Old MTB in need of a new chain - help?

celestialteapot
celestialteapot Posts: 2
edited August 2015 in MTB beginners
Hi,

My mountain bike is pushing 15yrs old. It wasn't serviced that long ago so the brakes & gears are in pretty good order, but I think I need to replace the chain. The problem is, my bike has 15 speed SIS gears and apparently this is obsolete so I don't really know what chain I need to buy.

My rear derailleur has a 5-speed cassette and my front derailleur a 3-speed cassette.

Any advice much appreciated :)

(here's a photo of my elderly bike - http://i.imgur.com/ktYGHfn.jpg)

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