our other bikes (Gravel & MTB) but we obviously won’t be writing about that here.

We will, of course, report back and update you on the test bike, as we see what happens with the front / rear combination of fluids and volumes.

As always, we welcome your thoughts. Please get in touch if you’ve had a different result to ours. We’ll also be contacting Steve Peat and his team for their thoughts on our results, and we will let you know what they say.

If you want to try Peaty’s Tubeless Sealant for yourself, then a full list of Europe wide stockists can be found by clicking here


Author: Damo

Bike rider. Ale drinker. Beard wearer.

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1 Comment

  1. Interesting review. We to did a review.

    We bought the full stand for the shop and used the workshop sized bottle. We like you looked at the quantity guide and emediatly reolised you have to use twice as much (Twice the cost) compared with the compeition.

    We did this. We had to seat 2 pairs of tyres. After a lot of moaning and growning we gave up on all oft hem, they just would not seal.

    We put Stans in and…. bang all sorted with half the fluid.

    I rang the distributor, who then pug me through to the guy behind Peaty’s. I told him about the issues, he informed me i probably had 2 different recipes of fluid on my stand as they were on their 36th.

    I was very surprised to hear this and asked which recipes i had, he didn’t seem to know. Mad!

    He explained the products were being aproved by lots of top riders, but everyone he mentioned used it rode downhill and put a lot more fluid in than normal.

    With the failier of the sealant to work on our 4 tyres, and the lack of any idea of what we actually had bought and are expected to sell to the public, we returned the stand and will not recomend the products to anyone.

    A sealant needs to be able to move quickly in a tyre to work effectively. We used gallons off luid as we sell lots of fatbikes wheels with tyres so feel sort of have a good idea on what works.

    We’ve tried Stans, Orange Seal, Joes Eco, and Peaty’s.
    In our real world experience, right now the best is Stans, followed by Oeange Seal, both Joes and Peaty’s failed to work for us.

    Tob ring things up to date, we are waiting for the new sealant from Finishline as they say it will last the life of the tyre. We’ll see soon as we get some.

    Graham – slam69.

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