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Joe's No Flats Road Racing Sealant



Road-specific sealant that works really well at high pressures, but the tiny bottles work out expensive
Works well at high pressures
CO2 friendly
Easy to use
Small bottles not very economical (or eco...)

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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Joe's No Flats Road Racing Sealant is designed especially for the high pressures found in road tyres, though its abilities there come at the expense of just how big a hole it can plug. With limits at 130psi and holes up to 3mm wide, it's very capable – it covers most normal road punctures, and does it well.

One downside of nicking sealant from our friends at is that it can't always cope with the pressures we run. Whereas mountain bikers are in the region of 20psi, it's still commonplace to find 90psi or even higher on the road. I've experienced first-hand sealant failing to plug fairly minor holes at road pressures...

Joe's No Flats says Road Racing Sealant works up to 130psi, and is suitable for use in tubeless-ready tyres, tubular tyres and tubes. Quick note: our test bottle says 'Road Leader,' but since we got ours it's been renamed. It's all the same stuff, though.

> Buy this online here

The trade-off for it being able to coagulate at such pressures is the size of holes it can plug. But even though 3mm is relatively small (typically you'll see limits around 6mm), in my experience it's more than enough for 99% of road punctures; they're usually caused by thorns and flint, instead of the gnarlier things you find off-road.

Over six weeks of testing, this stuff successfully plugged multiple holes that would have otherwise required a tube change, so personally I'm more than happy to take the compromise.

I'm also impressed with how quickly it seals. Although not quite instantaneous, as per Joe's claim, more often than not I could continue without having to stop to add air. If I noticed a puncture I would pull over and check – in general, I found my 75psi race tyres would be down to about 60-65psi, which I think is pretty impressive considering how fast the air blasts out.

> Tubeless tyres: 14 hidden pitfalls you should try to avoid

I could then happily pump my tyres up to 90psi (the highest I dare with my rims) with no issues. It also sealed a 100psi tyre on a different rim after I attacked it with a drawing pin.


Application is as easy as it gets. The spout is good for squirting between a rim and unseated sidewall, or straight in through a removed valve core. As one bottle (60ml) is good for one tyre, there's no measuring required or spout clogging to deal with.

Compared to other sealants' instructions, 60ml does seem on the high side, but in my experience it's about what is actually necessary. For example, the Juice Lubes Tyre Juice bottle recommends 30-50ml per road tyre, but as far as I'm concerned you really need all 50ml.

After only six weeks I can't comment on its longterm ability or how long it takes to dry up, but I haven't needed to top up at all, which is promising – especially given the uncharacteristically mild weather. Joe's recommend replacing the fluid every 3-6 months, depending on conditions.

Unlike some sealants this one is compatible with CO2 canisters, too.


Road Racing Sealant is a little pricey. At £5 per 60ml bottle it's more expensive than Panaracer SealSmart (£7.99 for 120ml) or Hutchinson Protect'Air Max (£6.95 for 120ml), though it is cheaper than Schwalbe Doc Blue at £7.99 for 60ml.


Joe's No Flats Road Racing Sealant works well at high pressures, or at least as high as 100psi – I couldn't go any higher, but suspect few riders today will want to either. It proves consistently effective at my more typical pressures of 75psi, too, which is not always the case with other sealants.

For road use the 3mm hole limit is no particular drawback, although arguably the price is – at the time of writing there was no option to buy in larger quantities, and doing it one tyre at a time is not the most economical way of keeping your wheels turning.


Road-specific sealant that works really well at high pressures, but the tiny bottles work out expensive test report

Make and model: Joe's No Flats Road Racing Sealant

Size tested: 60ml

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?

Joe's No Flats says it's: "Specifically engineered to seal punctures at high air pressures of road wheels."

I found it worked well at high pressures (>60psi).

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

From Joe's No Flats:

Designed to protect high pressure tires up to 130 psi.

For tubeless ready tires, tubular tires and tubes.

Instantly seals up to 3 mm punctures in the tread.

CO2 compatible.

Contains micro-sealing particles.

60ml bottle

Rate the product for quality of construction:
Rate the product for performance:

I've been impressed with the high-pressure sealing ability.

Rate the product for durability:

Doesn't last as long as some sealants with replenishment required every 3-6 months (depending on conditions).

Rate the product for weight (if applicable)

The dose of 60ml per tyre is about average, and so is the weight.

Rate the product for value:

It's expensive; hopefully Joe's will start selling it in larger bottles, as they do with some of their other sealants.

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

Very well. It seals thorn and flint holes with no issues, works at the highest pressures I could muster (100psi) and, while it only works on holes up to 3mm, for road use anything larger than 3mm and I'd be expecting to 'boot' and tube the tyre anyway.

Tell us what you particularly liked about the product

No measuring required, and it's straight in through the coreless valve.

Tell us what you particularly disliked about the product

The cost.

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

It's expensive, although not the most expensive. At one bottle per wheel it's never going to be the most economical.

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

This works well at high pressures, and the 3mm hole limit is more than enough for 99% of road punctures. Although the small bottle is convenient and easy to use, it's also an expensive way to buy sealant.

Overall rating: 8/10

About the tester

Age: 22  Height: 6ft  Weight: 74kg

I usually ride: Specialized venge pro 2019  My best bike is:

I've been riding for: 5-10 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, club rides, sportives, general fitness riding, mtb,

Jamie has been riding bikes since a tender age but really caught the bug for racing and reviewing whilst studying towards a master's in Mechanical engineering at Swansea University. Having graduated, he decided he really quite liked working with bikes and is now a full-time addition to the team. When not writing about tech news or working on the Youtube channel, you can still find him racing local crits trying to cling on to his cat 2 licence...and missing every break going...

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