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Continental GP5000 TR wear
I have just replaced my GP500TR tyres with like for like replacements. The original tyres were approaching but not yet on the limit as indicated by the wear indicators. I was surprised that the new tyres seemed to be dramatically better in terms of comfort and rolling resistance which surprised me. Have others found that these tyres performance deteriorated noticeably during their lifetime? Is this the case with all tyres or just the GP's? Interested to hear others experience.
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5 comments
New rubber always feels better.
Also shiny bits make you go faster.
I've always found too that replacement tyres always felt more comfortable and always assumed, as I haven't settled on one particular model, that my latest ones were better in the comfort department. Reading your post, maybe the side walls of tyres get stiffer with age, gradually so you don't notice until you fit new ones.
And yet objective measurements seem to show that worn tyres have less rolling resistance (as expected, as there is less rubber to deform, being thus closer to the pneumatic ideal). Another instance of subjective perceptions being wrong.
I'm all for objective data, but if you're going to make such a claim please actually provide evidence.
The main source of objective data for bicycle tyre rolling resistance that I'm aware of is the aptly named Bicycle Rolling Resistance website, who have done a long term test of the GP5000 (not the TR version that OP is using) and they clearly found lower rolling resistance with newer tyres:
https://www.bicyclerollingresistance.com/specials/grand-prix-5000-endura...
BRR had previously rested the GP4000 S II, the results of which were a bit more equivocal but still tend to indicate the new tyres have lower rolling resistance, when inflated to real world air pressure:
https://www.bicyclerollingresistance.com/specials/new-vs-worn-gp4000s-ii
(the test tyres were 28mm, so 60 or 80 PSI seems more realistic than 100 or 120 PSI).
Another consideration is aerodynamics - Silca have data to suggest that new tyres are more aero (presumably because they are still rounded):
https://silca.cc/en-gb/blogs/silca/part-5-tire-pressure-and-aerodynamics
(although this assumes you have an aero tyre-wheel combination to begin with - it's unclear how big the effect would be on a non-aero tyre/wheel system.)
This forum post has a graph that purports to support the claim that worn tyres do have lower rolling resistance, but can't find the original source to back it up:
https://forum.slowtwitch.com/t/rolling-resistance-crr-new-vs-used-tires/...
Yeah I've found that with my bike on Vittoria Rubino Pros. The bike feels much faster and livelier with a new set on.