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Richard Evans has:
http://laidbackaroundtheworld.blogspot.co.uk/
He hasn't posted much about that segment of the route but talked quite a lot about Kazakhstan in particular when he did a slide show at Bikefix the other day. Fabulous hospitality, apparently (but most likely very difficult for a vegetarian, from what I could gather).
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I went to Tajikistan in 2013. Bike got held up in Istanbul for 5 days which screwed up my planning (and budget) a bit but other than that I had a great time. Took a jeep to Khorog and spent about 10 days doing a loop around the area. Also had a few days of riding along the Afghan border without the bags which was a lot of fun. The locals showed nothing but great hospitality, generosity and curiosity. Food was usually home made yoghurt, bread and chai. For dinner oily rice mixed up with vegetables. Don't think I was ever served meat other than on restaurants actually. Longing to go back. Kyrgyzstan seems lovely. Maybe next year.
Has anyone been to central Asia on a bike? Kazakhstan, Kyrgyzstan, Tajikistan etc?