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The Tricycle is or should i say was made by Trek. Sadly Trek no longer manufacturers this most excellent Full-Size all ages Tricycle or "Big Wheel". Few are still out there for sale, but with luck you my find a few floating around on EBay.
medium.
Wheels should the rotation based on size and the smaller one shows more rotation if the same distance is traveled. Front and back wheels that are the same size show the same rotation, while the larger front wheel on a tricycle may only move half the rotation that the smaller back ones do.
The best size is the size it was built with, which is listed on a label on the driver side door jamb.
If you have a bike with direct drive, like the old penny farthings and a kids tricycle, then the size of the drive wheel will seriously limit the speed you can get. But with a chain drive you can also introduce a gear ratio, allowing the drive wheel to spin faster than the pedals, making it possible to go faster.
The wheel size does affect its speed.
Adult what?
stock size for this vehicle is 235 75/r15 on a 15x7 wheel.
take it to the cleaners and tell them to shrink them
An adult Birman is not large in size; the typical size is 6 to 12 pounds.
As the size of the wheel increases the necessary force needed to pull the wheel decreases
The original wheel size is 15"