Turn your 2 wheel into a trike. Actually it turns your bike into a 4 wheeler. Bolts on and no permanent change to your bike. This unit fits a Harley Ultra classic. If you think your done riding because of balance or age, think again. $3200obo This unit is $5k new, only has few miles. Dad loved this unit and was able to ride a little longer, then got dementia, thats the reason for the sale.