Don't get caught out without a puncture repair kit whilst out cycling. A must have for every cyclist who goes out riding, allowing you to do a quick repair at the roadside and get back riding. Tub glue is required when using tubular tyres and attaches them to the rim. An alternative too tub glue is tub tape which is less messy and easier to use. The increasing use of tubeless tyres, especially in mountain biking requires sealants in the tyre which help seal up the tyre in the event of any small cuts.