Cycleops
Legendary Member
- Location
- Accra, Ghana
This might interest you from Bike Radar:
https://www.bikeradar.com/features/tech/fast-road-tyre-group-test/
https://www.bikeradar.com/features/tech/fast-road-tyre-group-test/
Well I assure you my daughter has found the Vittoria Corsa Speed G+ 2.0 (TLR) to do the best business, most recently last Saturday (25 front 28 rear):I never took Vittoria Corsa's to have that super low rolling resistance to be accurate from my own riding.
Do you ever look at that site @Cycleops ?The https://www.bicyclerollingresistance.com/the-test
Is a few years old now and may feature models that are no longer available, plus all tubed I think.
Agree; bit like the amount of climb on a route using various RwGPS, Openrunner etc etccomparing values between the two test systems seems much more likely to be misleading.
The stated reason for a tube was the time taken for tubless sealent to seal and my guess is that a latex tube may be closer to tubless than butyl one.40kg per wheel sounds about right? 70kg rider and 10kg bike.
Why test tubeless with latex I don't know!!
And the worst is that even different types of Schwalbe Marathon have very different rolling resistances. As do Vittoria Rubinos and probably Corsas, but I suspect Marathons have the widest variation between subtypes of the same production year.In other words these tests boil to numbers of limited real world significance beyond, yes you can buy tyres that have different rolling resistance. Something anyone who has riden Schwalbe Marathon or Vittoria Randonneur already knows.
Good morning,
The stated reason for a tube was the time taken for tubless sealent to seal and my guess is that a latex tube may be closer to tubless than butyl one.
At first glance adding a tube might be seen as having no relative effect, but if you are looking for tiny differences who knows as it may be "the straw" that changes tyre performance on the test right.
40kg does sound reasonable but one very big difference between the test rig and the road is that the load is constant on rig and highly variable on the road. If you let enough air out of your tyres you can really feel them bounce as you pedal, so clearly the load is varying significantly.
Neither this test or BBR change the "road surface" which could reasonably be exected to give different results.
These tests remind me a bit of HiFi tests in the 1970s, when a perfect sine wave was fed in an amplifier and the amp's performance was measured on how much it distorted it. By this time nobody could hear the tiny levels of distortion.
In other words these tests boil to numbers of limited real world significance beyond, yes you can buy tyres that have different rolling resistance. Something anyone who has riden Schwalbe Marathon or Vittoria Randonneur already knows.
Bye
Ian
And the worst is that even different types of Schwalbe Marathon have very different rolling resistances. As do Vittoria Rubinos and probably Corsas, but I suspect Marathons have the widest variation between subtypes of the same production year.
Which Rubinos? There seem to be at least three subtypes on sale most of the time. Once it was 3, pro g+ and pro folding. Probably different today. All with different rolling resistance.Why Rubinos I've found them very good as a budget mid level tyre.
To be honest, the resistance generated by the tyre on your rims is generally less important than that generated by the tyre around your middle.
Which Rubinos? There seem to be at least three subtypes on sale most of the time. Once it was 3, pro g+ and pro folding. Probably different today. All with different rolling resistance.
Saying you found Rubinos good is almost as little info as saying you think tyres are good. It's probably excellent marketing for the poorer tyres in the range but it's really unhelpful to buyers.
Also the test spec was 28mm tyres, with 40kg load (implies a female rider or 'boy')