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VALIDATION
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Find Optimal Tyre Size for any Surface
rim
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15
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>> helps you work out the best tyre for each riding surface by rolling resistance (as well as weight / rim size) <<
15.5
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16
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16.5
8
17
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Your weight (with bike & equipment) 70kg17.5
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18
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Do you have preferred Tyre Width? 30mm18.5
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19
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Internal Rim Bead Width/Size (default is 22c) 23mm (c)19.5
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2020
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External Rim Width (leave BLANK if Unknown) 30mm (c)20.5
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if you don't know your wheel width then our guess is >>27.5mm21
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closest tyre that will "blow up" to match this rim is about >>27.3mm21.5
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perhaps corresponding to the following
Vittoria Corsa Speed TLR 23C Jet6+tubeless
<< experimental
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23
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23.5
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Enter Surface Conditions (% or ratio or distance)
Distance on 0 to 100 scale
Severity24
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24.5
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25
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Amount of Gravel/Off Road..... 0moderate25.5
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0% CRR= 0.018126
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26.5
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Amount of Cobbles..... 0moderate27
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0% CRR= 0.018127.5
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28
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Rough tarmac..... 4528.5
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45.5% CRR= 0.0064
29
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29.5
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Normal / typical tarmac..... 5030
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50.5% CRR= 0.0056
30.5
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31
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Super smooth tarmac..... 431.5
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4% CRR= 0.00532
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32.5
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Your overall surface is described as…………..All Tamac33
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ave CRR = 0.0059533.5
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34
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34.5
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For this surface, your rim & your weight recommend tyre is
26.1mm35
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At this size (26.1mm) ...then pressure should be about70.1psi35.5
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At this size & pressure ...then contact patch will be about331.4mm236
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At this pressure, we estimate your tyre will actually measure...
29mm36.5
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37
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vs your choice...
37.5
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but you self-selected a tyre size of 30mm30mm38
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At this size (30mm) ...then pressure should be about64.2psi38.5
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At this size & pressure ...then contact patch will be about392.7mm239
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At this pressure, we estimate your tyre will actually measure...
32.3mm39.5
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40
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alternative calc:
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https://fft.tips/pressure
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Share this sheet:
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https://fft.tips/surface
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Related Sheets
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https://fft.tips/pressure2
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https://fft.tips/tyre2
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