I bought good size (70lpm) 12V one from local car parts shop. Run it off a gelcel battery as it is easier than use car to power it. Will inflate tyre to 60psi in 30sec, also useful for wheelbarrow tyres and topping up car. The small ones (10lpm) will work but take forever and may not do a tubeless tyre.i got sick of pumps and just bought a cheap air comp off ebay for ten quid