i think you need the most friction in your feet and hands
It's hard to say where you'd need the mostfriction, as riding a bike requires several thingsto work together. And in each of those places you need enough friction.
-you can't ride if tires will slip too badly on the ride surface
-you can't ride if tires will slip too badly on the rims
-you can't ride if wheels won't stay in the frame/fork
-you can't ride if you can't stay on the bike
You'd need it pretty much everywhere apart from the bearings. The grips need friction so that your hands don't slip. The pedals need friction so that your feet don't slip. The seat need a bit of friction too. The rims need a bit of friction to prevent the tires from slipping. The tires needs lots of friction not to slip against the ground. the brakes need plenty of friction to be able to slow you down.
In the bearings.
In the middle so you can adjust it when needed
mountain climbing
show someone on a mountain riding a bike
mountain bike riding
The forces acting on the bike is gravity, air resistance and friction.
applied, normal, and friction
Friction - several different kinds - and inertia. If riding uphill, also gravity.
Its like mountaineering somewhere for example:riding a mountain bike on a mountain and if you don't know what mountaineering mean then i'll tell you it means the same its like riding a bike on the mountain.
Because the portion of tire touching the ground is not moving relative to the ground.
about 50-60 psi for uphill riding
Friction lets the drive wheel push you forward, and allows your brakes some bite. Friction make it possible to hold on to the bars. Friction lets you steer.
riding a bike walking siting down riding a roller coaster sledding skiing grating food pretty much anything