fwiw...
It's very easy to get "sidetracked" into thinking you need an off-road bike for overland travel, but the reality is you need a good STREET bike that is capable of being ridden off-road a bit.
The Trans-Siberian is many thousands of miles of good pavement - with a few hundred of good to fair gravel.
It's been ridden by pure street bikes, even before the road was much improved. Hard then, but very easy now.
Think of two months on pavement on an off-roader, versus a week of good gravel/dirt roads on a street bike, and you'll quickly figure out which way to lean in your choice.
Bikes like the F650GS and KLR are popular overlanding bikes not because of their off-road prowess - they aren't great - but because they can do both adequately.
Bikes like the XR650 are great for crossing the Sahara and going down the west coast of Africa where the roads really are bad, not Russia. If you want to spend a lot of time in Mongolia following the cattle trails, the XR or XL is better, but the KLR will do fine too, and is decent on pavement, with the F650 not quite as good as the KLR off-road, but very much superior on pavement.
Remember that true off-road prowess is hugely compromised by a full load of camping gear, so the speeds and antics you might get up to unloaded are simply not sane when fully loaded - so the advantages off-road of an XR are mostly negated anyway. It's always going to be a smooth steady safe speed you'll ride at anyway, because major crashes are to be avoided at all costs.
Long distance comfort, low weight, easy maintenance, and load carrying ability will win the day for overlanding every time. (think why there isn't any overland gear for the XR, and there is a ton of it for the KLR and F650 and KTM640)
And no I don't think the 950 is suitable for solo long distance travel. The 640 is better. Lighter, cheaper, and easier to ride, and more stuff available for it. 1000cc power is a total waste in the third world - there isn't anywhere it's really sane to use it solo. Two up sure, just as the 1200GS is great for two up, but over the top for solo.
Just my opinion, but I couldn't tell you how many guys tell me that they find that the big bikes are a waste and a pain on long trips.
We all LIKE the big bikes at home, because let's face it, we ride bikes for the power and excitement - but for a long trip in the third world, you'll enjoy it a lot more on something smaller, cheaper, and easier to pick up.
NOTE I also recommend strongly that you ride the same bike as your buddy, or you'll end up with frequent "discussions" about the best speed to travel at etc. Also easier spares, maintenance and tools.
hope that helps...
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com