If you're looking for an honest, knowledgeable and courteous bike shop in Sydney to visit, then Inner City Cycles needs to be on your list.
Alex is particularly attentive to the customers needs and wants giving in depth advice on all topics bikes.
Only reason it is not a 5 star is their emails responses can be delayed (4-5 hours), but generally they are on point (better than most).

Expert advice and very friendly and they helped me repair my bike twice for free. Conveniently located near the Sydney CBD.