Hi sifus....am wondering if anyone can recommend a bicycle shop or wherever that I can change the tube in the tyre? Have 1 Java Fit and 1 Oyama bike (not sure what models they are), seems the tyre size is about 18~20 inches. Bought them from Pedalspot many years ago, called them up but they said they don't stock up for tyres this size anymore. Location in KL. Thanks!