Peaty’s tubeless sealant

As well as testing Peaty’s tubeless sealant on the trail, where it continues to stave off punctures, we also did some experimentation in the workshop. We mounted a 29x2.3in tyre on a rim, added the recommended 100ml of sealant and inflated it to 30psi, then attempted to puncture it with a variety of different picks, screwdrivers and even a knife.

When we pierced the tyre with a 3mm pick, a quick bit of wheel rotation and a couple of bounces encouraged the nanoplatelets in the sealant to plug the hole pretty rapidly, leading to only a small drop in pressure. A 4.5mm screwdriver caused a little more pressure loss, but the slit was soon sealed. After some time and intermittent leaking, a 6mm gash was dealt with successfully, though we did need to top up the tyre afterwards. Peaty’s sealant even held its own when faced with an 8mm hole. The tyre did deflate though, and still leaked a bit once pumped back up. In the end, it was only a 10mm slice that proved too much for the fluid to cope with.

While we’re impressed with its sealing abilities, we’d advise adding a touch more Peaty’s sealant to your tyres than the instructions recommend. Because it’s that bit gloopier than most other formulas, it doesn’t coat the inside of the tyre quite as easily.

Price $37 (1l bottle)

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