Topeak Airbooster Extreme

While my mini-pump advertised the capacity for 110psi, my tiny cyclist arms refuse to get there. Using the Topeak Airbooster Extreme is super-easy and gives rock-hard tyres when needed most. A brilliant triathlon or time trial package.

As mentioned above, my pumping ability is awful. Larger teammates always have to help me out. So when I attached the canister to the valve and the tyre just inflated, I could instantly see the appeal.

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The ease of inflation is helped in no small part by the excellent adapter that Topeak supplies with the kit. Firstly, the canister is screwed into the adapter via the perfectly CNC machined threaded end. Then you press the other end to your valve. How could it be easier?

The adapter features a nifty pressure regulator that releases more C02 when you apply more force against the valve. I found this incredibly useful to get the tyre seated initially so that I could check for any pinch in the tube. Once seated, I could then inflate the tyre up past 100psi with the C02 left. That's quite reassuring as it means you can top up the tyre should any further deflation occur.

The parts can then clip back into their mounts or be stored in a jersey pocket for later. Once the canister has run out, you'll need a replacement. Topeak's instruction manual states that any 16g canister can be used, which should keep costs down.

As C02 is a gas, it's worth remembering your GCSE science lessons. It will escape much faster than normal air, especially under such pressure. As I run latex inner tubes, this occurred overnight, so it's worth bearing in mind that you'll need to find a track pump before your next ride. However, out on the road after three hours, there was no tangible loss of pressure.

One issue I found was the lack of insulation around the canister. Both the canister and adapter get incredibly cold as soon as pressure is released. This is fine if you can wrap the canister with a mitt but that's not always possible, especially in a triathlon. I've also been testing a Bontrager C02 kit which includes a rubber sleeve for the canister, so it's a little annoying that Topeak has missed such a simple and quick fix.

Out on the bike, while waiting for a puncture, the kit sits nicely under the saddle. A simple yet sturdy mounting kit comes supplied or you can just pop the parts in your saddle bag or pockets. The 164g feels heavy in your hand but has no impact once on the bike. The mounting options are on the saddle rails or on the top tube. Both were easy to install and then access, but my preferred option was under the saddle. With the kit out of sight I forgot it was there. I did, however, end up putting the canister and adapter in my saddle bag. For general riding and training, I was happier with it protected against the rain.

> Read our guide to the best pumps and CO2 inflators

Overall, this kit has not only impressed me but also changed my views on the use of C02. I'd look at it now as a viable option for all riders, not just as a racing package for TTs and triathlon. I've now got the adaptor and a canister in my saddle bag. Although this type of product is one that, ideally, you'd never use, the Topeak performed perfectly and with its excellent build quality, it should last well beyond that one time where you really need it. Just be careful you don't freeze your fingers off!

Verdict

Provides a race day package for Sunday and quick puncture fixes for the Monday-Friday commute