One kind of classic rear bike motor,low noisy,high efficiency.From Chinese manufacturer -- Leaf Motor
Now bldc hub motor because of faultless is used for electric bike widely.
Name: Rear electric hub motor for 20" 24" 26" 700c or 28" electric bike
Model: HBL-Rear Motor (brushless gearless direct current)
Voltage: 36V/48V -- Power: 750W/1000W-- Net Weight: 6.33kg
It can be installed 20" 24" 26" 700c or 28"durable aluminium alloy rim which suits 1.5" to 1.95" tyres.This rear motor can be mounted disk brake that is fit for standard 135mm rear frame fork.
HBL-Rear 36V 750W $115USD
HBL-Rear 48V 1000W $118USD
Review more pictures..
Disconnect hub motor for electric bike