Price at Evans Cycles: £19.99
The Stans NoTubes Tyre Sealant Quart is the first choice of riders around the world for tubeless conversion and flat prevention. It seals punctures up to 1/4" (6.5mm) quickly and will stay liquid in a mountain bike tire with a thin casing for 2-7 months on average. Riding in arid climates or storing the bike in a hot area will requires more frequent monitoring of sealant levels. Special anti-freeze agents allow the sealant to be used in environments as cold as -30deg F.