Continental Grand Prix 4000 Black Chili Compound Road Race Tyre

Product Information

While the GP TL was better than many previous tubeless tyres for ease of fitting, there were still rims it didn't quite fit easily. We've found the GP S TR is better still, but you might still run into not-quite-compatible combinations.

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.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, The rear tyre is a 28mm GP4000S2 so I decided a 23mm tyre would be fine for my requirements on the front. NOTE: Grip test data is only available on tires tested after November 2018. You can find more information about our grip test here: Introducing Grip Testing Static Grip Test Results

All in all, I think the differences aren't that significant, in particular between the 23C and 25C tires. I'm looking forward to repeating this

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Sealant required. The GP 5000 TL has a layer of rubber on the inside to retain air; the GP 5000 S TR doesn't. 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.

Between finger and thumb, you can feel that the GP 4 Season is stiffer than a lighter summer tyre because of this extra protection, but for the casing Conti uses the same thread count at 330tpi (actually three layers of 110tpi) as it does in the GP 5000s. Compared to rival all-season tyres such as the Michelin Power All Season with its three layers of 60pti, it is much more supple. Performance 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.

How We Test Bicycle Tires

The tyre does make my bike roll with a lot less effort and will continue the roll for some distance without power. I'm not sure at what kind of speed this turnover point would be. This also depends greatly on the tire/wheel combo.

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?

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. To read about all other test conditions and how tires are tested, please read the Rolling Resistance Test Conditions For riders who want to carry their summer speed through the winter without puncturing, these are the tyres for the job"