Spare parts in Bishkek, Kyrgyzstan
I found a shop in Bishkek where you can find many spare parts you don't expect to find in central Asia, like Motul engine oil, Continental TKC 80 tires even in 21'' size, Uvex helmets, Axo knee guards, gloves, hand guards, windscreens, mirrors and many more! Although, if you are planning your trip, don't rely on the availability of those products. If you want to buy the tires, be sure he will have them when you will arrive in Bishkek.
It is in Kudaibergen rinak (market). It's a mass of containers which have turned to shops. It's the shop number 29E. The man is called Dima and you can call him on 00996 312 543 91 58 19 but he speaks only Russian. Almost every motorcyclist in the city (there are not many!) knows him as "Dima biker".
You must ride along Chuy prospektisi (avenue) towards west. If you start from the center of the city, that means you will pass in front of Osh bazaar on your left. You must continue west on Chuy and after 2-3 kms you must turn right. Ask around about Kudaibergen to find the turn.
Hope it helps!