Bicycle Quarterly 15 Tire Drop Chart

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Bicycle quarterly 15 tire drop chart. Tyre drop is hard to measure but berto did a shedload of measurements and plotted the pressure needed to give a tyre drop of 15 percent for a range of rider weights and tyre widths. Tire pressure for 15 wheel drop wheel load. This determines the effect that pressure and load has on a tire. Road bicycle tire pressure calculators.

This tire has too much air it loses energy bouncing. The 15 as desirable tire drop was based on the recommendations of several tire manufacturers but not on actual testing. When i inflated my front wheel to 40 psi it did drop by around 15 percent. He then averaged the values and drew his chart for a tire drop of 15.

Tire pressures for 20 mm tires. Brian may 29 16 at 5 27. The debate about 23 v 25 tyres i found a tyre pressure calculator which tells you what you should be running based on 15 tyre drop. Rider and bike weight.

According to frank berto and jan heine of bicycle quarterly magazine two top bicycle science guys the most efficient bicycle tire pressure is one that gives you a 15 drop in tire height when you get on the bike. I measured the change of height of my handle bar with and without loading my bike and compared it to the tire s height measured from the tire s edges to the rim s edge. Secret gravel passes of the cascade range randonneurs in mid century france forgotten japanese mountain roads. This tire has too little air it s squishy and hard to turn.

This chart which comes from frank berto measures what s called tire drop. Much of it depends on the tires you run. The chart is only applicable to light bicycle rims with a specific rim tire interface. I guess i will pump a bit higher than the chart s recommendations.

Road bicycle tire pressure calculators using jan heine 15 drop and michelin chart methods. In bicycle quarterly you ll read. Rider bike lb. Image courtesy of bicycle quarterly.

Rhône alpes france piedmont italy makes this page possible 15 drop method weight measured at wheel. Berto measured the tire drop above. If you use rims of other brands please send rim profiles to the tire maker for recommendations. Having read the debate about 23 v 25 tyres i found a tyre pressure calculator which tells you what you should be running based on 15 tyre drop.

When this chart was first published which was more than 20 years ago it was determined that the tire drop should be about 15 percent. Recently we have done some tests on tire width and weight and make them good blogs to help you choose the right tires for your bike quickly. Technical articles on the performance of wide tires frame stiffness and. It uses the graph from the bike quarterly.

Here s a graph of his recommendations showing the relationship between pressure and wheel load for each common road bike tyre size. Tire inflation for 15 wheel drop in relation to wheel load and actual tire width 4example.