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I just purchased a new bicycle pump with a pressure gauge and after checking my tyres, inflated them to the top end of interval printed on the tyres (4.5-6.5 bar).

I'm wondering when the tyres should be in the lower range of the interval, and when the higher end is appropriate. Is it a question of weight? Type of terrain I'm going to ride?

The tyres in question are Schwalbe Kojaks, mounted on a light urban hybrid bike.

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possible duplicate of What pressure should I run my Mountain Bike tires at? –  Neil Fein Sep 2 '10 at 20:28
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Duplicate of this question, vote to close. –  Neil Fein Sep 2 '10 at 20:28
    
...unless there's something specific about Kojaks? (I have a pair, and except for the higher pressure rating, there's not much that general inflation advice won't cover.) –  Neil Fein Sep 2 '10 at 20:55
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Disagree that it's a duplicate -- the other question was about trail riding, this is about urban riding. Plus there's the question of what the minimum rating is for. –  darkcanuck Sep 3 '10 at 1:01
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4 Answers 4

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My general rule of thumb is 10-15% lower than the posted maximum for normal road riding. Higher if you're carrying a load or are a larger rider, lower if you're a lighter rider. There's an article in Bicycle Quarterly that's a pretty good guide on tire pressure for road riding depending on weight and width of tire.

http://www.vintagebicyclepress.com/images/TireDrop.pdf

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Well, I am a large rider and I was advised (and seen) that I need to keep my tires to the max before each ride. If I do a long ride - over 2 hours - I have to make sure to check and inflate accordingly. I ride 700cc road tires and with my weight a tire that starts to slack gets a "pinch flat". Basically the tube pinches inside the tire. If you are a very light rider, you can get away with a little less.

If you are riding a bike with "knobbie" tires like a mountain bike, you can get away with less too.

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A higher pressure will be faster and 'harder' (less suspension); a lower pressure will be slower (more rolling resistance) and smoother (it'll ooze over cracks and bumps).

I was told that the 'max pressure' is just a guideline and that in practice you can go a little higher. I think my tires say 85 psi maximum, and I inflate them to 95 (not because I'm especially heavy but because I'd prefer to go faster with less effort than smoother).

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