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Please help where i can buy it, im from philippines. This cogs is from " Joytech cassette", its really hard to find here in philippines.
Please help or donate some parts

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Click on contact us and ask for the nearest dealer or mail order.
http://www.joy-tech.com.tw/
they tell me that if i order, we need buy another set of it.
All i need is a cogs only 13T or 15T
i googled "Philippines bmx distribution" and found this. http://www.flipbykes.com/
give 'em a call, tell 'em what you need, and ask 'em to ship it to you. i dont know if they still do, but Odyssey used to make cogs for 2 pc cassettes. these guys sell odyssey so they might be able to help you
That is shimano spacing for the cogs. See if your local MTB shop has a SHIMANO cog. OR any brand that fits SHIMANO.
"Hey anybody ever make that mistake like right when you wake up in the morning and you believe in yourself?" -Kyle Kinane
"BIKES!" -Tom Segura