As nouns the difference between backie and tackie
is that backie is a ride on the back of a bicycle or motorbike while tackie is (south african) a canvas shoe with a rubber sole.
backie
English
Noun
(
en noun)
A ride on the back of a bicycle or motorbike.
References
* Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22a+backie%22+bike&btnG=Search+Books&gws_rd=ssl] tackie
English
Noun
(
en noun)
(South African) A canvas shoe with a rubber sole.
(Ireland, Limerick) Another word for trainers or runners.
(South African slang) A car-tyre or any vehicle’s tyre.
* The hot rod had fat tackies .
Synonyms
* US sneaker, UK plimsoll, Australia sandshoe; tennis shoe