Depending on your purpose, a motorcycle ramp can also be used for bicycles. However, they are specifically designed for motorcycles and Motocross dirt bikes.
Motorcycle ramps are used for loading and unloading a motorcycle. If your storage space is close to ground level and you can ride your motorcycle to the storage space, then have a friend pick you up, no ramps will not be a necessity.
There is no specific collective noun for bicycles, in which case a noun suitable for the situation is used, for example a rack of bicycles, a row of bicycles, a standof bicycles, etc.
Aluminum ramps are for example used to store cars on a truck or to get on a specific hill without damaging your car. Aluminum ramps are also used for people who use a wheelchair.
Bicycles are STILL used.
Someone could purchase an automotive motorcycle at a local motorcycle dealership. There are also ways to obtain used motorcycles such as autotrader or craigslist.
Sell used bicycles.
Usually steel and aluminium alloys, although Titanium may also be used occasionally.
Craigslist is the usual favorite source for used bicycles, but a better solution would be to check with your local bike shop. Many have used bikes for sale, and can also help get less-than-functional ones back to working order.
An inclined plane is commonly used in ramps, sloped driveways, and wheelchair accessibility ramps to help objects or individuals move up or down with less force compared to lifting vertically. Inclined planes are also used in construction, such as when moving heavy materials to higher levels.
A used motorcycle trailer would brought from a used car lot. These can come at a cheap price and a good deal. It would also come in a good condition with a can of oil.
One can purchase a motorcycle for a kid from Amazon where there are many listed for sale. One can also buy them from Motorcycle Superstore or eBay as either new or used.
To reduce unwanted friction.