Continental Unisex's 42mm MTB Presta Valve Inner TubeBlack, 27.5 x 1.75 2.5Inch/42 mm

Used this on a 27.5" hardtail with 2.25 tyres—fitted clean, no pinching, and the valve seated tight. Presta valve’s 42mm length is ideal for deeper rims, and it didn’t wobble or leak. I’ve run it across rough trails, gravel, and wet commutes—no flats, no weird bulges, just solid pressure retention.Tube feels tough but flexible—easy to install without fighting it. I always dust with talc before fitting and this one slid in smooth. After a few weeks of mixed riding, still holding air like day one.It’s proper stash-worthy—whether you’re swapping out a flat or building up a fresh wheelset. I keep a spare in the van and one in the kit bag.👍 Pros✅ Fits 27.5" tyres from 1.75 to 2.5 wide✅ 42mm Presta valve—ideal for deeper rims✅ Holds pressure well—no slow leaks✅ Easy to fit—flexible but durable✅ Trusted brand—Continental quality👎 Cons❌ No valve cap included❌ Not tubeless—standard tube setup❌ Slightly heavier than ultralight tubes❌ Needs careful install to avoid pinch flats🧭 Personal ReviewIf you want a reliable inner tube that fits wide MTB tyres and holds up under pressure, this Continental earns its spot. I’ve used it across trail rides and daily commutes—no drama, just clean performance and peace of mind. Proper stash-ready gear for anyone who wants their ride sorted without the faff.

I don't like everything Continental makes, but these inner tubes seem like a solid, good value proposition. I put them on my Scott Genius MTB with Maxxis tyres and so far I can't really fault them. I do mostly trail and hill riding so there's a mixture of road surfaces, and the Continental / Maxxis combination feels good. You might be able to get better tubes, but these look like the right mix of quality and cost

I picked up a couple of these Continental 27.5 x 1.75-2.5” (42mm) Presta Valve Inner Tubes for my 650b gravel/MTB setup and they’ve been solid performers. Continental tubes have a good reputation for a reason — these hold air well over time and feel like quality rubber.What stands out:• Easy to install with the 42mm Presta valve — fits my rims perfectly without issues.• Good thickness and durability; I’ve had fewer flats compared to cheaper tubes I’ve used in the past.• Holds pressure nicely for daily riding and weekend adventures. No slow leaks after a couple of months of regular use.• Versatile sizing works great with my 1.9-2.2” tires (and up to 2.5”).Only minor downside:• A little heavier than ultra-lightweight tubes, but that’s expected for something this tough and reliable. Not a big deal unless you’re racing and obsessing over grams.Overall, these are dependable tubes that do exactly what they should. Great value from a trusted brand. Highly recommend if you want tubes that last and minimize frustrating roadside repairs. Will buy again when needed!

Good

The product is great value for money, I've covered approx 80km on these so far, all off road with no issues whatsoever. Would definitely recommend and order again if needed.

Given that our German cars are fitted as standard with Continental tyres and because it is a well respected brand of German rubber products, we didn't hesitate to buy Continental inner tubes for our mountain bikes. We bought this inner tube as a spare for my son's Trek mountain bike for when either of the ones already fitted to it get a puncture. Needless to say, we're still waiting... Highly recommended.

Thick and Good quality tubes perfect fit on my Mtb.

Purchased this to replace a spare I keep in the garage which has been called in to action following another puncture on my son's mountain bike. I have repaired inner tubes previously with varied success and often it's just easier (and at these prices) good value just to replace the inner tube. As you would expect from a brand like continental it's good quality and well made. My only observation when fitting it was that around the valve is quite firm and I had to use the tyre irons to manipulate the tyre back on to the rim as the firmness of the inner tube at that point (deflated) made space quite tight. Not a problem once I had clipped everything back in place. Overall pleased and will buy again as I am sure I will need to!

Queste camere d'aria confermano in pieno l'affidabilità del marchio e si sono rivelate un acquisto fantastico, soprattutto considerando che sono riuscito a prenderle a soli 6 euro.La gomma è bella spessa e resistente, tiene perfettamente la pressione e la valvola Presta fa il suo dovere senza alcun difetto. Montate sulla mia MTB da 27.5 calzano alla perfezione e offrono tutta la sicurezza necessaria per le uscite sullo sterrato.Un prodotto assolutamente top.

Super

Der Continental MTB Schlauch 27.5 SV 40 überzeugt durch gute Qualität und einfache Montage. Das Presta-Ventil sitzt sauber und der Schlauch hält die Luft zuverlässig über lange Zeit. Ideal als Ersatz- oder Standardschlauch für Trail- und MTB-Einsätze. Robust, leicht und mit einem sehr guten Preis-Leistungs-Verhältnis. Continental liefert hier wie gewohnt eine solide Qualität.

Muchas gracias!

Great for MTB 27.5", highly recommend