Road bike tyres

The tubetype, with an inner tube, is the most common system: easy to fit, repairable at the roadside with a spare inner tube, and available across all price ranges. The tubeless tyre eliminates the inner tube, which removes the risk of punctures, reduces rolling resistance by 1 to 3 watts per tyre, and allows you to ride at lower pressures for greater comfort. The downside: fitting is more technical, requires sealant (to be replaced every 2 to 4 months) and a compatible rim. For a cyclist covering 5,000 km a year, the benefit is real and well-documented.

TPI (Threads Per Inch) measures the thread density of the casing. The higher the TPI, the more flexible and lightweight the casing: better performance, greater comfort, and better grip when cornering. For a high-quality road tyre, aim for over 100 TPI. Above 200–320 TPI (Vittoria Corsa, Veloflex), you reach the top end of the competition range. Note: some manufacturers add up the TPI of several plies. A tyre advertised as 330 TPI may correspond to three layers of 110 TPI, not a single carcass. The flexibility felt during fitting remains the best indicator in practice.

Two models that dominate the high-end road segment. The Continental GP5000 (tubetype or STR in tubeless) excels in rolling resistance with its Black Chili rubber and Vectran protection. The Michelin Power Cup counters with a very supple casing and a dynamic rubber compound. In terms of measured rolling resistance (bicyclerollingresistance.com), both sit at around 10–11 watts at 30 km/h and 7 bar. The GP5000 offers slightly better puncture protection. The Power Cup is a touch more responsive and comfortable. Final choice: depending on your riding profile and preferences, both are excellent all-round tyres.

The accepted rule of thumb in the cycling community: the ideal pressure in bars is approximately 10% of the total weight of the system (cyclist + bike) for a 25 mm tyre. For a 70 kg cyclist with an 8 kg bike (78 kg total), this works out at around 7.8 bar at the rear and slightly less at the front. For 28 mm tyres, reduce the pressure by about 1 bar. For tubeless tyres, reduce it further by 0.5 to 1 bar. These figures are starting points: the manufacturer’s recommendations printed on the tyre sidewall remain the absolute benchmark and must never be exceeded.

Tyre/rim compatibility depends on the ratio of the rim’s internal width to the tyre’s cross-section, as defined by the ETRTO. For a rim with an internal width of 19 mm (common on modern disc wheels), the optimal cross-sections are 25 to 32 mm. For a 21 mm internal rim, the range goes up to 30–35 mm. Fitting a 23 mm tyre on a 21 mm internal rim creates a so-called ‘bulb-shaped’ profile, which is detrimental to stiffness and aerodynamics. The general rule is clear: a tyre wider than the external rim width is acceptable, whilst a tyre narrower than the internal rim width should be avoided.

For daily training and high-mileage weeks, a tyre with reinforced protection (Vectran, Duraskin or Aramid layer) is a sensible investment. It costs a few extra watts in rolling resistance but saves time and frustration. Semi-slick tyres with intermediate protection, such as the Continental Grand Prix 4 Season or the Schwalbe Durano Plus, offer a good compromise for training. Racing tyres (GP5000, Corsa) should be reserved for specific rides or competitions; their thin sidewalls and flexible casing do not withstand intense daily use for long.

There is no universal mileage figure, as conditions vary so much. On a mid-range tyre (GP4000, Michelin Pro4), a rear tyre lasts between 3,000 and 5,000 km in standard road use, a front tyre twice that. A high-end tyre with a thin casing (Corsa Speed, GP5000 TT) rarely lasts more than 2,500–3,000 km on the rear wheel. Signs to watch out for: casing visible beneath the tread (visible fabric weave), cracked sidewalls, and an increasing number of punctures. Never wait until a tyre is in tatters: the loss of grip and performance is noticeable well before that.

Yes, a tubeless or tubeless-ready tyre can be fitted to a conventional tube-type rim, provided an inner tube is added. In this case, you lose all the benefits of tubeless but retain a high-quality tyre. The reverse operation (fitting a tube-type tyre to a tubeless rim) is also possible, with an inner tube being mandatory. However, using a tube-type tyre without an inner tube on a tubeless-ready rim is not recommended: the seal is not guaranteed and the bead of a tube-type tyre does not seat properly in the tubeless groove.

The sealant gradually dries out inside the tyre, especially in hot weather. Under normal conditions, it should be checked every 2 to 3 months and replaced as soon as there is less than 15–20 ml left in the tyre. For a 25–28 mm road tyre, the recommended initial quantity is 30 to 45 ml. Using too little sealant negates the puncture protection. Latex-based sealants (Stans NoTubes, Orange Seal) dry out faster but seal punctures more effectively. Water-based sealants (Effetto Mariposa Caffélatex) last longer but are less effective on large punctures.