A high wheel safety is a adult sized bicycle (reach of leg) that has a smaller front wheel diameter bringing the rider closer and safer to the ground and easy to mount and dismount.
The classic high wheel bicycle was direct crank/pedal driven to the large front wheel axle and a rider rode the largest wheel he could reach which put him up in the air and he covered a lot of ground for each wheel/pedal rotation. The smaller rear trailing wheel was purely for fore and aft support of the rider.
High wheel safeties lowered the rider and some of them sped up the driven wheel from each crank/pedal rotation like on the KANGAROO where two different sized sprockets were linked by a chain to the front wheel. A predecessor of the rear wheel chain driven hard tire safety bicycle.
A deviation with a large rear driven wheel is the EAGLE and the large rear wheel driven lever and coiled leather belts STAR with both models making headers over the handle bars almost impossible and both having small front steerable wheels. The EAGLE would inherently want to do "wheelies" so riding style had to be adapted to it. The STAR using levers pushed the riders leg driving force downward between the small front wheel and larger rear wheel keeping it from doing "wheelies". Down hills were less intimidating since you had the little wheel in front of you.
Smaller (48" diameter or less) front wheel driven high wheel safeties used lever and linkages linked to front wheel axle (FACILE, G&J, SINGER XTRAORDINARY, etc), chain and sprocket drives linked to front wheel axle (KING, KANGAROO, and OTHER VARIATIONS) also existed.
The term "Dwarf" means a smaller adult sized version and is sometimes used to describe a high wheel safety as well.
From all of this, the hard tire safety with solid rubber wired on tires (like the high wheels) was born with the rider now positioned between roughly the same diameter wheels with cranks and pedals turning chain drive sprockets to gear up the rear wheel to equal that of the distance traveled by one rotation of a high whee bicycle. This is why modern bicycles are referred to as geared to a certain size wheel referring back to high wheel times.
Next big improvement was cushion tires (larger cross section and softer rubber or arched hollow tires glued to the inner sides of the rims as on a VICTOR) and then the pneumatic tire starting in 1892 on wood or metal rims.
I would highly recommend the book sold by Scott McCaskey right here on the CABE which is COLLECTING AND RESTORING ANTIQUE BICYCLES by G. DONALD ADAMS which will educate you on the progression of the bicycle. I have referred to this book for decades and is a wealth of knowledge.
Mike Cates, CA.
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