The bigger the tire, the lower the rolling resistance at the same air pressure. When you run lower air pressures, the differences get it gives an excellent opportunity to explore the differences between wider and smaller road bike tires. Noteworthy is the very flat rolling resistance graph of this tire, dropping air pressure to 80 psi increases rolling resistance by only 1.5 watts per tire. This is a great feature because rider comfort will increase greatly at 80 / 90 psi at a very low cost. Performance in the rolling resistance test is great. At an air pressure of 120 psi, rolling resistance is a low 12.2 watts, which is excellent for a Tour / Race type tire. Dropping air pressure to 100 psi results in a rolling resistance of 12.9 watts. Lowering air pressure even lower results in a rolling resistance of 13.7 watts at an air pressure of 80 psi.

As noted previously, the measured weight is 215 grams which is less than the 225 grams specified by Continental. The Grand Prix 4000S II is also quite a big tire with a width of 27 mm and a height of 25 mm on a 17C rim. All in all, not bad for a tire with a weight of 215 grams. The tubeless GP 5000 is available in 25, 28 and 32mm widths, plus a 28mm wide 650B version. Our samples of the 25mm versions weighed an average of 302g each; we've seen reliable reports of 295g samples too. That's heavier than some comparable tubeless-ready tyres (a 25mm Schwalbe Pro One weighs about 255g) because Continental has gone for a fully tubeless construction with an airtight rubber layer on the inside. Active Comfort: The revolutionary approach in cycling. Embedded in the tyre construction the Active Comfort Technology absorbs vibrations and smoothens your ride.So in my view these tyres are well worth the money, not only for life span, performance, grip, reduced rolling resistance, and puncture resistance.

NOTE: As of 2021, we've improved the puncture resistance tests and now provide 'Total Puncture Score' as the main puncture resistance indicator. If the text below mentions puncture resistance, we're referring to 'Puncture Force Sharp Needle' which was our original test. The expertly designed layer within these tyres acts as an intermediate between the sharp outside objects and the inner tube within. With regards to grip, the Conti sits in the middle of the field. Like the Schwalbe, it provides good control at the limit and a predictable grip threshold. The sidewalls are relatively stiff and can sometimes cause the tire to feel skittish on uneven surfaces. We ran the tire at 6.5 bar, which already feels plenty hard, so we strongly recommend keeping the pressure below that mark. However, according to Conti’s recommended pressure settings, that is already at the lower end of the scale.What sets the GP's apart from other race tyres, which also offer impeccable grip, is the incorporation of the Vectran Breaker. and models as accurately as possible. Comparing a 20C tire with a 28C from another brand doesn't give any useful data in my opinion.

I'm not sure at what kind of speed this turnover point would be. This also depends greatly on the tire/wheel combo. Chain reaction Cycles and CRC are trading names of Wiggle Ltd (In Administration) registered in the United Kingdom at 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN, On a rough drum — which we used to emulate normal road conditions, the differences were even smaller. The Conti was measured at 32w at 40kph, dead in the center of the tires tested that ranged from 29.9w (Pro One) up to 36.1 (Clement LCV). With the AS TR, Continental has paired the speed of the Grand Prix 5000 and the longevity and protection of the Grand Prix 4 Season. The new tyre has a boosted tread pattern, multi-layer overlapping ply construction and additional sidewall protection - although from afar it looks very much like a "regular" GP5000. This article has been partially replaced by our Continental Grand Prix 5000 23, 25, 28, 32 mm comparison. The newer Continental Grand Prix 5000 article is much more detailed and includeseven bigger. At a comfortable 80 psi, you're only giving up 2-3 watts for a pair of tires when going for the 28C size. That's good Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it? It's still available from some retailers but the Grand Prix 5000 TL has been nominally replaced by the Grand Prix 5000 S TR. We'll keep these details until retailers run out. Of course, it's always possible to slice open and puncture any tyre on a first ride, (it's sods law) but the likelihood is much lower on these. We've managed entire summer seasons rolling on these with no punctures - and only a handful of flats when running them even in winter. Weight is within +/- 10 grams of manufacturer specifications for all tires. With the 23C being spot on, 25C being 10 grams lighter and the 28C

They're "variable" when fitting them too, some are so tight you wouldn't want to risk using them on a ride because the idea of sitting at the roadside in 5 degrees and rain attempting to get the thing off the rim is just too awful to contemplate. While the tread puncture resistance score is slightly below average, the sidewall puncture resistance score of 5 points is slightly better than most other comparable tires. The Schwalbe One V-Guard ( review) is a tire which comes very close to the Grand Prix 4000S II in the rolling resistance test. The Schwalbe One has a better tread puncture score (12), but a lower sidewall score (4). Puncture Force Blunt Needle: The Blunt needle has a flat tip and won't split the casing wires. To puncture the tire, the blunt needle has to cut the casing wires. Keep this in mind when you're comparing, but I don't think anyone is going to use 120 psi in a 28C tire anyway. The tyre does make my bike roll with a lot less effort and will continue the roll for some distance without power.Sealant required. The GP 5000 TL has a layer of rubber on the inside to retain air; the GP 5000 S TR doesn't. Sure, there are tyres that can boast a more supple rubber and lower rolling resistance that could save you 1.5watts - but these offer an almost-perfect ride quality coupled with a significantly reduced likelihood if spending time beside the road fixing punctures. Just to prove a point I use a newton+ power meter and looking at the data , you can see a reduction in Rolling Resistance.