Aldi CO2 inflator

[Nebulous]

I picked up one of these today, as an impulse buy for £4.99. Does anyone use one? It only came with one gas canister. I understand Aldi sell 5 for £5 but I'll have to wait until they are next in. Do other threaded canisters fit, ie is the thread for them standard?

Cheers

 

[Racing roadkill]

I picked up one of these today, as an impulse buy for £4.99. Does anyone use one? It only came with one gas canister. I understand Aldi sell 5 for £5 but I'll have to wait until they are next in. Do other threaded canisters fit, ie is the thread for them standard?

Cheers

Thread is standard, size varies. If you have a high pressure tyre ( road tube, 100 or so psi) a 16g ( fairly usual ) canister won't be enough, to get full pressure. You can get much bigger canisters, with the same thread, which will do the job in one hit.

 

[Nebulous]

Thank you. Yes I intend to use it for a road bike. I'll look for some bigger canisters.

I'm getting myseIf in a real muddle here. I posted, realised it was in the wrong sub-forum, tried to delete it, and then saw you had replied.

If any mods want to move thread to components and accessories I'd be happy with that.

 

[rb58]

I've always used threaded 16gm on 700x25s and never felt they under inflated. I bought the cartridges in bulk off eBay a couple of years ago. Paint ball gun cartridges I think.

 

[fossyant]

16g is generally enough to get road tyres and MTB tyres upto a reasonable pressure. More volume in MTB, but enough to 30 PSI

 

[Bollo]

Nope, never had problems getting up to proper pressures with 16g cartridges on 700x23 or 700x25 road tyres either, and I'm a bit of a princess when it comes to under-inflation.

 

[Bollo]

Which as a physicist got me thinking....

Making some crude assumptions about the cross-sectional area of the inflated tyre and also assuming CO2 is an ideal gas, a back-of-the envelope calculation says that 16g would be enough to hit about 178psi at 20C! (If my maths is right of course - I'll show working out to check if people disagree)

In practice you wouldn't get too near that because of the inevitable leakage when getting the inflator valve on and off, never mind some of the physical assumptions.

I can think of a few times where I've squeezed out one and a half tyres from a single canister, or managed two tyres with a bit of pre-inflation using a mini pump.

 

[fossyant]

In reality, a 20c tyre isn't much smaller than a 23c, believe you me, I've run 18c and 20c in the past.