There are lots of bike shops in makati. You could visit Tryon at JP rizal street in makati. You could talk to Jimmy the owner and he will assist you on your bike needs.
In this bicycle shop directory, you can find a broad selection of local bike shops in each state. Most bicycle stores offer both sales and service; stores that rent bicycles or only sell bicycles are noted as such. Be sure to call ahead before visiting these shops to check their hours of operation, and to verify their location and status. Although we try to keep these listings current, some of the bicycle shops listed herein may have relocated or even ceased operations.
Wondering why there are lockers? Well, one goal of this bike shop is to be a community hub for cyclists and bike commuters. So they offer free bike storage (the place is basically downtown), and also offer showers/soap/lockers for only a $1. Sweet.