Ideal for mountain bikers who already carry a threaded CO₂ inflator and want a faster, more compact backup for higher-volume tyres.
The Muc-Off 25g CO₂ Cartridge - MTB Inflator Refill is the cartridge you grab when a mini pump feels too slow for a proper mountain bike tyre. With 25g of CO₂ inside, it’s sized for MTB use and gives you a fast way to get rolling again after a puncture or tube change.
For riders already using the Muc-Off setup, this refill is a straightforward match for the Muc-Off CO₂ Inflator Kit. Muc-Off rates it to inflate a 29 x 2.4in tyre to up to 30psi from flat, which makes it a practical choice for trail, enduro and general off-road bikes running higher-volume rubber.
If you’re choosing between cartridge sizes, the big advantage here is simple: more gas for larger tyres. That makes this 25g option better suited to mountain bike volumes than smaller road-style cartridges, especially when you want a quick burst of pressure without carrying a pump on every ride.
25g MTB-sized cartridge
The larger 25g fill is aimed at mountain bike tyre volumes, where smaller road cartridges can come up short.
Fast puncture backup
A strong option for quick trailside inflation when you’ve repaired a puncture and just need to get moving again.
Up to 30psi from flat
Rated to bring a 29 x 2.4in MTB tyre up to 30psi from flat with the matching inflator kit.
Works with the Muc-Off CO₂ Inflator Kit
Designed as the refill for Muc-Off’s CO₂ inflator system, so it makes sense as a direct replacement cartridge.
Threaded cartridge format
A practical fit for riders already using threaded CO₂ inflator heads rather than proprietary systems.
Compact ride carry
Easy to stash in a saddle bag, hip pack, tool wrap or jersey pocket as emergency inflation backup.
No hand pumping
Lets you skip the effort of a mini pump when you want tyre pressure back quickly.
General
Performance
Compatibility
Features
Great for
Maybe not for
This is a 25g threaded CO₂ cartridge for MTB use. It’s intended to work with the Muc-Off CO₂ Inflator Kit, and Muc-Off’s inflator kit uses a dual-head nozzle for Presta and Schrader valves. Bigger MTB tyres generally benefit more from 25g cartridges than smaller road-style options.
vs Peaty's Holeshot CO2 Tyre Inflator Kit MTB (25g)
Peaty’s targets the same MTB CO₂ use with a 25g setup, but its inflator head is Presta-only and the system is sold around a more premium kit concept.
vs Lezyne Control Drive CO2
Lezyne’s Control Drive is a well-known alternative built around a compact CNC-machined head with a control valve and support for 16g or 25g threaded cartridges.
vs Specialized Air Tool CO2 Road Mini Pump
Specialized combines CO₂ speed with a backup mini pump, which suits riders who want redundancy rather than a cartridge-only solution.
Check your inflator head before you buy
This is best bought as a refill if you already have a threaded CO₂ inflator. If you’re on the Muc-Off inflator kit, it’s the obvious match.
25g makes more sense for MTB volume
On bigger trail tyres, a 25g cartridge is the safer call than a smaller road cartridge. You get more useful pressure into higher-volume rubber with one hit.
Good emergency option, not an everyday pump replacement
CO₂ is brilliant for speed and compact carry, but it’s still a single-use cartridge. For longer remote rides in Australia, many riders will still pair CO₂ with plugs or a backup pump.
Best used after the puncture is already sorted
This cartridge is about getting pressure back into the tyre fast. It works best when your tube swap, patch or puncture repair is already done and you just want to get riding again.
Muc-Off is a British cycling and powersports brand that began in 1991, founded by Rex and Marilyn Trimnell through X-Lite UK. The business grew from early bike hardware into cleaning and maintenance products, with the brand becoming widely recognised for its distinctive pink bike cleaner.
Today Muc-Off’s range extends well beyond wash products into lubricants, tubeless and puncture-repair equipment, workshop items and rider accessories. The company highlights in-house product development and has built a strong profile across mountain biking, road cycling and motorsport.
