das Hinterrad
rear wheel
The rear of the two wheels on a two-wheeled vehicle, especially on a bicycle or motorcycle.
Ich habe einen Platten am Hinterrad meines Fahrrads.
I have a flat tire on the rear wheel of my bicycle.

rear wheel
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rear wheel
The rear of the two wheels on a two-wheeled vehicle, especially on a bicycle or motorcycle.
Ich habe einen Platten am Hinterrad meines Fahrrads.
I have a flat tire on the rear wheel of my bicycle.

The word is a clear compound of the adverb 'hinter' (behind/rear) and the noun 'das Rad' (wheel). So it literally refers to the wheel located at the back of the vehicle.
Bei den meisten Fahrrädern treibt die Kette das Hinterrad an.
On most bicycles, the chain drives the rear wheel.
The direct opposite is 'das Vorderrad' (front wheel), formed from 'vorne' (front) and 'Rad' (wheel). This pair shows a typical pattern for describing positions on vehicles.
Die Bremse am Vorderrad ist oft stärker als die am Hinterrad.
The brake on the front wheel is often stronger than the one on the rear wheel.
Common expressions are 'einen Platten am Hinterrad haben' (to have a flat tire on the rear wheel), 'das Hinterrad blockiert' (the rear wheel locks up), or 'das Hinterrad wechseln' (to change the rear wheel). The preposition 'am' is often used to describe the location of a problem.
Auf dem Weg zur Arbeit hatte ich einen Platten am Hinterrad.
On the way to work, I had a flat tire on the rear wheel.
front wheel
'Hinterrad' and 'Vorderrad' both refer to wheels on a bicycle, motorcycle, or vehicle. The difference is the position: the 'Hinterrad' is at the back, and the 'Vorderrad' is at the front. It is easy to confuse the words if you are only speaking generally about a wheel on a vehicle. To be precise: at the front, by the handlebars or the front of the vehicle, is the 'Vorderrad'; at the back, by the saddle or the rear of the vehicle, is the 'Hinterrad'.

Nach der Fahrt ist das Hinterrad meines Fahrrads plötzlich platt.
After the ride, the rear wheel of my bicycle suddenly had a flat tire.
Beim Bremsen rutschte das Vorderrad auf dem nassen Weg weg.
When braking, the front wheel slipped on the wet path.