milKit Tubeless Booster

The pressure needed in the booster depends a lot on the tire rim combination and whether or not the tire has already been inflated. With 6 bar / 87 psi in most cases only good tire rim combinations or tires that have already been inflated will work. With 8 bar / 116 psi most tires will work and only in a few extreme cases are the full 11 bar / 160 psi needed.

One of the main advantages of the milKit tubeless booster is the very efficient air flow: unlike other tubeless boosters, the milKit booster doesn’t have a hose and thus no pressure loss – the full air pressure is right by your valve. With so much air shooting into the tire in an instant, even the small booster is efficient enough to inflate any tire (except fat bike tires). Your choice of booster size is therefore a function of what bottle size you want: maybe a compact 0.6L / 17oz or 0.75L / 25oz to fit into your bottle cage or the large 1.0L / 34 oz to bring more water on your ride.

The milKit tubeless booster can be used with any Presta tubeless valve. The milKit valves have the advantage (besides being able to measure and refill your sealant without releasing the air from your tire) of keeping air in the tire without the valve core in the valve stem – which makes inflating easier and more efficient.

Presta valves with external threads that do not reach to the top of the valve stem reduce the efficiency of the milKit booster.

The booster is meant only to pre-inflate your tire so it sits on the rim tightly enough to keep the air in. You then have enough time to insert the sealant through the milKit valve, using the milKit syringe and needle, screw the valve core back and to inflate the tire to full pressure until it fully jumps onto the rim.

If your tire doesn’t hold the air well after pre-inflation with the booster, you might have to first screw the valve core in, inflate the tire to full pressure until it fully jumps onto the rim, then reduce the tire pressure to below 1.5 bar / 22 psi to add the sealant into the tire.

The milKit booster can be used with or without removing the valve core from your valve, although, removing the valve core does lead to a more efficient air flow, and is consequently always recommended.