Moving from 25’s to 28’s...different PSI?
Hi all,
Incoming bike that will accept 28’s. Bought a set of Conti GP5000 700 x 28. Do I keep the same tire pressure I run now on my GP4000’s 700 x 25 or adjust? I’m very happy with the tire pressure I run now. As always, thank you all in advance! Steve |
Drop er 5-10 and give it a go. You have some more tire on the ground now so enjoy the ride.
Tubeless? |
Inflate to recommended factory-specified pressure.
Then deflate/test until you find *your* particular handling/comfort "sweet spot" that works. :banana: |
I haven't run 25's in a long time, but for 23's I run 90/100 (f/r). For 28's that would drop to 75/82 (f/r). YMMV
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A rough rule of thumb is that tire pressure is inversely proportional to tire width. Since 28mm tires are 12.5% wider than 25mm, a good starting point is to lower the pressure by 12.5%. Then adjust from there based on ride feel and preferences.
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3-4%
Josh at Silca recommends dropping 3-4% for each mm wider in tire width.
So 9-12% less than what you currently run. |
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Part 1 of our episode on Asymmetry starts to get into this topic and brings some context from racing: https://marginalgainspodcast.cc/asymmetry-part-1/ |
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I'll just add that while lower pressure feels great on rough roads, on smoother roads it can feel funky if you don't spin smoothly or are sprinting out of the saddle - undamped suspension can get bouncy...
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