Tyre pressures.

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nicklouse
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Tyre pressures.

Postby nicklouse » Sat Jan 16, 2010 15:30 pm

What is the correct inflation pressure for my tire?

It is impossible to make a general recommendation on inflation pressure for a specific bicycle or a particular tire. The “right” inflation pressure depends mainly on the load exerted on the tire. This weight is mainly influenced by the weight of the rider and any luggage. Contrary to a car, the vehicle weight is only a minor part of the total weight. In addition there is a great diversity of individual preferences with regard to low rolling resistance or suspension comfort.

The permitted inflation pressure range is marked on the tire sidewall. Remember that the higher the inflation pressure, the lower are the rolling resistance, wear and likelihood of a puncture. The lower the inflation pressure, the higher are the comfort and grip that the tires provide.
The list of inflation pressure recommendations on the right can only provide a very general guide. The recommendations are for an “average rider” weighing about
75 kg.

If you are heavier or carry luggage, you should chose a higher inflation pressure. You can also increase the inflation pressure if you prefer lower rolling resistance. It is recommendable that higher inflation pressures are used on very small diameter tires such as low profile race bikes and folding bikes.

Lighter weight riders or riders who prefer a comfortable ride can chose an accordingly lower inflation pressure, but the actual tire pressures should never be higher or lower than the maximum and minimum inflation pressures marked on the tire sidewall.


Tire Section width and Recommended inflation pressure
20 mm 7,5-9,0 bar
23 mm 7,5-8,0 bar
25 mm 7,0 bar
28 mm 6,0 bar
30 mm 5,5 bar
32 mm 5,0 bar
35 mm 4,5 bar
37 mm 4,5 bar
40 mm 4,0 bar
42 mm 4,0 bar
44 mm 3,5 bar
47 mm 3,5 bar
50 mm 3,0 bar
54 mm 2,5 bar
57 mm 2,2 bar
60 mm 2,0 bar

1 Bar is 14.5038 psi

taken from
http://www.schwalbe.co.uk/pdf/techinfo.pdf
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown

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nicklouse
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Postby nicklouse » Sat Jan 16, 2010 15:34 pm

and from Alex

Alex wrote:
There is NO ANSWER to the "What tyre pressure for..." question. There are too many variables. A 2.5" tyre does not need as high a pressure as a 1.5" tyre. A fat rider needs more tyre pressure than a race snake. Downhill riders looking for grip at the expense of all else needs less pressure than a cross country boy heading out on a 50 mile epic. You need more tyre pressure whilst riding rocky trails than riding un-rocky trails.


To set your tyre pressure:
Sit on your bike, look at the back tyre. It should be squidged a little. If it is squidged a lot, add a bit more pressure and test again. If there is no give at all, let a little out. Your tyre pressure should ALWAYS be within the min/max numbers on the sidewall.

If you are pinchflatting constantly, add more pressure. If you are getting bounced around or not getting much grip, take pressure away. Either way, do it carefully. Pressing the valve in on your tube releases more pressure than you think it does. If you haven't got a pump, don't drop your pressures.


an interesting site to give you some figures to start with.

http://mtb.ubiqyou.com/
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."

Parktools :?:SheldonBrown


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