Continental Grand Prix 5000 Endurance Test

Published: 2014-07-25 Last Update: 2019-10-11 by Jarno Bierman
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Closeup of Continental Grand Prix 5000

Update 2019-10-11: We've added the 1240 miles / 2000 km results and also added extra data that validates our results to the bottom of this article.

This is an endurance road test of a pair of Continental Grand Prix 5000 (go here for our full review of the GP 5000) that will be tested on our rolling resistance test machine every 620 miles / 1000 km. This test will take a while to complete as we expect to cycle about 62 miles / 100 km per week with an update to this article every 2-3 months.


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We've already done a test with a pair of worn Grand Prix 4000S II that was sent in by a reader who used them for 5000 miles / 8000 km. Because we received a lot of comments about the cracked rubber of that pair of Grand Prix 4000S II, we've decided to do an even better test with measurements every 620 miles / 1000 km. These measurements will give us valuable information about how the tires behave over their entire life cycle.


The bike (and tires) used for this test is stored in an underground basement where the ambient temperature is between 10 - 15 C year-round. There will be zero exposure to sunlight when the bike is in storage. We think these conditions are the best possible conditions to store tires so take this into account when reading the results.


Both the front 28-622 and rear 32-622 are inflated to an air pressure of 65 psi / 4.5 bars (checked every ride) that provides a relatively comfortable ride. Rider weight with gear is close to 75 kg and bike weight is 10kg.


On the road, we use latex tubes filled with tire sealant in both the front and rear tires. The tests are performed with a Continental Race 28 Wide inner tube that is only used for this test.


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Second Update at 1240 miles / 2000 km


Ride Statistics and Visual Inspection


Ride statistics
First update Second update Total
Days on bike 180 days 91 days 271 days
Total distance 620 miles / 1000 km 620 miles / 1000 km 1240 miles / 2000 km
Wet roads 101 miles / 162 km 107 miles / 171 km 208 miles / 333 km
Dry roads 523 miles / 838 km 518 miles / 829 km 1042 miles / 1667 km
Average temperature 12.5 C 18.3 C 15.4 C
Average speed 17.6 mph / 28.2 km/h 18.3 mph / 29.3 km/h 18.3 mph / 28.8 km/h
Inflation pressure 65 psi / 4.5 bars 65 psi / 4.5 bars 65 psi / 4.5 bars
Flat tires 0 0 0

After 1240 miles / 2000 km, the tires still look good but they have now lost their new tire look. The front tire looks best as the tread hardly wears. The rear 32-622 is now starting to show some wear in the middle of the tread. The casings of both tires are still undamaged.


This time around, total time on the bike was much shorter because the weather improved and a long-time knee injury didn't torture me as much.


Luckily, I once again had 0 flat tires which is not bad as I still didn't have a flat tire with this pair of Grand Prix 5000. After removing the tires I have checked both tires carefully and removed about 15 pieces of stone chip / glass. The pieces of stone chip / glass were stuck in the rubber but seemed to have been stopped penetrating the tire further by the casing / anti-puncture layer.


GP 5000 28-622 (front) Condition After 1240 Miles / 2000 km:

Continental Grand Prix 5000 28-622 after 1240 miles / 2000 km

GP 5000 32-622 (rear) Condition After 1240 Miles / 2000 km:

Continental Grand Prix 5000 32-622 after 1240 miles / 2000 km

Front 28-622 Measurements After 1240 Miles / 2000 km


Measurements GP 5000 28-622 (front)
New 0 miles / 0 km 620 miles / 1000 km 1240 miles / 2000 km
Weight 235 grams 233 grams 233 grams
Wear marker 0.70 mm 0.65 mm 0.65 mm
Tread thickness 2.6 mm 2.6 mm 2.5 mm
Width 28.5 mm 29.0 mm 29.1 mm
Rolling resistance 100 psi / 6.9 bars 10.3 Watts 11.2 Watts 11.3 Watts
Rolling resistance 80 psi / 5.5 bars 11.5 Watts 12.2 Watts 12.5 Watts
Rolling resistance 60 psi / 4.1 bars 14.1 Watts 14.6 Watts 14.9 Watts
Loading Chart...

Wear of the front 28-622 Grand Prix 5000 tire still seems to be non-existent. Tread thickness has now gone down from 2.6 mm to 2.5 mm but that's probably because unrounded, it went from 2.62 to 2.53 mm. At this rate, the tread will probably last longer than the rest of the tire.


The front tire again stretched just a little bit more and is now 29.1 mm wide on a 17C rim inflated to an air pressure of 100 psi / 6.9 bars.


The rolling resistance tests show us that rolling resistance has once again gone up. This time the rise in rolling resistance wasn't as dramatic and it could well be that we're now reaching a level where the rolling resistance will stabilize.


Measurements GP 5000 32-622 (rear)
New 0 miles / 0 km 620 miles / 1000 km 1240 miles / 2000 km
Weight 278 grams 274 grams 273 grams
Wear marker 0.90 mm 0.80 mm 0.70 mm
Tread thickness 2.7 mm 2.5 mm 2.4 mm
Width 31.8 mm 32.4 mm 32.6 mm
Rolling resistance 100 psi / 6.9 bars 9.7 Watts 10.5 Watts 10.8 Watts
Rolling resistance 80 psi / 5.5 bars 11.0 Watts 11.7 Watts 12.1 Watts
Rolling resistance 60 psi / 4.1 bars 12.9 Watts 13.6 Watts 14.0 Watts
Loading Chart...

The rear 32-622 Grand Prix 5000 shows more wear but at the current rate, it still looks like it's going to last somewhere around 5000 miles / 8000 km if the rest of the tire holds up.


The rear tire also stretched a bit more and is now 32.6 mm wide on our 17C rim, inflated to 100 psi / 6.9 bars.


Although the rear Grand Prix 5000 shows more wear, we see the same pattern in the rolling resistance tests. Rolling resistance has gone up again but at a slower rate than after the first 1000 km / 620 miles.


Let's hope we've now reached the point where the tires stabilize and we see rolling resistance go down again as the tread wears down.


Conclusion After 1240 Miles / 2000 km.


Treadwear of the Continental Grand Prix 5000 is very low. It looks like the tread is going to last more than 5000 miles / 8000 km on the rear tire and double that on the front. Most of my riding consists of a flat 40k lap with mostly straight roads and very little stopping and starting which is something that might add to the very low wear rate.


I'm happy about the puncture resistance of the Grand Prix 5000 as I didn't have a flat tire yet. As an extra precaution, I also use latex tubes filled with tire sealant to at least get me home when something small penetrates the tire. I checked both tires carefully but I didn't find anything that went through the tires yet.


After the first 620 miles / 1000 km I was shocked by the large increase in rolling resistance of the Grand Prix 5000. In the last 620 miles / 1000 km, rolling resistance has increased again but not at the alarming rate of the first 620 miles / 1000 km. We might have reached a point where rolling resistance stabilizes or goes down again when the tread wears down.


Scroll to the bottom of this page to find extra info that validates our results. We've performed tests with a Grand Prix 5000 with 60 km on our machine and a Grand Prix 5000 with 500 km on our machine.


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First Update at 620 miles / 1000 km


Ride Statistics and Visual Inspection


Ride statistics
Total distance 620 miles / 1000 km
Wet roads 101 miles / 162 km
Dry roads 519 miles / 838 km
Average temperature 12.5 C
Average speed 17.6 mph / 28.2 km/h
Inflation pressure 65 psi / 4.5 bars
Flat tires 0

After the first 620 miles / 1000 km, both the front 28-622 and rear 32-622 still look brand new. The mold line that runs through the middle of the tire is still easily visible on the front tire and can still be seen on the rear tire when you really look for it. The casings of both tires also still look like brand new.


We've had zero flat tires during the first 620 miles / 1000 km. After inspecting both tires, we did remove 2 small pieces of glass that were stuck in the tread but did not penetrate the tire.


GP 5000 28-622 (front) Condition After 620 Miles / 1000 km:

Continental Grand Prix 5000 28-622 after 620 miles / 1000 km

GP 5000 32-622 (rear) Condition After 620 Miles / 1000 km:

Continental Grand Prix 5000 32-622 after 620 miles / 1000 km

Front 28-622 Measurements After 620 Miles / 1000 km


Measurements GP 5000 28-622 (front)
New 0 miles / 0 km 620 miles / 1000 km
Weight 235 grams 233 grams
Wear marker 0.70 mm 0.65 mm
Tread thickness 2.6 mm 2.6 mm
Width 28.5 mm 29.0 mm
Rolling resistance 100 psi / 6.9 bars 10.3 Watts 11.2 Watts
Rolling resistance 80 psi / 5.5 bars 11.5 Watts 12.2 Watts
Rolling resistance 60 psi / 4.1 bars 14.1 Watts 14.6 Watts
Loading Chart...

Wear of the front 28-622 is very low. Weight has gone down by 2 grams and it looks like the tread is going to last a long, long time.


Something that surprised us was the width of the tire has increased from 28.5 mm to 29.0 mm which shows that the tire will stretch slightly in the first 620 miles / 1000 km even at our relatively low air pressure of 65 psi / 4.1 bars.


To make things clearer about the width measurements: the "new" width measurements were taken after the original rolling resistance tests. This means the tires have already run 60 to 90 minutes on the machine at pressures between 60 - 120 psi. In other words, some initial stretch is already included in the "new" measurements.


The rolling resistance tests tell us that rolling resistance has gone up by 4 - 9 % depending on air pressure which is something you might not expect from well run in tires. We have to wait for more measurements to see if rolling resistance stabilizes at this level, goes down, or goes up further.


Measurements GP 5000 32-622 (rear)
New 0 miles / 0 km 620 miles / 1000 km
Weight 278 grams 274 grams
Wear marker 0.90 mm 0.80 mm
Tread thickness 2.7 mm 2.5 mm
Width 31.8 mm 32.4 mm
Rolling resistance 100 psi / 6.9 bars 9.7 Watts 10.5 Watts
Rolling resistance 80 psi / 5.5 bars 11.0 Watts 11.7 Watts
Rolling resistance 60 psi / 4.1 bars 12.9 Watts 13.6 Watts
Loading Chart...

As expected, the rear 32-622 GP 5000 shows more wear than the front 28-622 GP 5000. Our measurements come in somewhere between 0.10 - 0.20 mm of wear in the first 620 miles / 1000 km.


Just like the 28-622 front, the rear 32-622 has stretched and its width has increased from 31.8 mm to 32.4 mm.


Even though the rear GP 5000 has slightly more wear, rolling resistance of the rear 32-622 GP 5000 has also gone up by 5 - 9 %. It looks like the rubber compound has already lost some of its ultra-fast rolling properties after the first 620 miles / 1000 km even when it's stored under optimal conditions.


Conclusion After the First 620 Miles / 1000 km.


Wear rate of the GP 5000 looks to be very low and puncture resistance also looks to be good as we had 0 flats in the first 620 miles / 1000 km.


Rolling resistance of both the 28-622 and 32-622 has increased by 4 - 9 % depending on air pressure which is something that actually surprised us. We think most people expect tires to become faster rolling when the tread wears down as there will be less material to deform.


Most tires that roll really fast have a lot of rebound in the casing/tread when you take them out of the packaging and deform the tire with your hands. After testing a lot of tires, we generally already know if a tire is fast or slow rolling simply based on how easily the tire rebounds when it's deformed. It looks like the GP 5000 loses some of these properties in at least the first 620 miles / 1000 km.


We'll have to wait for the next measurements to see if rolling resistance stabilizes at this level or the trend continues or reverses.


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Validating Our Results


Because the general thinking is that rolling resistance of a tire decreases as it wears, and our results are so counterintuitive, we've performed extra tests that we think proof our results are correct.


We've performed extra tests with a 23-622 and 25-622 Grand Prix 5000 that we used for our Grand Prix 5000 23, 25, 28, 32 mm comparison.


The 23-622 and 25-622 tires, together with the 28-622 and 32-622, were all tested at the beginning of 2019. The 28-622 and 32-622 went on to be used for the endurance test. The 23-622 went straight into storage and was never touched again. The 25-622 was used for inner tube tests and some other general validation testing.


This means the 23-622 has run for about 40 km on our machine and the 25-622 has run for somewhere around 500 km on our machine. During the inner tube tests and validation tests with the 25-622 Grand Prix 5000, we already noticed rolling resistance had gone up slightly. We didn't think much of it at the time as it was within the margin of error of the machine and possibly the inner tubes.


The Grand Prix 5000 endurance test has now taught us the higher rolling resistance of the 25-622 Grand Prix 5000 was probably the result of the tire itself losing some of its ultra-fast rolling properties.


To perform these validation tests, we had to run the 23-622 and 25-622 again with the same inner tube that we used for the GP 5000 comparison back in January. This means it had to be run for another 20 km on the machine to warm everything up so the 23-622 has run for at least 60 km and the 25-622 somewhere around 500 km.


All tests were performed on the same day as the 1240 miles / 2000 km tests of the 28-622 and 32-622 endurance test tires.


Test Results: 23-622 60 km and 25-622 500 km


23-622 GP 5000 with 60 km
Tire 23-622 23-622
Tire age (from manufacturing date) ~ 130 days ~ 410 days
Total distance 0 km 60 km
Rolling resistance 100 psi 10.6 Watts 10.9 Watts
Rolling Resistance 80 psi / 5.5 bars 12.2 Watts 12.4 Watts
Rolling Resistance 60 psi / 4.1 bars 14.8 Watts 15.0 Watts
Loading Chart...
25-622 GP 5000 with 500 km
Tire 25-622 25-622
Tire age (from manufacturing date) ~ 90 days ~ 370 days
Total distance 0 km 500 km
Rolling resistance 100 psi 10.7 Watts 11.4 Watts
Rolling Resistance 80 psi / 5.5 bars 12.1 Watts 12.6 Watts
Rolling Resistance 60 psi / 4.1 bars 14.2 Watts 14.8 Watts
Loading Chart...

What we see above is the 23-622 Grand Prix 5000 that was in storage for 280 days comes very close to the original measurements. On average, rolling resistance has increased by 2.0%.


The 25-622 Grand Prix 5000 that was also stored for 280 days, but was also taken out of storage and has seen ~ 500 km on the machine, clearly has a higher rolling resistance. On average, rolling resistance has increased by 5.0%


When we look at the combined numbers of both the 28-622 and 32-622 Grand Prix 5000 that were used for the endurance test, we see rolling resistance has increased by 6.3% after the first 1000 km.


We feel it's safe to conclude that the measurements we provide in the "Grand Prix 5000 Endurance Test" are correct as we were able to get very close to the original numbers with the 23-622 Grand Prix 5000 that was in storage. It's very well possible this increase of 2.0% is partly because the tire has run for an extra 20-40 km between these measurements.


We also feel safe to conclude that, at least the Continental Grand Prix 5000, sees an increase in rolling resistance because it loses some of its ultra-fast rolling properties. We attribute this loss to the deformation of the tire as it rolls. Storage alone doesn't seem to increase rolling resistance all that much. This increase in rolling resistance seems to be the highest in the beginning and, based on our 2000 km endurance test results, seems to level off at higher mileages.


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