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review

Momum Gum Tubeless Tyre Sealant

8
£11.99

VERDICT:

8
10
Fast-sealing product that copes with the majority of punctures on both road and gravel tyres
Works quickly
Copes with higher road pressures
Cheaper alternatives out there
Weight: 
234g

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The Momum Gum Tubeless Tyre Sealant works quickly at sealing punctures whether they're in high-pressure road tires or big, softer large volume ones. It plugs holes from small thorn pricks up to larger slices, and looks to be long lasting too.

Momum's Gum sealant uses fast-reacting microfibres, apparently, and I found it to work well both on my road bike and gravel bike setups. Some sealants don't cope that well with road pressures – blocking holes at, say, 50psi, but blowing out once you get above that. I had no such issues with Gum, and found the seal remained in place up to around 80psi.

On smaller holes created by bits of glass, thorns and the like it reacts quickly and with very little pressure loss, often not requiring me to even stop the bike to top the air up.

> Buy now: Momum Gum Tubeless Tyre Sealant from Momum for £11.99

I didn't pick up anything bigger than that during the test, though, so playing with a sharp knife in the garden I created differing sized cuts in a gravel tyre. Between 2mm and 4mm long I still found Gum sealed relatively quickly, and didn't drop a huge amount of pressure.

With cuts bigger than that it took a little longer, but it could still cope with around 5-6mm without too much hassle.

> Buyer's guide to tubeless tyres – find out all about new technology rubber

Gum is available in three sizes: this 200ml bottle (which comes with a valve key), or in 1L and 5L bottles. The 200ml version is enough to do two gravel tyres (80-100ml per tyre) and around three road tyres at 50-70ml each.

I've had it in various tyres for about five weeks now, which is not a huge amount of time, but it has shown no sign of drying out at all. The temperatures haven't exactly been that high yet though.

Value

Priced at £11.99 (£60/litre), this 200ml bottle works out a fair bit cheaper than something like Muc-Off No Puncture Hassle sealant. At £9.99 for a 140ml pouch, that's £71/litre.

CST's Tubeless Tyre Sealant worked well even if it didn't quite meet the manufacturer's claims of big-hole sealing, but that's cheaper at £10 for 250ml, or £40/litre.

Overall

This sealant is decently priced, and I was impressed with its performance on both the trail and the road.

Verdict

Fast-sealing product that copes with the majority of punctures on both road and gravel tyres

road.cc test report

Make and model: Momum Gum Tubeless Tyre Sealant

Size tested: 200ml

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?

Momum says, "GUM is our way of understanding what a sealant should be. It stands out for its high sealing capacity and active life inside tyres. Another of its most notable features is its ability to seal punctures and small tears quickly thanks to the use of fast-reacting microfibres. GUM sealant is backed by the experience of more than 15 years manufacturing a product as technical as this."

It works well on punctures and small tears that aren't big enough to require a plug. Longevity looks good too.

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

Quick sealing thanks to its fast-reacting microfibres.

Long active durability inside the tire.

Suitable for road and MTB.

Compatible for both tubes and tubeless tires with removable valve core.

Available in 3 sizes (200ml, 1 liter and 5 liters).

The 200ml format includes a valve core removal tool.

Directions for use:

Shake the bottle well before application.

Direct inside the bottom of the tyre or directly through the valve positiomed at the bottom with the core removed.

Road: 50-70ml per tyre, Gravel: 80-100ml per tyre, MTB: 130-150ml per tyre. Less sealant can be used but this does impact longevity.

Set tyre onto rim or reinstall valve core

Pump up tyre to desired pressure and spin to spread the sealant

Get out and ride! (No, serioulsy! This will help ensure the bead is firmly locked in place and the sealant has created a secure seal)

Rate the product for quality of construction:
 
8/10
Rate the product for performance:
 
8/10
Rate the product for durability:
 
8/10
Rate the product for value:
 
5/10

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

Does a great job at sealing holes and small tears quickly.

Tell us what you particularly liked about the product

Works quickly, even on high pressure tyres.

Tell us what you particularly disliked about the product

Some cheaper alternatives perform just as well.

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

It kind of soaks up the middle ground, being cheaper than something like the Muc-Off No Puncture Hassle, but more expensive than the CST sealant.

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

Dependable sealant that works well with both high and low pressure setups against the usual puncture-causing culprits.

Overall rating: 8/10

About the tester

Age: 42  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: B'Twin Ultra CF draped in the latest bling test components

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

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed,

As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for road.cc, off-road.cc and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

Add new comment

21 comments

Avatar
wtjs | 1 year ago
0 likes

I enjoy reading these sealant topics just for the schadenfreude. However, inexplicable misfortunes also occur with tubes. I arrived with my bike on the bus at Skipton to meet my daughter. The front tyre was flat although it was fine when I got on the bus- the tube proved to have deteriorated at a seam which I haven't experienced before.

Avatar
PiersRiley0121 | 1 year ago
0 likes

Glad you liked the sealant Stu and thanks for your review of the product! Hopefully it keeps you out of puncture trouble on the road and trails over the next few months!

Avatar
mike the bike | 1 year ago
0 likes

I abandoned my tubeless experiment after 8 disappointing months and have been back on tubes for over a year.  Although I haven't had a single flat in that time I do miss the comfort of tubeless tyres and I've been thinking about trying again.  

The reason for giving up the first time was the miserable performance of Stan's sealant which didn't deal with either tiny or large holes.  Was I just unlucky, perhaps it was a bad batch of gloop?  Is this one any better?  Should I risk it again?

Avatar
ktache replied to mike the bike | 1 year ago
0 likes

I noticed this review mentions higher pressures.

Avatar
Hirsute replied to mike the bike | 1 year ago
0 likes

Stan's race comes up as one of the best. LBS reckon muc off is best.

I am thinking of swapping to those puncture proof inner tubes mentioned on here (https://road.cc/content/review/tubolito-x-tubo-citytour-tube-291089) but lower pressures on crappy roads is more comfy, so not sure what is best.

 

Avatar
Chris Hayes replied to Hirsute | 1 year ago
0 likes

After much experimentation I settled on MucOff....seems to seal better....possibly due to a higher viscosity, and I like the colour. 

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wycombewheeler replied to Hirsute | 1 year ago
0 likes

I started with Stans regular, and after some non sealing issues topped up with Muc Off, no more problems.

Then on a new tyre I had issues with muc off and topped it up with stans regular - no more issues.

I don't know if this was a coincidence or if a mixture is actually better. Although I hear that stans race is better, so much so tht it should not be applied through the valve core, if you expect to use the valve in the future.

I'm running 30mm tyres at 60psi, don't know if this counts as high pressure. I've never had the nerve to go tubeless on my aero bike with 25mm tyres, which I run at 90psi

 

Avatar
HaveLegsWillRide replied to Hirsute | 1 year ago
0 likes

I used Stans Race for years with no issues, both road & mtb. Went for Muc Off last year as I like the tube on the bottle & never had so many issues. It smells nice but will be going back to Stans when it's gone!

Avatar
PiersRiley0121 replied to mike the bike | 1 year ago
0 likes

I'm definitely familiar with hearing others experience similar to you, and then in contrast those who love it (like me!) and have had a clean run for years. Having tried most of the 'good' sealants out there, what we like about Momum's GUM sealant is that its not too thin or not too thick, which means it plugs the small holes up quickly but can also manage the larger ones. Other sealants tend to favour one or the other and struggle to peform well across the board. Be brave, have faith and give it another shot. I'm sure once you're setup with the right amount of sealant you'll change your perspective!

Avatar
Hirsute replied to PiersRiley0121 | 1 year ago
0 likes

Are you a representative of Momum?

Avatar
mdavidford replied to Hirsute | 1 year ago
3 likes

oneridecycling.co.uk

"Newly formed in the Autumn of 2021, founder and owner Piers Riley set out to create a supply link in the UK for the innovative Spanish brand Momum after working with their founder and testing their range of products over a 6 month period."

Avatar
PiersRiley0121 replied to Hirsute | 1 year ago
0 likes

Yes, I am. Having worked in and around the bike industry for 10+ years, I came across Momum's MIC Wax and was so impressed I decided to setup a business selling it, along with their other fantastic products in the range, in the UK. You can check our website out here: www.oneridecycling.co.uk

Avatar
Hirsute replied to PiersRiley0121 | 1 year ago
2 likes

What are your views on remington shavers ?

Avatar
andystow replied to mike the bike | 1 year ago
0 likes

mike the bike wrote:

The reason for giving up the first time was the miserable performance of Stan's sealant which didn't deal with either tiny or large holes.  Was I just unlucky, perhaps it was a bad batch of gloop?  Is this one any better?  Should I risk it again?

My experiment has gone better than yours, using Stan's in 48 mm René Herse tyres at typically 25-35 PSI, I have had one puncture that required a plug (a sidewall cut whilst riding through a cornfield) in 8800 miles. That's an order of magnitude better than my results with tubes.

However, I do plan on trying other sealants, as I will seem to go a week with having to put in air in daily, then weeks when it holds air. Sometimes I come out of work to one of the tyres being completely flat, but at least I can just pump it up and ride home, so it delays me one minute instead of five or more.

I tried Orange Seal once, but once I found out that was where the annoying aluminium shavings were coming from, I gave up on that one. Yes, they use metal shavings in the sealant!

Avatar
ktache replied to andystow | 1 year ago
1 like

Orange Endurance seal user here, but I run at between 10-15psi, I had always thought they were silvery plastic.

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ktache replied to ktache | 1 year ago
0 likes

Mylar maybe, like crisp packets?

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andystow replied to ktache | 1 year ago
1 like

ktache wrote:

Orange Endurance seal user here, but I run at between 10-15psi, I had always thought they were silvery plastic.

I could be wrong, but once I dried them off they looked and felt like aluminium shavings to me.

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ktache replied to andystow | 1 year ago
0 likes

Fair do's.

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jacknorell replied to andystow | 1 year ago
0 likes

Better than shedding micro plastics everywhere

Avatar
Secret_squirrel replied to mike the bike | 1 year ago
0 likes

I had no luck with Stan's just didnt have the volume of "bits" to block at road pressures.  Since others swear by it I wonder if their QC is a bit poor.

Schwable was ok - Orange better - havent looked back.

Avatar
shufflingb replied to mike the bike | 1 year ago
1 like

Difficult to say because it totally depends on the combination of the pressure needed to support load, how thin and flexible the tyre casing is, and chosen sealant gloop.

Been using since 2015. Thin casings with higher, north of 40psi, pressures with standard, squirt it through the valve core, type sealants will tend to blow out most of the sealant before it has a chance to seal anything beyond a tiny pin prick hole.

Which is why the baggy brigade with their chunky tyres and low pressures swear by tubeless. And by contrast, many roadies swear at it.

Slightly higher pressures, say up to 50psi, and thinner casings can work pretty well if a sealant with decent sized bits in it is used. Say something like Stans Race (very messy) or (current fave) Effetto Mariposa with the Vitamina CL additive (or possibly this Momum Gum stuff being reviewed here).

fwiw, both my gravel bikes are setup with inserts and tubeless. Their sizes mean I can currently run 20psi and 45psi in the rears. I still carry a spare tube and pump but it works really well. On the other hand, none of the road bikes are tubeless, as they'd need least 90psi for my 100kg and it's not worth the cleaning and hassle when it doesn't work.

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